International Building Code Essentials for Wood Construction
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International Building Code Essentials for Wood Construction Dennis Richardson, P.E., C.B.O., CASp Western Regional Manager American Wood Council • “The Wood Products Council” is • This course is registered with a Registered Provider with The AIA CES for continuing American Institute of Architects professional education. As such, Continuing Education Systems it does not include content that (AIA/CES), Provider #G516. may be deemed or construed to be an approval or endorsement by the AIA of any material of • Credit(s) earned on completion construction or any method or of this course will be reported to manner of AIA CES for AIA members. handling, using, distributing, or Certificates of Completion for dealing in any material or both AIA members and non-AIA product. members are available upon • Questions related to specific request. materials, methods, and services will be addressed at the conclusion of this presentation. 1 Copyright Materials This presentation is protected by US and International Copyright laws. Reproduction, distribution, display and use of the presentation without written permission of AWC is prohibited. © American Wood Council 2014 Course Description • Based on the new AWC/International Code Council publication, Code Conforming Wood Design (CCWD), this presentation takes the mystery out of International Building Code (IBC) parameters for wood in non- residential and multi-residential construction. Topics will include maximum building sizes (participants will receive pre-calculated tables for eight occupancies, with and without frontage and sprinkler increases); alternatives for establishing required fire resistance; special provisions for pedestal buildings; precautionary recommendations for buildings under construction; criteria for finishes, exterior coverings, appendages, and other wood features; and the use of AWC design standards and other publications in relation to the IBC. Participants may download a complimentary copy of the CCWD www.awc.org/codes/ccwdindex.html. 2 Objectives • Upon completion, participants will be better able to: •1. Identify building size and use parameters for wood as the primary structural elements. •2. Identify methods specified by the code for establishing fire resistance of wood assemblies and elements, and fire precautions during construction •3. Apply special provisions for design of wood structures that involve compartmentalization and sprinkler systems •4. Apply code provisions for the non-structural use of wood in buildings, such as for finishes, appendages, siding, and trim. CCWD 3 CCWD Document • This program is based on the Code Conforming Wood Design (CCWD) document • The CCWD is intended as a brief yet comprehensive resource for wood design in accordance with the IBC • Download at (go to “Codes and Standards” and then “Codes”; or just type “CCWD” in the search box) Classifications • Group A, Assembly occupancies • Group B, Business occupancies • Group E, Educational occupancies • Group F, Factory/Industrial occupancies • Group I, Institutional occupancies • Group M, Mercantile occupancies • Group R, Residential occupancies • Group S, Storage occupancies 4 BUILDING SIZE p. 7-12 of the CCWD Table 503 Excerpt, Allowable Building Heights and Areas Type of Construction Height Type III Type IV Type V (ft) Group A B HT A B 65 55 65 50 40 Stories (S) Area (A) S3 2 3 2 1 A-3 A14,0009,50015,00011,5006,000 S5 3 5 3 2 B A28,50019,00036,00018,0009,000 S3 2 3 1 1 E A23,50014,50025,50018,5009,500 S4 2 433 1 M A18,50012,50020,50014,0009,000 S4 4 4 3 2 R-1 A24,00016,00020,50012,0007,000 S4 4 4 3 2 R-2 A24,00016,00020,00012,0007,000 S3 2 4 3 1 S-1 A26,00017,50025,50014,0009,000 5 CCWD Table 12: Group M NFPA 13–Compliant Sprinklered Buildings – Maximum floor area per story a, b, c # of % Maximum floor area per floor (sq. ft.) stories frontage IIIA IIIB IV VA VB 0-25 74,000 50,000 82,000 56,000 36,000 50 78,620 53,120 87,120 59,500 38,250 1 100 87,870 59,370 97,370 66,500 42,750 100 (60’)d UL UL UL UL UL 0-25 55,500 37,500 61,500 42,000 27,000 50 60,120 40,620 66,620 45,500 29,250 2 100 69,370 46,870 76,870 52,500 33,750 100 (60’)d UL UL UL UL UL 0-25 55,500 37,500 61,500 42,000 NP 3 50 60,120 