HomeMy WebLinkAbout08052004 BSC Agenda Item 7 RECOMMENDED SCOPE OF GEOTECHNICAL ENGINEERING SERVICES FOR THE
r CITY OF WEST UNIVERSITY
MAY 2004
By David Eastwood,P.E.
Updated 07-27-04
Foundations
Foundations for residences in the City of West University will consist of either a structural slab or slab-
on-fill type foundation systems. The structural slab foundation system may consist of a pier and beam
with a crawl space or slab with void underneath it and supported on piers. In all cases, piers will be used
to support the superstructure.
Geotechnical Exploration
The geotechnical exploration for residences in West University should be conducted by an accredited
geotechnical engineering firm. The firm should be accredited by American Association of Laboratory
Accreditation (A2LA) in geotechnical engineering. The accreditation should be current. A copy of
the accreditation in geotechnical engineering should be placed as an appendix of the report. The firm
should have a minimum of$500,000 errors and omissions insurance (professional liability insurance).
Geotechnical Borings
There shall be a minimum of two borings required for houses with slabs of up to about 3,000 sq. ft.
Additional borings should be conducted for any additional 1500 sq. ft. of the floor slab areas. This
includes the garage area as well. All borings will be a minimum of 25-ft deep. However, 20-ft borings
are allowed if a portable rig has to be used.
The geotechnical borings for additions to an existing residence will consist of one boring for additions of
1000 sq. ft. or less. Additions greater than 1000 sq. ft. will require two borings. The boring depth will
be the same as above.
Laboratory Testing
The laboratory testing will be determined by the geotechnical engineer. Some of these tests shall
include Atterberg limits, unconfined compression, torvane, hand penetrometer, soil suction, grain size
analyses, etc. Minimum testing will be as follows:
Minimum Number
Test Type ASTM Standard of Tests per Boring
Moisture Content ASTM D-2216 4
Atterberg Limits ASTM D-4318 2
Torvane ---- 5
Hand Penetrometer ---- 5
Unconfined Compression ASTM D-2166 2
Swell Tests ASTM D4546 As needed
Suction ASTM 5298 As needed
Sieve Analysis ASTM D-422 As needed
r
Engineering Report
The geotechnical engineering report should include recommendations on the recommended foundation
types. In addition, the report should discuss various foundation risks. The recommended pier depths
should be specifically spelled out. Furthermore, the recommended fill thickness should clearly be
presented. In addition, on sites where trees are present, the effected tree removal and/or dying needs to
be considered in the evaluation of the recommended foundation system and its components.
Furthermore, a picture of the site should be presented in the geotechnical report. In general, the
geotechnical report should include the following:
o Introduction.
o Field Exploration Procedures.
o Laboratory testing.
o Site conditions.
o Soil Stratigraphy.
o Groundwater.
o Foundations and Risks.
o Foundation Types, depth and allowable by pressures. This includes structural slab supported on
piers, slab-on-fill supported on piers, floating slab recommendations.
o Estimated settlements and potential vertical rise (PVR).
o Construction considerations, including earthwork and testing requirements.
o Vegetation control, including the effects of existing trees, tree removal,tree dying and new trees.
o Site drainage.
o Use of on-site soils for fill.
o Limitations.
o Site plan
o Boring logs, including the depth of root fibers.
o Homeowner maintenance program.
o Project site pictures.
The geotechnical report should also include a copy of the A2LA Accreditation certificate in
geotechnical engineering and a copy of errors and omissions insurance certificate.
Quality Control and Testing
The quality control and testing during construction for a residence should be conducted by the same firm
that conducted the initial geotechnical report. This work will include earthwork testing, drilled footing
observations, and concrete testing. The subgrade soils should be proofrolled and compacted to 95
percent maximum dry density degree by ASTM D698 at moisture content with optimum and+3 percent.
All fill soils placed underneath the floor slabs should consist of structural fill with liquid limit less than
40 and plasticity index between 12 and 20. These soils should be compacted to a minimum of 95%
maximum dry density (ASTM D698). Moisture contents between optimum and +3%. All the fill soils
should be tested, at a minimum of five locations within the floor slab areas at each eight-inch lifts. The
subgrade soils should be proofrolled and tested for density at five locations prior to fill placement. The
subgrade soils should have the same level of compaction as the fill soils. This information should be
provided at the completion to the client, the city building official as well as the structural engineer. The
construction of all the piers should be observed by the geotechnical engineer of the record or the
structural engineer of the record. The piers should be check for proper depth, soils stratum, proper soil
strength, the correct bell size and steel placement, steel size and grade.
The concrete for the drilled footings slab should be tested in compression. A minimum of four concrete
cylinders should be made for every 50 yards of pour or portions of. Two of the cylinders will be broken
at 7 days and two at 28 days.
Submittals
A copy of the geotechnical report together with all field testing and observations should be sent to the
structural engineer of the record, the client, as well as the building official. All failed tests should be
retested until passing results are achieved. The reports should include the following:
o Initial geotechnical report
o Proofrolling observations report of subgrade
o Proctor test reports
o Subgrade density reports
o Fill compaction reports per all lifts
o Drilled footing installation report
o Concrete compression test reports for the drilled footing and the slab
o A2LA Accreditation certificates in geotechnical engineering
o A2LA Accreditation certificates in materials engineering
o Errors and omission insurance certificates for a minimum of$500,000 annual claims made.
All reports should be signed and sealed by a licensed professional engineer in the State of Texas. The
laboratory conducting the testing should be accredited by the American Association of Laboratory
Accreditation (A2LA) in Construction Materials Testing. A copy of the accreditation certificate
should accompany the submittals.
