LEGACY REPORT

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NER-707

LEGACY REPORT ICC Evaluation Service, Inc. www.icc-es.org

Reissued May 1, 2005

Business/Regional Office # 5360 Workman Mill Road, Whittier, California 90601 # (562) 699-0543 Regional Office # 900 Montclair Road, Suite A, Birmingham, Alabama 35213 # (205) 599-9800 Regional Office # 4051 West Flossmoor Road, Country Club Hills, Illinois 60478 # (708) 799-2305

Legacy report on the 2000 International Building Code®, the 2000 International Residential Code™ the 2002 Accumulative Supplement to the International Codes™, the 1999 Standard Building Code©, the BOCA® National Building Code/1999, the 1997 Uniform Building Code™ DIVISION 06—WOOD AND PLASTIC Section 06170—Prefabricated Structural Wood

At the time of fabrication, all lumber and OSB used has a moisture content not exceeding 19%. Adhesives used in all gluing operations meet the requirements of ASTM D 2559.

GEORGIA-PACIFIC CORPORATION 310 CYPRESS ROAD OCALA, FLORIDA 34472 (352) 680-1500 www.gp.com/build/index.aspx

Joist series and sizes included in this report are shown in Figure 1. Section design properties of the WI 40, WI 60, WI 80, WI 80A, and WI 85 Series joists are shown in Tables 1 and 2 at the end of this report.

Wood I Beam®: WI Series Joist: WI 40, WI 60, WI 80, WI 80A, and WI 85 joists

In addition to structural properties, this report includes a fire resistance evaluation of Georgia-Pacific WI Series joists as components of 1-Hour fire rated floor-ceiling or roof-ceiling assemblies. See details under Section 4 of this report.

2.0

PROPERTY FOR WHICH EVALUATION IS SOUGHT

4.0

INSTALLATION

2.1 2.2

Structural Fire Resistance

4.1

General

3.0

DESCRIPTION

1.0

SUBJECT

Georgia-Pacific Corporation's pre-fabricated, oriented strand board (OSB) web I-joists are made by bonding lumber flanges to OSB webs with a waterproof glue. The flanges for the WI 40 Series joists are fabricated from nominal 2 x 3, proprietary 1650f-1.5E MSR lumber. The flanges for the WI 60 Series joists are fabricated from nominal 2 x 3, 2100f-1.8E MSR lumber. The flanges for the WI 80 Series joists (117/8 to 16 inches deep) and WI 80A Series joists (18 and 20 inches deep) are fabricated from nominal 2 x 4, 2100f-1.8E MSR lumber. The flanges for the WI 80A Series joists (91/2 to 16 inches deep), WI 80 Series joists (18 and 20 inches deep), and WI 85 Series joists are fabricated from nominal 2 x 4 visually graded Dense Select Structural (DSS) Southern Pine lumber. The webs for the WI 40, WI 60, WI 80, and WI 80A Series joists are fabricated from 3/8 inch (9.5 mm) thick OSB proprietary web stock. The webs for the WI 85 Series joists are fabricated from 19/32 inch (15.1 mm) thick rated sheathing (40/20) Exposure 1 OSB conforming to US Product Standard PS-2. The flanges receive 2 or 3 saw kerfs for web thicknesses of 3 /8 inch (9.5 mm) and 19/32 inch (15.1 mm) respectively. The resulting OSB splines are inserted into the flange grooves and glued. The OSB webs are installed with the face flakes oriented in the vertical direction. Abutting webs are joined with a glued, modified tongue and groove joint. Finger joints are used to fabricate flanges, with appropriate testing to insure full tension capacity of the mated lumber.

Installation of Georgia Pacific's WI Series joists shall be in accordance with the manufacturer's published installation instructions and this report. Should there be any conflicts between the manufacturer's instructions and this report, the conditions set forth in this report shall govern. 4.2

Section Properties

Tables 3 and 4 of this report contain allowable spans for WI 40, WI 60, WI 80, WI 80A, and WI 85 Series floor joists for use in residential applications. For applications not covered by this report design shall be based on engineering analysis using the design properties noted in Tables 1 and 2. Design loads for WI Series joists, rafters, and headers shall be determined in accordance with the requirements of the applicable Code and deflections under design load conditions shall not exceed those noted in the applicable Code. Allowable load/spans shall be as noted in Tables 3 and 4 of this report, as applicable, or determined from calculations based on Tables 1 and 2. 4.3

Web Holes

Figure 2 of this report outlines rules concerning placement of holes in the web of WI 40, WI 60, WI 80, and WI 80A Series joists. The effect of holes in the webs of the WI 85 Series joists has not been evaluated by this report. Rules are applicable only for joists designed using the allowable load/span tables in this report. For other design conditions, contact BlueLinx Technical Services (800/839-2588) for assistance.

