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HomeMy WebLinkAbout08042005 BSC Agenda Item 3 • • Draft amendment of the Standard Codes Schedule regarding structural framing and similar elements revised 8-1-05 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.. * * * 5. Structural Elements; Engineering, Etc. a. Scope ; Definitions. (1) The structural elements for the following must meet the criteria in this section, as applicable: (i) each new building (and each addition to an existing building) containing habitable space and having either a gross floor area of 485 square feet or more or a floor higher than four feet; and (ii) each accessible deck, porch, balcony, walkway and similar structure with a floor height greater than feet. [Note: Unless otherwise defined, "height" is measured from the "standard base level" as provided in the Zoning Ordinance.] (2) This section does not apply to foundation elements observed and certified Page 1 • under another section. (3) In this section: "A2LA Lab" means a laboratory accredited 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"). "RLPE"means a licensed or registered professional engineer of the State of Texas who is: (1) listed with the State Board of Professional Engineers in either the civil or structural branch of engineering (but, from and after May 1, 2006, listing in the structural branch is required); (2) employed by a registered engineering firm of the State of Texas; and (3) covered by professional errors and omissions insurance that: (i) has limits of at least $250,000 per claim (and at least $500,000 per year, aggregate) and (ii) has effective dates—including any retroactive coverage date—that include the entire period when the person provides services or takes actions regulated by this section. b. Engineering; Plans &Specifications. Structural elements must be constructed in accordance with complete plans and specifications prepared, signed and sealed by a RLPE. The plans and specifications must be prepared specifically for the structure in question, and they must meet criteria as to scope, content and form specified by the building official. c. Certain Requirements. (1) Fire Protection. Any part of a structural element within five feet of a property line must be composed of, or fully protected by, materials with a"one-hour" fire rating, or better, determined as provided in of the Code. (2) Framing; Sheathing. All framing must include full exterior sheathing Page 2 • • with structural elements (or blocking) along all joints. Th plans must indicate the type, size and spacing of fastners. All sheathing must be half-inch CDX plywood or better(neither oriented strand board nor any interior-grade material may be used). Any sheathing within four feet of the ground must be treated wood or other material that is resistant to insects and rot. Exception: Full sheathing is not required for steel and similar framing materials unless required or recommended by the manufacturer. (3) Trusses, Joists, Etc. (i) The species and grade of all lumber used for trusses, joists,purlins,purlin supports or similar elements must be specified in the plans. All such lumber must be graded and stamped, and utility-grade lumber longer than 24 inches may not be used for such elements. (ii) The plans must indicate that any truss used to support ceiling or floor joists was designed by the RLPE preparing the plans. (iii) There must be a vertical supporting element not farther than four inches from the each truss or joist, measured from centerline to centerline. (iv) The length, spacing and direction of trusses and joists must be specified in the plans; they may not be spaced farther apart than 19.2 inches on- center; and there must be a vertical support element directly beneath at least percent of the trusses or joists in each array. (v) Each manufactured wood truss must comply with applicable requirements of"Design Specifications For Light Metal Plate Connected Wood Trusses"published by Truss Institute, Ed. (vi) For each manufactured truss,the plans must indicate that the RLPE preparing the plans reviewed both the input loads used by the truss manufacturer and the final shop drawings and that all the manufacturer's recommended truss bracing is included in the plans. (vii) For each cantilevered truss, the plans must indicate that the truss was designed both with and without the cantilevered load and the RLPE preparing the plans specified (or approved)the strapping or other attachment for the support end opposite the cantilevered load. (4) Crawl Spaces. All metal joist hangers, brackets and similar fasteners used in crawl spaces must be fully galvanized or made of material that is resistant to corrosion. The plans must indicate that the RLPE preparing the plans specified the minimum "net" sizes and locations of openings required to achieve adequate ventilation of crawl spaces. Page 3 • (5) Welds. Unless otherwise specified by an RLPE: (i) all welds for butt- connected steel plates must be full joint-penetration welds, and (ii) all welds for lapped steel plates must be continuously fillet welded with fillet leg dimensions matching the inner plate thickness. All welds must comply with AWS D1.1 (see Section 1704.3.1, IBC). See, also, observation and certification requirements for welds, below. (6) Stairwells, Chimneys, Etc.. The plans must indicate that an RLPE specified cross-bracing or similar structural elements for each stairwell, chimney, free- standing wall and similar vertical space or element. d. Observation & Certification. Structural elements 