Word\marketing\westuniversity
RE: Draft West U Foundation Ordinance Page 1 of 3
B. B. Slimp
From: Ron Kelm [RonKelm @ForensicEng.com]
Sent: Monday, July 26, 2004 2:39 PM
To: S. S. Slimp
Subject: RE: Draft West U Foundation Ordinance
Dear Bryant,
At your request, I attended your meeting on 1 July 2004. As since requested, I summarized the changes I
recommended to the proposed ordinance you discussed during that meeting. Attached are my proposed
changes in both Word and Acrobat formats. Notice under 3.h.1, I have a question for you on whether
you specify somewhere in your ordinances what design life is required of residential structures in West
U. .
As I stated in your 1 July meeting, you will not be able to limit movement of the soil to 1". It is
theoretically possible to limit movement of the foundation(not the soil)to 1", but you will no longer be
able to allow slab on grade foundations in your city, only slab s on deep footings. I will be happy to
provide you further details on this if needed.
You also requested I provide a source and cost of obtaining a soil report in accordance with Document
No. FPA-SC-04-0. Three years ago I asked several local geotechnical engineers to estimate the cost for
doing a geotechnical investigation in accordance with this document. I no longer have the estimates but
seem to remember it costing about $4000 for single family custom homes like yours. I remember that
both Geotech Engineering and Henderson Engineering said they could provide services using this
document. Geotech has provided these services to me since then, however it was a forensic job and out
of town.
I did recently have a Dallas geotechnical engineer(Bryant Consultants)provide the services for a new
home design in Houston and have asked and obtained permission from them and the homeowner to send
you their soil report. This attached report follows the FPA-SC-04-0 document but also provides
additional information that I feel is necessary today, and which is included in my attached comments in
section 3.b.4 and 3.b.5. Note that their report also has other information provided including an external
benchmark and geophysical testing (i.e., GMMIR). I do not feel these are necessary in all cases and
should therefore not be part of your requirements.
The cost for Bryant Consultants to duplicate the services in their report on a house by house basis in
your city is between $3750 and$4000. This estimate from them does not include mobilization fees from
Dallas nor the extra geophysical testing and benchmark. Thus it gives you a real cost of locally
obtaining geotechnical information in accordance with FPA-SC-04 but with my additional criteria of
deeper borings and a aerial photo. If you bear higher estimates, it may be because some of them have to
finance suction equipment and swell test equipment that they do not already own. This equipment can be
purchased for about $4000 to $8000.
I applaud you for taking these honorable steps to make the foundation design and construction industry
do the work we need to do so we can mitigate foundation problems in West U. I know you will have to
withstand criticism from those wishing to keep the status quo. Thank you for standing up to this
criticism and for taking this giant step to serve the public and preserve their welfare. I and other
structural engineers appreciate your time and dedication to help us get the information we need in order
7/26/2004
RE: Draft West U Foundation Ordinance Page 2 of 3
to do a proper job in design foundations.
If you would like me to attend a future workshop on this subject, please send me an email. I do not think
your city's website shows your meeting schedule and I am unable to come by regularly to view the
physical posting you may have outside city hall.
Best Regards,
Ron Kelm,P.E.
Forensic Engineers Inc.
9930 Shadow Wood Dr. Houston, Texas 77080-7110 USA
T: 713-468-8100 F: 713-468-8184 E: ronkelm @forensiceng.com
From: "B. B. Slimp" <bbslimp @swbell.net>
To: "Ron Kelm" <ronkelm @forensiceng.com>
Subject: Draft West U Foundation Ordinance
Date: Thu, 1 Jul 2004 08:23:07-0500
X-Priority: 3 (Normal)Importance: Normal
X-Loop-Detect:l
Status:
RON- - -
This is the latest draft of the revisions to the foundation sections of the
Standard Code that we are considering for West University in the Building
Standards Commission. It is the topic of my phone messages to you.
I would appreciate your comments on these as a structural engineer.
Please feel free to call me at the numbers below.
We are having a BSC meeting tonight at 6:00 PM in the Watson conference room
(across the hall from the City Council chambers in the West U City Hall) if
you would like to come.
We will be discussing these revisions as an agenda item, and I welcome your
comments there if you would like to attend.
If you can not attend, I would like to meet you in person or via phone at a
time that would be convenient to you to obtain your comments on this draft
ordinance.
Regards,
Bryant Slimp(BSC Chair )
Office: 713 / 839 - 9910
Fax: 713 / 839 - 9920
Cell: 713 / 725 - 7805
Pager: 713 / 602 - 4758
7/26/2004
1 - RE: Draft West LT Foundation Ordinance Page 3 of 3
•
Attachment converted: 17" PB-80:54 o foundation 6-28-04.pdf(PDF /CARO) (001B8FF7)
1
7/26/2004
Comments by Ron Kelm, P.E. 26July 2004 Page 1 of 16
Comments to West tiniversity Ordinance Proposed by Building Standards Commission
and Discussed at 1 July 04 Meeting
3. All foundations for new buildings (or additions to existing buildings) with a gross floor
area 485 square feet or more must meet the following criteria, as applicable.
a. Engineering. Foundations must be constructed in accordance with complete plans
and specifications prepared, signed and sealed by an licensed or registered professional
engineer who is currently licensed by the Texas Board of Professional Engineers and
who is:
i r - (1) employed by a r _istered engineering firm currently registered by the Texas
Board of Professional Engineers and
(2) covered by professional liability (errors and omissions)insurance with limits
of a least $500,000 per year, aggregate ("RLPE").
The plans and specifications must be prepared specifically for the site of the work, and
they must meet criteria as to scope, content and form specified by the building official.
b. Geotechnical Report. The plans and specifications for each foundation must be based
on a written geotechnical report prepared, signed and sealed by an engineer who is
currently licensed by the Texas Board of Professional Engineers and who is:a licensed
b . _ . engineer-who-is'..
(1) employed by a engineering firm currently registered by the Texas Board of
Professional Engineers and- . . . . -- ; .
(2)covered by professional liability(errors and omissions)errors and omissions
insurance with limits of at least$500,000 per year, aggregate.