ICC-ES legacy reports are not to be construed as representing aesthetics or any other attributes not specifically addressed, nor are they to be construed as an endorsement of the subject of the report or a recommendation for its use. There is no warranty by ICC Evaluation Service, Inc., express or implied, as to any finding or other matter in this report, or as to any product covered by the report.

Copyright © 2005

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Page 2 of 15 Except when cutting to length (or for birdsmouth bearing at the lower end of a rafter), FLANGES SHALL NOT BE CUT. 4.4

Bearing Stiffeners

Field-installed bearing stiffeners are required on both sides of the webs at: • end reactions of joists when needed to meet the allowable reaction requirements of Tables 1 and 2 • ends of joists placed in "U" type hangers if the sides of the hanger do not laterally support the top flange. • birdsmouth cuts • hangers with side nailing

NER-707 4.8

Bracing

Continuous lateral support of the top (compression flange) of the WI Series joists shall be provided using diaphragm sheathing attached to the top flange in accordance with the requirements of the code or other equivalent means. Additionally, the joist ends shall be restrained to prevent rollover and lateral support is required at the intermediate supports of multiple span joists. Bridging is not required in WI Series joist floor and roof applications. However, bracing is required during joist installation and construction.

Bearing stiffeners shall consist of nominal 2 by 4's (construction grade or better) oriented vertically or any combination of 3/8, ½, 5/8, or 3/4 inch (9.5, 12.7, 15.9, or 19.1 mm) thick plywood (sheating grade meeting PS1 or PS2) 25/16 inches (58.7 mm) wide for WI 40 and WI 60 Series joists, and 31/2 inches (88.9) wide for WI 80, WI 80A, and WI 85 Series joists so that the stiffener is flush with the outside edge of the flange. Plywood stiffener face grain is to be oriented vertically. The stiffeners are placed against the bottom flange and a 1/4 inch (+/-) (6.4 mm) gap shall be left between the top flange and each stiffener (stiffeners must not be wedged between flanges). Bearing stiffeners at birdsmouth cuts shall be beveled to match roof slope. The stiffeners shall be free of splits or gross defects and shall be fastened with 12d common nails (10d common nails for WI 40 and WI 60 series) as shown in Figure 3 of this report. Nails may be driven from either side and must be clinched where possible. The nails shall be staggered to prevent excessive splitting of the stiffener.

4.9

6.0

EVIDENCE SUBMITTED

4.5

6.1

Manufacturer’s descriptive literature and published installation instructions.

6.2

Reports on mechanical and physical property tests on WI 40 & WI 80 Series I-joist conducted by GeorgiaPacific Corporation and witnessed by APA: ! Shear, End Reaction and Intermediate Reaction properties, ELP Report No. 0928-00, dated September 28, 2000 and revised February 4, 2004, signed and sealed by Joseph H. Kaiserlik, P.E. ! Flexural and creep properties, ELP Report No. 0719-00, dated July 19, 2000 and revised February 1, 2001, signed by Joseph H. Kaiserlik, P.E. ! Shear performance with web holes, ELP Report No. 0614-00, dated June 14, 2000 and revised July 2, 2002, signed by Joseph H. Kaiserlik, P.E. ! Vertical load-carrying capacity (WI 40 Series Only), ELP Report No. 0609-00, dated June 9, 2000, signed by Joseph H. Kaiserlik, P.E.

6.3

Reports on mechanical and physical property tests on WIF Series I-joist conducted by Georgia-Pacific Corporation and witnessed by APA: ! Shear, End Reaction and Intermediate Reaction properties, ELP Report No. 0513-99, dated May 13, 1999 and revised February 1, 2001, signed by Joseph H. Kaiserlik, P.E. ! Flexural properties, ELP Report No. 0315-99, dated March 15, 1999 and revised February 1, 2001, signed by Joseph H. Kaiserlik, P.E. ! Shear performance with web holes, ELP Report No. 0319-99, dated March 19, 1999 and revised July 8, 2002, signed by Joseph H. Kaiserlik, P.E. ! Vertical load-carrying capacity, ELP Report No. 0505-99, dated May 5, 1999, and revised July 8, 2002, signed by Joseph H. Kaiserlik, P.E.