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, (ii) include actual observation of structural elements and attachments in crawl spaces before they are covered by floors or other materials, (iii) include actual observations of each beam,joist, rafter, truss and similar element, including each related weld and high- strength bolt: (i) after all required plumbing, electrical and mechanical "rough- in" inspections have been passed and all expected "notching," boring and similar Page 4 • • work has been done, and(ii)before the item is covered, and (iii) 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 portions of the work required to be observed comply with the plans and specifications last approved by the building official (with any field changes that are ordered by the RLPE, reported to the building official and in compliance with applicable regulations), (iii) comply with criteria as to form and content as may be specified by the building official, (iv) be signed and sealed by the certifying RLPE, and (v) be filed with the building official. (3) Certifications may rely in part upon attached certifications by: (i) an A2LA Lab, as to materials testing, and (ii) an inspector certified by the City of Houston, as to welds or high-strength bolts (see, also, Section 1704.3.3 of the IBC). Before any a beam,joist, rafter, truss, weld, high-strength bolt or similar element is covered: (i) all required city inspections relating to that element must be passed, and (ii) the permittee must obtain written acknowledgment from the building official that the certification for that element was duly filed as required above. For any given building, there may be more than one certification filed. After a beam,joist, rafter,truss, weld, high-strength bolt or similar element has been observed and certified, as provided above, it may not be notched, bored or structurally altered without: (i) a new or amended permit, if required, and (ii) a Page 5 • • • new observation and certification, in accordance with this section. Certifications, plans, specifications and related items may be kept on file by the City, for public inspection, for an indefinite period of time. e. Special Exceptions. The BSC may issue a special exception from any requirement in subsection"a"through"c," 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. * * * Page 6 r • Document Compare Summary Original document: C:\Documents and Settings\Geneva\My Documents\CODES\WUP Code of Ordinances\Updates to 2003 Edition\54 o structural framing 7-6-05 CLEAN.wpd Revised document: C:\Documents and Settings\Geneva\My Documents\CODES\WUP Code of Ordinances\Updates to 2003 Edition\54 o structural framing 8-1-05 CLEAN.rtf Deletions are shown with the following attributes and color: Strikeout, Blue RGB(0,0,255). Deleted text is shown as full text. Insertions are shown with the following attributes and color: Double Underline,Redline, Red RGB(255,0,0). The document was marked with 76 Deletions, 49 Insertions, 0 Moves. Draft amendment of the Standard Codes Schedule regarding structural framing and similar elements revised -7 6==058-1-05 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. I International Building Code, 2000 Ed.,International Code Council, Inc.. * * * 5. Structural Elements; Engineering,Etc. a. Scope ;Definitions. Page 1 • • (1) The structural elements for the following must meet the criteria in this section, as applicable: (i) each new building(and each addition to an existing building) containing habitable space and having either a gross floor area of 485 square feet or more or a floor higher than four feet; and (ii)— each accessible deck,porch,balcony, walkway and similar structure with a floor height greater than feet. [Note: Unless otherwise defined, "height"is measured from the "standard base level"as provided in the Zoning Ordinance.] (2) This section does not apply to foundation elements observed and certified under another section. (3) In this section: "A2LA Lab"means a laboratory accredited 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"). "RLPE"means a licensed or registered professional engineer of the State of Texas who is: (1) listed with the State Board of Professional Engineers in either the civil or structural branch of engineering (but, from and after May 1,2006, listing in the structural branch is required); (2) employed by a registered engineering firm of the State of Texas; and (3) covered by professional errors and Page 2 • - • • • omissions insurance that: (i) has limits of at least$250,000 per claim(and at least $500,000 per year, aggregate) and(ii)has effective dates—including any retroactive coverage date—that include the entire period when the person provides services or takes actions regulated by this section. I b. Engineering;Plans &Specifications. Structural elements must be constructed in accordance with complete plans and specifications prepared, signed and sealed by a RLPE. The plans and specifications must be prepared specifically for the structure in question, and they must meet criteria as to scope, content and form specified by the building official. c. Certain Requirements. (1) Fire Protection. Any part of a structural element within five feet of a property line must be composed of, or fully protected by,materials with a"one-hour" fire rating, or better, determined as provided in of the Code. (2) Framing; Sheathing. All framing must include full exterior sheathing,using: (i)with structural elements (or blocking) along all 'oints. Th plans must indicate the type size and spacing of f:astners. All sheathing