The site investigation, testing and report must meet all applicable criteria in
"Recommended Practice for Geotechnical Explorations and Reports" published by the
Structural Committee of the Foundation Performance Association,Houston, Texas
(Document# FPA-SC- 04-0,Rev#0, 11 April 2001, issued for website publishing), a
copy of which is on file in the City Secretary's office. However, the following
additional criteria shall also be met:
(3) The minimum depth of all borings is 20 feet in all cases.
(4) At least one boring shall be 35 feet deep if the foundation is to be supported
below existing grade at a depth of 6 feet or greater.
(5) The report shall include a recent aerial photo that shows prior land use and
the location of the proposed foundation
(6) The validity of the report shall be as specified in the geotechnical report but
no more than 6 months. If the foundation construction is to begin after this
validity period, sealed certification letters are required by both the
geotechnical engineer of record and the foundation design engineer of
record that the report recommendations and design are either still applicable
or else new designs are to be submitted.
• (71 All tests and other laboratory work must be performed by a laboratory
accredited for such work by the American Association for Laboratory
Accreditation on the basis of ISO/lEC 17025:1999 ("general requirements
Comments by Ron Kelm, RE. 26July 2004 Page 2 of 25
for the competence of testing and calibration laboratories").
(8) The potential vertical movement of the soil, both up and down, shall be
estimated for both normal (expected) and extreme(boundary) conditions,
using at least two of the following methods:
c. Foundation Performance Standard The plans and sped -
mast-be-prepared-te-aehent-potentiatotione-ineli-: - , - - -
by-the-estimat-ed-d ; . - :ne in combination with at least two of the.
• b
(i4.)Potential vertical rise (PVR)determined in accordance with Test
Method Tex-124-E, Rev. January 1, 1978/December 1982, Texas State
Department of Highways and Public Transportation, Materials and Test
Division, "Method for Determining the Potential Vertical Rise,PVR"(a
copy of which is on file in the office of the City Secretary). For this
purpose,the "dry" moisture condition(from which little shrinkage is
experienced, but where volumetric swell potential is greatest) shall be
used for each sample and test.
(ii2) Swell tests performed in accordance with ASTM D4546-03,
"Standard Test Methods for One-Dimensional Swell or Settlement
Potential of Cohesive Soils" as last revised prior to June 1, 2004.
(ilia) Suction and hydrometer swell tests performed in accordance with
ASTM D5298-03 "Standard Test Method for Measurement of Soil
Potential (Suction)Using Filter Paper"and ASTM D6836-02 "Standard
Test Methods for Determination of the Soil Water Characteristic Curve
for Desorption Using a Hanging Column, Pressure Extractor, Chilled
Mirror Hygrometer, and/or Centrifuge," as such methods were last
revised prior to June 1,2004.
c. Foundation Drawinks. The foundation design engineer of record shall show on the
design plans and specifications:
(1) The Geotechnical Report number, report date, and date of the site
exploration
(2) The estimated depth of the active zone, i.e., the depth of zero movement
(3) The weighted plasticity index of the upper 15 ft of soil computed in
accordance with B.R.A.B. #33
(4) The maximum differential movement(as measured with a level)the
foundation design can withstand in centerlift and edgelift conditions as
defined by the Post-Tensioning Institute in their latest edition of"Design
and Construction of Post-Tensioned Slab-On-Ground," whether the
foundation is founded at grade or at depth and independent of the type of
reinforcing used in the design.
d. Foundations, Basic Type. Each foundation must be of an approved basic type.
Approved basic types are listed below. In this list,types of foundations are defined and
described in "Foundation Design Options For Residential and Other Low-Rise
Buildings on Expansive Soils"published by the Structural Committee of the
Foundation Performance Association, Houston, Texas (Document# FPA-SC--01-0X,
Comments by Ron Kelm, P.E. 26July 2004 Page 3 of 35
Rev#0X l30 June 2004, issued for FPA peer revie-wwebsite publishing), a copy
of which is on file in the City Secretary's office.
(1) Structural slab with void space and deep foundations.
(2) Structural floor with crawl space and deep foundations.
(3) Stiffened structural slab with deep foundations.
(4) Stiffened non-structural slab with deep foundations.
(5) Grade-supported stiffened structural slab.
(6)Grade-supported stiffened non-structural slab.
(7)Grade-supported non-stiffened slab of uniform thickness (approved one-
story buildings--or additions to buildings--containing only storage space, not
living space).
(8)Mixed-depth system for all new building construction.
(9)Mixed-depth system for building additions with deep foundations.
(10)Mixed-depth system for building addition with shallow foundations.
(11)Another type approved by special exception issued by the BSC. below.
e. Foundations, Deep Support Components. Deep support components must be of an
approved type. Approved types are listed below. In this list, types support components
are defined and described in"Foundation Design Residential and Other Low-Rise
Buildings on Expansive Soils"published by the Structural Committee of the
Foundation Performance Association, Texas (Document# FPA-SC-01-0X,Rev#0X,
30 June-I--April 2004, issued for reviewwebsite publishing), a copy of which is on file in
the City Secretary's office.
(1)Drilled and underrearned concrete piers.
(2)Drilled straight-shaft concrete piers.
(3)Auger-cast concrete piles.
(4)Another type approved by special exception issued by the BSC. below.
f Foundations, reinforcement. Reinforcement for each foundation must of an approved
type. Approved types are listed below. In this list, types reinforcement are defined and
described in "Foundation Design Options Residential and Other Low-Rise Buildings on
Expansive Soils"published Structural Committee of the Foundation Performance
Association, Texas (Document# FPA-SC-01 X0,Rev#0X, 1 April30 June 2004,
issued for review), a copy of which is on file in the City Secretary's office.
(1)Deformed bar reinforcing.
(2) Welded wire fabric reinforcing(approved for one-story buildings--additions
to buildings--containing only garage or storage space).