Web Stiffeners

Field-installed web stiffeners are required on WI Series joists at locations of concentrated loads greater than the lesser of the allowable shear or 1,500 pounds. Concentrated loads shall be applied only to the top of the top flange, except that loads not exceeding 350 lb (1.5 kN) may be applied symmetrically to the top of the bottom flange over a distance of not less than 12 inches (300 mm). Web stiffeners shall be installed as noted above for bearing stiffeners, except the 1/4 inch (+/-) (6.4 mm) gap shall be left between the bottom flange and each stiffener. 4.6

Intermediate bearings on multiple span joists shall be at least 31/2 inches (88.9 mm) in length. Increased bearing lengths shall be provided to increase the allowable reaction capacity when necessary to meet the requirements of Tables 1 and 2. 4.7

Based on fire resistance tests conducted in accordance with ASTM E 119 and related studies, three floor-ceiling assemblies containing Georgia-Pacific's WI Series joists as components of the assemblies are listed by this report. The assemblies shown in Figures 5, 6, and 7 at the end of this report are assigned a ONE HOUR fire resistance rating. 5.0

Blocking Panels

WI Series joists located under bearing walls that run perpendicular to the joists shall have full-depth blocking panels, rim joist, or squash block members to transfer gravity loads from above the wall to the wall or foundation below (see Figure 4 for load transfer methods). The maximum vertical load permitted with these details is 2000 plf (29,186 N/m), except that the FiberStrong™ option of Detail F5 may be used where the applied vertical load does not exceed 5700 plf (83,181 N/m). Floor to wall and diaphragm connection details are beyond the scope of this report.

IDENTIFICATION

All Georgia-Pacific WI Series joists indicated in this report shall be identified by a stamp containing date of manufacture, the manufacturer’s name and plant number, the product trade name, the flange species/grade, the number of this evaluation report, and the name and trademark of the quality assurance agency (APA - Engineered Wood Systems).

Bearing Lengths

End bearings of WI Series joists shall be at least 13/4 inches (38.1 mm) in length. Joists used in fire rated assemblies as outlined in this report are required to have at least 2 inches (50.8 mm) of bearing. Increased bearing lengths shall be provided to increase the allowable reaction capacity when necessary to meet the requirements of Tables 1 and 2.

Fire Resistance

Page 3 of 15 6.4

Qualification Test Reports on Finger-Jointed Flange stock, conducted by Georgia-Pacific Corporation and witnessed by APA: ! Test data summary and analysis of Ocala Plant 2100f, 2x4 finger-jointed flange - SPF, ELP Report No. 1012-99, dated October 12, 1999, signed by Joseph H. Kaiserlik, P.E.; ! Test data summary and analysis for Maboco fingerjointed flange - SPF, 2100f, ELP Report No. 0820-98, dated August 20, 1998 and revised July 5, 2002, signed by Joseph H. Kaiserlik, P.E.; ! Test data summary and analysis of Ocala Plant Dense Select Structural (DSS), 2x4 finger-jointed flange - Southern Yellow Pine, ELP Report No. 101399, dated October 13, 1999, signed by Joseph H. Kaiserlik, P.E.; ! Test data summary and analysis of CFL Structure Inc. finger-jointed flange - Proprietary 1650f-1.5E, SPF, ELP Report No. 0830-01, dated August 30, 2001, signed by Joseph H. Kaiserlik, P.E.; ! Test data summary and analysis of Tembec LaSarre, Inc.. finger-jointed flange - Proprietary 1650f1.5E, SPF, ELP Report No. 0921-01, dated September 21, 2001, signed by Joseph H. Kaiserlik, P.E.

6.5

WI 40 and 80 Series Joist Qualification – Raw Test Data, Volumes I, II, III, IV and V.

6.6

WIF Series Joist (OSB Web) Qualification – Raw Test Data, Volumes I, II, III, IV and V.

6.7

Quality Control Manual and Inspection Procedures, dated January 19, 2004 Revision 2A.

6.8

Manufacturer's load/span tables and accompanying sample calculations, signed and sealed by J. H. Kaiserlik, P.E.

6.9

Reports of tests conducted in accordance with ASTM E 119, prepared by Warnock Hersey International, Inc., signed by Harold J. Risler: ! Report No. WHI-651-0311.1, dated and tested February 9, 1990, revised July 20, 1990.

6.10

Report concerning the Calculation of a 1-Hour Fire Endurance Assembly using 2-layers of Type C Gypsum Wallboard Attached to Resilient Channels, prepared by Qualtim, dated August 15, 1994, revised July 29, 1999, revised November 11, 2001 signed and sealed by Kirk H. Grundahl, P.E.

6.11

Report concerning the Calculation of a 1-Hour Fire Endurance Assembly using 2-layers of ½" Type C Gypsum Wallboard Directly Attached to I-joists, prepared by Qualtim, dated August 15, 1994, revised July 29, 1999, revised November 11, 2001 signed and sealed by Kirk H. Grundahl, P.E.