40,620 66,620 45,500 NP 100 69,370 46,870 76,870 52,500 NP (table continued on next slide) CCWD Table 12: Group M NFPA 13–Compliant Sprinklered Buildings – Maximum floor area per story a, b, c (cont.) # of % Maximum floor area per floor (sq. ft.) stories frontage IIIA IIIB IV VA VB 0-25 41,620 NP 46,120 31,500 NP 4 50 45,090 NP 49,960 34,120 NP 100 52,030 NP 57,650 39,370 NP 0-25 33,300 NP 36,900 NP NP 5 50 36,070 NP 39,970 NP NP 100 41,620 NP 46,120 NP NP a. The maximum floor area for four or more stories above grade plane was determined by dividing the maximum total allowable building area by the number of stories in accordance with Section 506.4. The floor area of the stories is assumed to be equal. b. Frontage based on open space widths of 30 feet or more. c. Interpolation permitted. d. Sprinklered Group M buildings of one or two stories may be unlimited in area if the frontage width is at least 60 feet in accordance with Sections 507.3 and 507.4. 6 Allowable Building Area Calculation •Given: Single-story Type VB grade school •Provided with an NFPA 13-compliant automatic sprinkler system throughout and located on lot as shown. Determine: Maximum allowable building area 100 250 60 40 Maximum Allowable Area Aa = {At + [At x If] + [At x Is]} (Equation 5-1) 100 60 250 40 7 Maximum Allowable Area Aa = {At + [At x If] + [At x Is]} (Equation 5-1) Aa = {9500 + [9500 x If] + [9500 x Is]} (Table 503) 100 60 250 40 Maximum Allowable Area Aa = {At + [At x If] + [At x Is]} (Equation 5-1) Aa = {9500 + [9500 x If] + [9500 x Is]} (Table 503) If = (F / P –0.25) x W / 30 (Equation 5-2) 100 60 250 40 8 Maximum Allowable Area Aa = {At + [At x If] + [At x Is]} (Equation 5-1) Aa = {9500 + [9500 x If] + [9500 x Is]} (Table 503) If = (F / P –0.25) x W / 30 (Equation 5-2) If = (350/700 –0.25) x 30/30 = .25 (where W > 30, use 30, 506.2.1) 100 60 250 40 Maximum Allowable Area Aa = {At + [At x If] + [At x Is]} (Equation 5-1) Aa = {9500 + [9500 x If] + [9500 x Is]} (Table 503) If = (F / P –0.25) x W / 30 (Equation 5-2) If = (350/700 –0.25) x 30/30 = .25 (where W > 30, use 30) 100 60 250 40 9 Maximum Allowable Area Aa = {At + [At x If] + [At x Is]} (Equation 5-1) Aa = {9500 + [9500 x If] + [9500 x Is]} (Table 503) If = (F / P –0.25) x W / 30 (Equation 5-2) If = (350/700 –0.25) x 30/30 = .25 (where W > 30, use 30) Is = 3 for single story (Section 506.3) 100 60 250 40 Maximum Allowable Area Aa = {At + [At x If] + [At x Is]} (Equation 5-1) Aa = {9500 + [9500 x If] + [9500 x Is]} (Table 503) If = (F / P –0.25) x W / 30 (Equation 5-2) If = (350/700 –0.25) x 30/30 = .25 (where W > 30, use 30) Is = 3 for single story (Section 506.3) Aa = {9500 + [9500 x .25] + [9500 x 3]} Aa = 40,375 100 60 250 40 10 Maximum Allowable Area Aa = {At + [At x If] + [At x Is]} (Equation 5-1) Aa = {9500 + [9500 x If] + [9500 x Is]} (Table 503) If = (F / P –0.25) x W / 30 (Equation 5-2) If = (350/700 –0.25) x 30/30 = .25 (where W > 30, use 30) Is = 3 for single story (Section 506.3) Aa = {9500 + [9500 x .25] + [9500 x 3]} Aa = 40,375 100 Actual area = (250)(100) = 25,000 OK 60 250 40 W vs. Fire Separation Distance W Bldg. 1 imaginary lot line Bldg. 2 FSD 11 W vs. Fire Separation Distance lot line W Bldg. 1 Bldg. 2 FSD FSD centerline of public way W CCWD • About height limits . 12 Table 503 Excerpt, Allowable Building Heights and Areas Type of Construction Height Type III Type IV Type V (ft) Group A B HT A B 65 55 65 50 40 Stories (S) Area (A) S3 2 3 2 1 A-1 A14,0008,50015,00011,5005,500 S3 2 3 2 1 A-2 A14,0009,50015,00011,5006,000 S3 2 3 2 1 A-3 A14,0009,50015,00011,5006,000 S3 2 3 2 1 A-4 A14,0009,50015,00011,5006,000 SUL UL UL UL UL A-5 AULULULULUL S5 3 5 3 2 B A28,50019,00036,00018,0009,000 S3 2 3 1 1 E A23,50014,50025,50018,5009,500 Table 503 Excerpt, Allowable Building Heights and Areas Type of Construction Height Type III Type IV Type V (ft) Group A B HT A B 65 55 65 50 40 Stories (S) Area (A) S3 2 3 2 1 A-1 A14,0008,50015,00011,5005,500 S3 2 3 2 1 A-2 A14,0009,50015,00011,5006,000 S3 2 3 2 1 A-3 A14,0009,50015,00011,5006,000 S3 2 3 2 1 A-4 A14,0009,50015,00011,5006,000 SUL UL UL UL UL A-5 AULULULULUL S5 3 5 3 2 B A28,50019,00036,00018,0009,000 S3 2 3 1 1 E A23,50014,50025,50018,5009,500 13 Height Increases for Sprinklers Table 503 limit Height Increases for Sprinklers + 1 story and 20 ft.