(3)Another type approved by special exception issued by the BSC. below.
g. Foundations, Observation & Certification. Each foundation must be
professionally observed and must be certified by an.RLPE, as more described below:
(1) Observations must:
(1) be performed either by the certifying RLPE or by--a that RLPE's
direct supervision and control whose professional qualifications
are approved by the RLPE,
Comments by Ron Kelm, P.E. 26July 2004 Page 4 of 45
i
(ii) include actual measurement of pier holes, fill, compaction,
reinforcement, forms, materials, dimensions, structural elements,
stressing, tendons,tensions, attachments, etc. before the work is
covered or concrete is placed,
(iii) be performed continuously during placement of concrete and any
stressing or tensioning operations, and
(iv) be documented in a form and manner approved by the building
official (which may include photographs).
(2)Certifications must:
(i) refer to and be based upon the professional observations required
by this section,
(ii) state that the work complies with the plans and specifications last
approved by the building official (with any field changes that are
ordered by the RLPE and reported to the building official and
that comply with applicable regulations),
(iii) state that the work complies with sound engineering practices,
(iv) comply with criteria as to form and content as may be specified
by the building official,
(v) be signed and sealed by the certifying RLPE, and
(vi) be filed with the building official.
Before framing or other work commences atop a foundation(and before the
foundation is otherwise covered), the permittee must obtain written
acknowledgment from the Building official that the certification for the
foundation was duly filed as required above.
h. The BSC may issue a special exception from any requirement in subsection"a"
through"g,"above, but only upon a showing that:
(1) the requirement will not affect life safety or the performance of a
structure (for its estimated useful life HOW MANY YEARS IS THIS?
`:HERE IS fr DEFINED OR'SPECIFLEO? ); or
(2) an alternate requirement to be imposed by the special exception will
provide equal or better protection for life safety and long-term structural
performance.
In connection with any such special exception,the BSC may require that the
applicant provide supporting engineering data and opinion, and the BSC may
impose conditions to carry out the purpose and intent of applicable regulations.
4. All concrete piers, footings and foundations must be cured for at least 72 hours before any
significant load is placed on them.
5. All walls and ceilings .....
Comments by Ron Kelm, P.E. 26July 2004 Page 5 of 55
Respectfully submitted by:
Ron Kelm, P.E. # 44898, State of Texas
FORENSIC ENGINEERS INC.
9930 Shadow Wood Dr.
Houston TX 77080
W: 713-468-8100
F: 713-468-8184
C: 713-443-6323
E: ronIcelm brensiceng.com
•
Rev. 6-28-04
Standard Codes Schedule
Adoption. Subject to the amendments and deletions indicated beneath each code, each of the following codes,
including all of its published appendices and attachments, is adopted, ordained and made a part of the Code of
Ordinances of the City and of each chapter where it is referenced, except as otherwise expressly provided.
Procedure for amendments, etc. The procedure for adopting new codes, updated codes, local amendments and
provisions for administration and enforcement of these codes is as follows: (1)proposal by the building official
or other appropriate City official, (2)referral to the Building&Standards Commission, (3)consideration by the
City Council, after giving required meeting notices, and(4) adoption and publication, as required by Article II of
the City Charter.
International Building Code, 2000 Ed.,International Code Council, Inc..
1. The administrative officer is the building official. All hearings, variances etc. are handled
by the BSC.
2. All roofs must have Class C or better fire resistance, as determined under Sec. 1505.1.
•
3. - : • 6: • - • - • : • .• •• • .• ; ,. ;
professional engineer("RPB"), and the work shall bc:
•
less than 450 sq. ft. of gross flotyrarea);-and
furthcr-
All foundations for new buildings (or additions to existing buildings) with a
gross floor area 485 square feet or more must meet the following criteria, as
applicable.
a. Engineering. Foundations must be constructed in accordance with
complete plans and specifications prepared, signed and sealed by a
licensed or registered professional engineer who is:
(1) employed by a registered engineering firm and
(2) covered by professional errors and omissions insurance with
limits of at least $500,000 per year, aggregate ("RLPE").
The plans and specifications must be prepared specifically for the site
1 of the work, and they must meet criteria as to scope, content and form
3
specified by the building official.
b. Geotechnical Report. The plans and specifications for each
foundation must be based on a written geotechnical report prepared,
signed and sealed by a licensed or registered geotechnical engineer
who is:
(1) employed by a registered engineering firm; and
(2) covered by professional errors and omissions insurance with
limits of at least $500,000 per year, aggregate.
The report must meet all applicable criteria in "Recommended
Practice for Geotechnical Explorations and Reports" published by the
Structural Committee of the Foundation Performance Association,
Houston, Texas (Document # FPA-SC-04-0, Rev #0, 11 April 2001,
issued for website publishing), a copy of which is on file in the City
Secretary's office. However, the minimum depth of borings is 20 feet
in all cases. All tests and other laboratory work must be performed
by a laboratory accredited for such work by the American Association
for Laboratory Accreditation on the basis of ISO/IEC 17025:1999
("general requirements for the competence of testing and calibration
laboratories").
c. Foundation Performance Standard. The plans and specifications for
each foundation must be prepared to achieve a soil movement
potential of one inch or less, determined by the estimated depth of the
active zone in combination with at least two of the following
methods:
(1) Potential vertical rise (PVR) determined in accordance with
Test Method Tex-124-E, Rev. January 1, 1978/December 1982,
Texas State Department of Highways and Public
Transportation, Materials and Test Division, "Method for
Determining the Potential Vertical Rise, PVR" (a copy of
which is on file in the office of the City Secretary). For this
purpose, the "dry" moisture condition (from which little
shrinkage is experienced, but where volumetric swell potential
is greatest) shall be used for each sample and test.
(2) Swell tests performed in accordance with ASTM D4546-03,
"Standard Test Methods for One-Dimensional Swell or
Settlement Potential of Cohesive Soils" as last revised prior to
June 1, 2004.