must be half-inch CDX plywood or better - : , • •• •• - • • four inches on-center or closer. Neither(neither oriented strand board nor any interior-grade material may be usedl. Any sheathing within four feet of the ground must be treated wood or other material that is resistant to insects and rot. Exception: Full sheathing is not required for steel and similar framing materials unless required or recommended by the manufacturer._ Page 3 , • • (3) Trusses, Joists, Etc. (i) The species and grade of all lumber used for trusses,joists,purlins,purlin supports or similar elements must be specified in the plans. All such lumber must be graded and stamped, and utility-;grade lumber longer than 24 inches may not be used for thesesuch elements. (ii) The plans must indicate that any truss used to support ceiling or floor joists was designed by the RLPE preparing the plans. (iii) There must be a vertical supporting element not farther than four inches from the centerline of each truss or joist, measured from centerline to centerline. (iv) The length, spacing and direction of trusses and joists must be specified in the plans; they may not be spaced farther apart than 19.2 inches on-center; and there must be a vertical support element directly beneath at least percent of the trusses or joists in each array. (v) Each manufactured wood truss must comply with applicable requirements of"Design Specifications For Light Metal Plate Connected Wood Trusses" published by Truss Institute, Ed. (vi)For each manufactured truss,the plans must indicate that the RLPE preparing the plans reviewed both the input loads used by the truss manufacturer and the final shop drawings;and that all the manufacturer's recommended truss bracing is included in the plans. (vii) For each cantilevered truss, the plans must indicate that the truss was designed both with and without the cantilevered load and that anthe RLPE(or an engineer employed bypre the truss manufacturer)plaps specified(or approved)the strapping or other attachment for the support end opposite the cantilevered load. (4) Crawl Spaces. All metal joist hangers,brackets and similar fasteners used in crawl spaces must be fully galvanized or made of material that is resistant to corrosion. The plans must indicate that the RLPE preparing the plans specified the minimum "net" sizes and locations of openings required to achieve adequate ventilation of crawl spaces. Page 4 . • • • (5) Welds. Unless otherwise specified by an RLPE: (i) all welds for butt-connected steel plates must be full joint-penetration welds, and (ii) all welds for lapped steel plates must be continuously fillet welded with fillet leg dimensions matching the inner plate thickness. All welds must comply with AWS D1.1 (see Section 1704.3.1, IBC). See, also, observation and certification requirements for welds,below. (6) Stairwells, Chimneys, Etc.. The plans must indicate that an RLPE specified cross-bracing or similar structural elements for each stairwell, chimney, free-standing wall and similar vertical space or element. --h-d. Observation & Certification. Structural elements must be professionally observed and must be certified by an RLPE, as more fully described below: 1 (1) Observations must: 1 (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, 1 (ii) include actual observation of structural elements and attachments in crawl spaces before they are covered by floors or other materials, (iii)— include actual observations of each beam,joist,rafter,truss and similar element, including each related weld and high- strength bolt: (i)after all required plumbing, electrical and mechanical"rough-in" inspections have been passed and all expected"notching,"boring and similar Page 5 • work has been done, and(ii)before the item is covered, and (iii)— 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 portions of the work complies re uired to be observed com.l with the plans and specifications last approved by the building official(with any field changes that are ordered by the RLPE, reported to the building official and in compliance with applicable regulations), (iii)— comply with criteria as to form and content as may be specified by the building official, (iv)— be signed and sealed by the certifying RLPE, and (v) be filed with the building official. (3) Certifications may rely in part upon attached certifications by: (i) an A2LA Lab, as to materials testing, and(ii)an inspector certified by the City of Houston, as to welds or high-strength bolts (see, also, Section 1704.3.3 of the IBC). Before any a beam,joist,rafter, truss,weld,high-strength bolt or similar element is covered: (i) all required city inspections relating to that element must be passed, and(ii)the permittee must obtain Page 6 • • written acknowledgment from the building official that the certification for that element was duly filed as required above. For any given building,there may be more than one certification filed. After a beam,joist,rafter,truss, weld,high-strength bolt or similar element has been observed and certified, as provided above, it may not be notched,bored or structurally altered without: (i)a new or amended permit, if required, and(ii) a new observation and certification, in accordance with this section. Certifications,plans, specifications and related items may be kept on file by the City, for public inspection, for an indefinite period of time. --t—e. Special Exceptions. The BSC may issue a special exception from any requirement in subsection"a"through"c,"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. * * * Page 7