(3) Suction and hydrometer swell tests performed in accordance
with ASTM D5298-03 "Standard Test Method for
Measurement of Soil Potential (Suction) Using Filter Paper"
and ASTM D6836-02 "Standard Test Methods for
Determination of the Soil Water Characteristic Curve for
Desorption Using a Hanging Column, Pressure Extractor,
Chilled Mirror Hygrometer, and/or Centrifuge," as such
methods were last revised prior to June 1, 2004.
d. Foundations, Basic Type. Each foundation must be of an approved
basic type. Approved basic types are listed below. In this list, types
of foundations are defined and described in "Foundation Design
Options For Residential and Other Low-Rise Buildings on Expansive
Soils" published by the Structural Committee of the Foundation
Performance Association, Houston, Texas (Document # FPA-SC-01-
X, Rev #X, 1 April 2004, issued for FPA peer review), a copy of
which is on file in the City Secretary's office.
(1) Structural slab with void space and deep foundations.
(2) Structural floor with crawl space and deep foundations.
3 Stiffened structural slab with deep foundations.
(4) Stiffened non-structural slab with deep foundations.
(5) Grade-supported stiffened structural slab.
(6) Grade-supported stiffened non-structural slab.
(7) Grade-supported non-stiffened slab of uniform thickness
(approved for one-story buildings--or additions to buildings--
containing only garage or storage space, not living space).
(8) Mixed-depth system for all new building construction.
(9) Mixed-depth system for building additions with deep
foundations.
(10) Mixed-depth system for building addition with shallow
foundations.
(11) Another type approved by special exception issued by the BSC.
See (h), below.
e. Foundations, Deep Support Components. Deep support components
must be of an approved type. Approved types are listed below. In
this list, types of deep support components are defined and described
in "Foundation Design Options For Residential and Other Low-Rise
Buildings on Expansive Soils" published by the Structural Committee
of the Foundation Performance Association, Houston, Texas
(Document # FPA-SC-01-X, Rev #X, 1 April 2004, issued for FPA
peer review), a copy of which is on file in the City Secretary's office.
(1) Drilled and underreamed concrete piers.
(2) Drilled straight-shaft concrete piers.
(3) Auger-cast concrete piles.
(4) Another type approved by special exception issued by the BSC.
See (h), below.
f. Foundations, reinforcement. Reinforcement for each foundation
must be of an approved type. Approved types are listed below. In
this list, types of reinforcement are defined and described in
"Foundation Design Options For Residential and Other Low-Rise
Buildings on Expansive Soils" published by the Structural Committee
of the Foundation Performance Association, Houston, Texas
(Document # FPA-SC-01-X, Rev #X, 1 April 2004, issued for FPA
peer review), a copy of which is on file in the City Secretary's office.
(1) Deformed bar reinforcing.
(2) Welded wire fabric reinforcing (approved for one-story
buildings--or additions to buildings--containing only garage or
1 storage space, not living space).
(3) Another type approved by special exception issued by the BSC.
See (h), below.
g. Foundations, Observation & Certification. Each foundation must be
professionally observed and must be certified by an RLPE, as more
fully described below:
(1) Observations must:
(i) be performed either by the certifying RLPE or by a
person under that RLPE's direct supervision and control
whose professional qualifications are approved by the
RLPE,
(ii) include actual measurement of piers, fill, compaction,
reinforcement, forms, materials, dimensions, structural
elements, stressing, tendons, tensions, attachments, etc.
before the work is covered or concrete is placed,
(iii) be performed continuously during placement of concrete
and any stressing or tensioning operations, and
(iv) be documented in a form and manner approved by the
building official (which may include photographs).
(2) Certifications must:
(i) refer to and be based upon the professional observations
required by this section,
(ii) state that the work complies with the plans and
specifications last approved by the building official (with
any field changes that are ordered by the RLPE and
reported to the building official and that comply with
applicable regulations),
(iii) state that the work complies with sound engineering
practices,
(iv) comply with criteria as to form and content as may be
specified by the building official,
(v) be signed and sealed by the certifying RLPE, and
(vi) be filed with the building official.
Before framing or other work commences atop a foundation (and
before the foundation is otherwise covered), the permittee must obtain
written acknowledgment from the Building official that the
certification for the foundation was duly filed as required above.
h. The BSC may issue a special exception from any requirement
in subsection "a" through "g," above, but only upon a showing
that:
(1) the requirement will not affect life safety or the
performance of a structure (for its estimated useful life);
or
(2) an alternate requirement to be imposed by the special
exception will provide equal or better protection for life
safety and long-term structural performance.
In connection with any such special exception, the BSC may
require that the applicant provide supporting engineering data
and opinion, and the BSC may impose conditions to carry out
the purpose and intent of applicable regulations.
4. All concrete piers, footings and foundations must be cured for at least 72 hours before any
significant load is placed on them.
5. All walls and ceilings within a R-1, R-2, R-3 and R-4 type occupancy shall be sheathed
is
with Type X gypsum board at least 5/8-inch(15.9 mm)thick. Exception: Where this
code (IBC)requires otherwise for moisture protection.
6. Delete: Appendices A (Employee Qualifications), B (Board of Appeals) and D (Fire
Districts).
International Energy Conservation Code, as it existed on May 1, 2001, International Code
Council,Inc.
1. The administrative officer is the building official. All hearings, variances etc. are handled
by the BSC.
2. In lieu of inspection by City employees, the building official may require a written
certification that a building meets or exceeds minimum requirements, if the certification
is: (i) signed by a code-certified inspector(as defined in Section 388.02, TEX. HEALTH
& SAFETY CODE) not employed by the city, and (ii) accompanied by an approved
inspection checklist, properly completed, signed and dated by the inspector. If the fees of
the code-certified inspector are paid by the City, the amount shall be added to the building
permit fees otherwise payable. With approval from the building official, a permittee may
pay such fees directly to an independent inspection firm. Only code-certified inspectors
may perform inspections and enforce this code in the City.
International Fire Code,2000 Ed., International Code Council, Inc.
1. The fire official shall be the fire chief or acting fire chief; who may detail other members
of the fire department or the building inspection division to act as inspectors. Chapter 6
of this Code shall apply to enforcement and administration of the fire code in the same
manner as it applies to the building code(except that the fire official shall have the
powers and duties of the building official under such articles).
2. The BSC shall have the same jurisdiction and authority with respect to the fire code as it
has with respect to the building code.
3. The limits of the fire district referred to in Section 902.1.1 are coextensive with the City
limits.
4. Explosives and fireworks, as defined in Chapter 33, are prohibited within the City limits.
5. Notwithstanding Section 2206.7.6 (relating to service stations), "latch-open"type devices
are prohibited.
6. Section 603.8.4 (hours for burning) is amended to read in its entirety as follows: "An
incinerator shall not be used or allowed to remain with any combustion inside it: (i) at any
time from an hour preceding sunset on one day until sunrise the following day; or(ii) at
any time when unattended."
(7) Delete: Appendices FA (Board of Appeals), FE (Hazard Categories), FF (Hazard
Ranking) and FG (Cryogenic Fluids - Weight and Volume Equivalents).
International Fuel Gas Code, 2000 Ed., International Code Council, Inc.
1. The administrative officer is the building official. Chapter 6 of this Code shall apply to
enforcement and administration of this code in the same manner as it applies to the
building code. The BSC shall have the same jurisdiction and authority with respect to
this code as it has with respect to the building code.
2. Delete Sections FG 103, FG 106 and FG 10.
Rev. 8-5-04
Standard Codes Schedule
Adoption. Subject to the amendments and deletions indicated beneath each code, each of the following codes,
including all of its published appendices and attachments, is adopted,ordained and made a part of the Code of
Ordinances of the City and of each chapter where it is referenced, except as otherwise expressly provided.
Procedure for amendments,etc. The procedure for adopting new codes,updated codes, local amendments and
provisions for administration and enforcement of these codes is as follows: (1)proposal by the building official
or other appropriate City official, (2)referral to the Building&Standards Commission, (3)consideration by the
City Council, after giving required meeting notices, and(4)adoption and publication,as required by Article II of
the City Charter.
International Building Code,2000 Ed., International Code Council, Inc..
1. The administrative officer is the building official. All hearings,variances etc. are handled
by the BSC.
2. All roofs must have Class C or better fire resistance, as determined under Sec. 1505.1.
professional engineer("RPE"), and the work shall bc:
' • I . . . eV •_
b: .• : . • .: : • . • . • . .. • • - .
(Exception: no soils report is required fora single story accessory building with
further.
3. All foundations for new buildings (or additions to existing buildings)with more than one
story, or with a gross floor area of 485 square feet or more, must meet the criteria in this
section, as applicable. In this section:
"RLPE"means a licensed or registered professional engineer who is:
(1) employed by a registered engineering firm and
(2) covered by professional errors and omissions insurance with limits
of at least$500,000 per year, aggregate; and
"RLGE"means a licensed or registered geotechnical engineer who is:
(1) employed by a registered engineering firm; and
(2) covered by professional errors and omissions insurance with limits
of at least$500,000 per year, aggregate.
a. Engineering. Foundations must be constructed in accordance with complete plans
and specifications prepared, signed and sealed by a RLPE. The plans and
Page 1
specifications must be prepared specifically for the site of the work, and they must
meet criteria as to scope, content and form specified by the building official. If
there are trees that could affect a foundation,the RLPE must certify that the trees
have been taken into account in the preparation of the plans and specifications.
b. Geotechnical Report. The plans and specifications for each foundation must be
based on a written geotechnical report prepared, signed and sealed by a RLGE.
The report must cover all testing and site evaluation, and all must meet all
applicable criteria in"Recommended Practice for Geotechnical Explorations and
Reports"published by the Structural Committee of the Foundation Performance
Association, Houston, Texas (Document#FPA-SC-04-0, Rev#0, 11 April 2001,
issued for website publishing), a copy of which is on file in the City Secretary's
office.
Partial exception: If the basic type of foundation is"structural slab with
void space and deep foundations" or"structural floor with crawl space and
deep foundations,"as described below,the testing, evaluation and report
may be limited to a determination of the appropriate depth for the deep
foundations,but they must meet the other applicable criteria.
The minimum depth of borings is 20 feet in all cases. All tests and other
laboratory work must be performed by a laboratory accredited for such work by
the American Association for Laboratory Accreditation on the basis of ISO/IEC
17025:1999 ("general requirements for the competence of testing and calibration
laboratories").
c. Foundation Performance Standard. The plans and specifications for each
foundation must be prepared to achieve a foundation soil movement potential of
one inch or less, determined by the estimated depth of the active zone in
combination with at least two of the following methods:
(1) Potential vertical rise (PVR) determined in accordance with Test Method
Tex-124-E,Rev. January 1, 1978/December 1982, Texas State Department
of Highways and Public Transportation, Materials and Test Division,
"Method for Determining the Potential Vertical Rise,PVR"(a copy of
which is on file in the office of the City Secretary). For this purpose,the
"dry"moisture condition(from which little shrinkage is experienced,but
Page 2
where volumetric swell potential is greatest) shall be used for each sample
and test.
(2) Swell tests performed in accordance with ASTM D4546-03, "Standard
Test Methods for One-Dimensional Swell or Settlement Potential of
Cohesive Soils"as last revised prior to June 1,2004.
(3) Suction and hydrometer swell tests performed in accordance with ASTM
D5298-03 "Standard Test Method for Measurement of Soil Potential
(Suction)Using Filter Paper"and ASTM D6836-02 "Standard Test
Methods for Determination of the Soil Water Characteristic Curve for
Desorption Using a Hanging Column, Pressure Extractor,Chilled Mirror
Hygrometer, and/or Centrifuge," as such methods were last revised prior to
June 1,2004.
(Partial exception: If the basic type of foundation is "structural slab with void
space and deep foundations"or"structural floor with crawl space and deep
foundations,"as described below, neither a PVR determination nor a swell,
suction or hydrometer test is required.)
d. Foundations. Basic Types. Each foundation must be of an approved basic type.
Approved basic types are listed below. In this list,types of foundations are
defined and described in"Foundation Design Options For Residential and Other
Low-Rise Buildings on Expansive Soils"published by the Structural Committee
of the Foundation Performance Association, Houston,Texas (Document#FPA-
SC-01-0, Rev#0, 30 Jun 04,marked"For Website Publishing"), a copy of which
is on file in the City Secretary's office("FDO").
(1) Structural slab with void space and deep foundations.
(2) Structural floor with crawl space and deep foundations.
(3) Stiffened structural slab with deep foundations.
(4) Stiffened non-structural slab with deep foundations.
(5) Grade-supported stiffened structural slab.
(6) Grade-supported stiffened non-structural slab.
(7) Grade-supported non-stiffened slab of uniform thickness(approved for
one-story buildings--or additions to buildings--containing only garage or
storage space,not habitable space).
(8) Mixed-depth system for all new building construction.
Page 3
(9) Mixed-depth system for building additions with deep foundations.
(10) Another type approved by special exception issued by the BSC. See(h),
below.
e. Foundations. Deep Support Components. Deep support components must be of
an approved type. Approved types are listed below. In this list,types of deep
support components are defined and described in FDO.
(1) Drilled and underreamed concrete piers.
(2) Drilled straight-shaft concrete piers.
(3) Auger-cast concrete piles.
(4) Another type approved by special exception issued by the BSC. See(h),
below.
f. Foundations, reinforcement. Reinforcement for each foundation must be of an
approved type. Approved types are listed below. In this list,types of
reinforcement are defined and described in FDO.
(1) Deformed bar reinforcing.
(2) Welded wire fabric reinforcing(approved for one-story buildings--or
additions to buildings--containing only garage or storage space,not
habitable space).
(3) Another type approved by special exception issued by the BSC. See(h),
below.
g. Foundations. Observation & Certification. Each foundation must be
professionally observed and must be certified by an RLPE, as more fully
described below:
(1) Observations must:
(i) be performed either by the certifying RLPE or by one or more
persons under that RLPE's direct supervision and control whose
professional qualifications are approved by the RLPE(any such
person may be an RLGE,with respect to geophysical matters),
(ii) include actual measurement of piers, fill, compaction,
reinforcement,forms, materials,dimensions, structural elements,
Page 4
stressing, tendons,tensions,attachments, etc.before the work is
covered or concrete is placed,
(iii) be performed continuously during placement of concrete and any
stressing or tensioning operations, and
(iv) be documented in a form and manner approved by the building
official(which may include photographs).
(2) Certifications must:
(i) refer to and be based upon the professional observations required
by this section,
(ii) state that the work complies with the plans and specifications last
approved by the building official(with any field changes that are
ordered by the RLPE and reported to the building official and that
comply with applicable regulations),
(iii) state that the work complies with sound engineering practices,
(iv) comply with criteria as to form and content as may be specified by
the building official,
(v) be signed and sealed by the certifying RLPE,and
(vi) be filed with the building official.
(3) Certifications may:
(i) rely in part upon an attached certification by a RLGE, as to
geophysical matters, and
(ii) be kept on file by the City, for public inspection, for an indefinite
period of time.
Before framing or other work commences atop a foundation(and before the
foundation is otherwise covered),the permittee must obtain written
acknowledgment from the Building official that the certification for the
foundation was duly filed as required above.
h. Special Exceptions. The BSC may issue a special exception from any requirement
in subsection"a"through"g,"above,but only upon a showing that:
(1) the requirement will not affect life safety or the performance of a structure
Page 5
(for its estimated useful life); or
(2) an alternate requirement to be imposed by the special exception will
provide equal or better protection for life safety and long-term structural
performance.
In connection with any such special exception,the BSC may require that the
applicant provide supporting engineering data and opinion, and the BSC may
impose conditions to carry out the purpose and intent of applicable regulations.
4. All concrete piers, footings and foundations must be cured for at least 72 hours before any
significant load is placed on them.
5. All walls and ceilings within a R-1,R-2,R-3 and R-4 type occupancy shall be sheathed
with Type X gypsum board at least 5/8-inch(15.9 mm)thick. Exception: Where this
code(IBC)requires otherwise for moisture protection.
6. Delete: Appendices A(Employee Qualifications), B (Board of Appeals) and D (Fire
Districts).
International Energy Conservation Code, as it existed on May 1,2001, International Code
Council,Inc.
1. The administrative officer is the building official. All hearings,variances etc. are handled
by the BSC.
2. In lieu of inspection by City employees,the building official may require a written
certification that a building meets or exceeds minimum requirements,if the certification
is: (i) signed by a code-certified inspector(as defined in Section 388.02,TEX. HEALTH
& SAFETY CODE)not employed by the city, and(ii)accompanied by an approved
inspection checklist,properly completed, signed and dated by the inspector. If the fees of
the code-certified inspector are paid by the City,the amount shall be added to the building
permit fees otherwise payable. With approval from the building official,a permittee may
pay such fees directly to an independent inspection firm. Only code-certified inspectors
may perform inspections and enforce this code in the City.
International Fire Code,2000 Ed.,International Code Council,Inc.
1. The fire official shall be the fire chief or acting fire chief,who may detail other members
of the fire department or the building inspection division to act as inspectors. Chapter 6
of this Code shall apply to enforcement and administration of the fire code in the same
manner as it applies to the building code (except that the fire official shall have the
powers and duties of the building official under such articles).
2. The BSC shall have the same jurisdiction and authority with respect to the fire code as it
has with respect to the building code.
3. The limits of the fire district referred to in Section 902.1.1 are coextensive with the City
limits.
Page 6
4. Explosives and fireworks,as defined in Chapter 33, are prohibited within the City limits.
5. Notwithstanding Section 2206.7.6(relating to service stations),"latch-open"type devices
are prohibited.
6. Section 603.8.4(hours for burning) is amended to read in its entirety as follows: "An
incinerator shall not be used or allowed to remain with any combustion inside it: (i) at any
time from an hour preceding sunset on one day until sunrise the following day; or(ii)at
any time when unattended."
(7) Delete: Appendices FA(Board of Appeals), FE (Hazard Categories), FF (Hazard
Ranking) and FG(Cryogenic Fluids -Weight and Volume Equivalents).
International Fuel Gas Code,2000 Ed.,International Code Council,Inc.
1. The administrative officer is the building official. Chapter 6 of this Code shall apply to
enforcement and administration of this code in the same manner as it applies to the
building code. The BSC shall have the same jurisdiction and authority with respect to
this code as it has with respect to the building code.
2. Delete Sections FG103,FG106 and FG10.
3. Even if permitted by this code, copper tubing shall not be used for the yard service line.
4. Amend Section 311.2 to read in its entirety as follows: "Low pressure(not to exceed 0.5
PSI)gas piping shall withstand a pressure of at least 10 inches of mercury for a period of
time not less than 10 minutes without showing any drop in pressure, except that the
following shall apply in the case of new construction: The newly-constructed system
must withstand a pressure of at least 25 PSI for a period of not less than 10 minutes
without showing any drop in pressure as an initial pressure test, and the system must also
withstand a pressure as a final test. Higher pressure piping must withstand pressure of at
least 10 PSI,but never less than twice the maximum pressure to which the piping will be
subjected in operation, for a period of at least 10 minutes without showing a drop in
pressure,but the higher pressures required for new construction,above, shall be used to
test new construction in lieu of the 10-PSI level prescribed by this sentence."
5. There must be a permanently-installed stairway, either fixed or folding,to serve attic
space where appliances or equipment are located.
6. Even if permitted by this code,undiluted liquefied petroleum gas,or"LPG", shall not be
used at any fixed location in the City. Exception: This does not prohibit the use of such
gas in quantities of 10 gallons or less.
7. Each new or replaced gas meter shall be located on the same building site that it serves.
International Mechanical Code,2000 Ed.,International Code Council,Inc..
1. The administrative officer is the building official. All hearings,variances etc. are handled
by the BSC.
2. Add to Section M306.3: "There must be a permanently-installed stairway, either fixed or
folding,to serve attic space where appliances or equipment are located."
3. Add to Section M603: "All return air ducts must be installed within 10 inches of the
finished floor in all new residential construction and wherever possible in existing
buildings."
4. Delete: Appendix MB (Recommended Permit Fee Schedule).
Page 7
International Plumbing Code,2000 Ed., International Code Council,Inc.
1. The administrative officer is the building official. Chapter 6 of this Code shall apply to
enforcement and administration of this code in the same manner as it applies to the
building code. The BSC shall have the same jurisdiction and authority with respect to
this code as it has with respect to the building code.
2. Delete: Sections P103, P106 and P109 and Appendices PA(Plumbing Permit Fee
Schedule)and PG(Vacuum Drainage System).
3. Add at the beginning of Section 303.1: "Even if permitted by this code(IPC), ,none of
the following is allowed for use in the City: Acrylonitrile-Butadiene-Styrene(ABS)pipe
or fittings,polyethylene pipe or fittings,Type M copper, lead-based pipe,aluminum
DWV pipe or components, or air admittance valves."
4. Even if permitted by this code(IPC),PVC and CPVC type water pipe and fittings are not
allowed for use in the City. Exception: PVC water pipe may be used where permitted by
this code (IPC),but only if: (i)it is installed underground and(ii)all joints are primed and
glued as required by the manufacturer's recommendations(and the primer must be purple
or another distinctive color, except on above-ground pool piping).
5. Even if permitted by this code(IPC),wet venting shall not be allowed except when
authorized by the BSC, as a special exception for hardship and unusual cases.
6. Amend Section 1101.2 to read in its entirety as follows: "The provisions of this chapter
are applicable to interior leaders,building storm drains,building storm sewers, exterior
conductors, downspouts,roof gutters and other storm drainage fixtures and facilities."
7. Maximum water meter size,unless an RPE can clearly and convincingly demonstrate the
need for a larger meter in a particular case, is: 3/4ths-inch for an irrigation system, or f-
inch for a single-family dwelling.
International Residential Code, as it existed on May 1, 2001, International Code Council,
Inc..
1. The administrative officer is the building official. All hearings,variances etc. are handled
by the BSC.
2. This code, in lieu of the other"International Codes," applies to all residential structures in
the City. "Residential"means having the character of a detached one-family or two-
family dwelling that is not more than three stories high with separate means of egress,
including the accessory structures of the dwelling. This code does not apply to: (i) any
dwelling that has a common means of egress, such as a common hallway,or(ii)any
dwelling or structure that has the character of a facility used for accommodation of
transient guests or a structure in which medical,rehabilitative, or assisted living services
are provided in connection with the occupancy of the structure.
3. All amendments and deletions to the other"International Codes"adopted by this
Schedule are also carried forward and adopted as amendments and deletions from the
International Residential Code.
4. Delete: Appendices RAF (Radon Control Methods),RAI(Private Sewage Disposal),and
RAE(Manufactured Housing Used as Dwellings).
5. This code does not apply to installation and maintenance of electrical wiring and related
Page 8
components. See National Electrical Code,below.
(BOCA)National Building Code, 1996 Ed.,Building Officials& Code Administrators
International,Inc.
Only Sections 3108 (Radio And Television Towers)and 3109 (Radio And Television
Antennas),together with any necessary definitions or interpretative aids, are adopted. See
Subchapter G of Chapter 6 of this Code.
National Electrical Code, as it existed on May 1, 2001,National Fire Protection Association,
("NEC").
1. The administrative officer is the building official. All hearings,variances etc. are handled
by the BSC.
2. See Chapter 8 of this Code for various provisions which override or supplement the NEC.
Standard Housing Code, 1997 Ed., Southern Building Code Congress International,Inc.
1. The administrative officer is the building official. All hearings,variances etc. are handled
by the BSC.
PCUge 9