6.12

Manufacturer's web hole charts and accompanying sample calculations, dated April 25, 2003, signed and sealed by Richard D. Graham, P.E.

NER-707 7.0

CONDITIONS OF USE

The ICC-ES Subcommittee for the National Evaluation Service finds that Georgia-Pacific’s WI Series joists are an alternative material to that specified in the 2000 International Building Code®, the 2000 International Residential Code™ the 2002 Accumulative Supplement to the International Codes™, the 1999 Standard Building Code©, the BOCA® National Building Code/1999, the 1997 Uniform Building Code™, subject to the following conditions: 7.1

Design calculations and details for specific applications shall be furnished to the code official verifying compliance with this report and the applicable code. The individual preparing such documents shall possess the necessary credentials regarding competency and qualifications as required by the applicable code and the professional registration laws of the state where the construction is undertaken.

7.2

The manufacturer's published installation instructions and this report shall be strictly adhered to. Design loads for WI Series joists shall be determined in accordance with the requirements of the applicable code. Deflections under design load conditions shall not exceed those noted in the applicable code.

7.3

At the time of fabrication, all lumber and OSB used must have a moisture content not exceeding 19%. In service moisture content of the joist and header components shall not exceed 16%.

7.4

WI Series joists shall be installed such that loads are applied parallel to the web and no concentrated loads are applied to the bottom flange (except as permitted for joists as noted in Section 4.5 of this report).

7.5

WI Series joist flanges shall not be cut, drilled or notched except when cutting the beams to length or for providing birdsmouth bearings at the lower end of a rafter.

7.6

Georgia-Pacific Corporation's facilities shall be available during regular working hours to the ICC-ES for inspection.

7.7

This report is subject to periodic re-examination. For information on the current status of this report, contact the ICC-ES.

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Figure 5 - ONE HOUR Fire Rated Floor/Ceiling Assembly

1.

2.

Topping (Optional) - Lightweight concrete, maximum density 110 pcf (1760 kg/m3), minimum compressive strength 3000 psi (20.7 MPa) or proprietary gypsum/cement/sand topping, maximum density 100 pcf (1600 kg/m3), minimum compressive strength 1000 psi (6.9 MPa). Minimum topping thickness for lightweight concrete is 11/2 inches (38.1 mm) and for proprietary topping 3/4 inch (19.1 mm) with joists spaced at 20 inches (508 mm) o.c. or less and 1 inch (25.4 mm) with joist spacing greater than 20 inches (508) up to 24 inches (610 mm) o.c. Flooring - The flooring shall be one of the following systems: System No. 1 /32 inch (18.3 mm) thick Georgia-Pacific Rated Sturd-I-Floor 5-ply plywood, Exposure 1, tongue and groove, installed perpendicular to the WI Series joists with end joints centered over the top flanges of the joists and staggered. The plywood is nailed and glued with construction adhesive. The construction adhesive is applied to the top flanges of the WI Series joists using a single zig-zag, 1/4 inch (6.4 mm) diameter, bead. Double beads are applied at joints and a bead of adhesive is applied to the tongue and groove joint. The plywood is nailed, using 8d ring- or screw-shank nails at 8 inches (203 mm) o.c. maximum at supported panel edges and 12 inches (304 mm) o.c. maximum at intermediate supports. System No. 2 5 /8 inch (15.9 mm) thick Georgia-Pacific rated Sturd-I-Floor 5-ply, plywood tongue and groove, Exposure 1, installed perpendicular to the WI Series joists with end joints centered over the top flanges of the joists and staggered. The plywood is nailed and glued with construction adhesive. The construction adhesive is applied to the top flanges of the WI Series joists using a single zig-zag, 1/4 inch (6.4 mm) diameter, bead. Double beads are applied at joints and a bead of adhesive is applied to the tongue and groove joint. The plywood is nailed, using 8d ring- or screw-shank nails at 8 inches (203 mm) o.c. maximum at supported panel edges and 12 inches (304 mm) o.c. maximum at intermediate supports. Joist spacing shall not exceed 19.2 inches (487 mm) o.c. when this floor system is used. Structural Wood Members - Georgia-Pacific WI 80, WI 80A, or WI 85 Series joists, minimum 9.5 inches (241 mm) deep, spaced at a maximum of 24 inches (610 mm) o.c. (maximum 19.2 inches [487 mm] o.c. when Flooring System No. 2 is used). Holes may be cut in web as permitted by this report. Minimum bearing on bearing plates is 2 inches (50.8 mm). Two 10d common nails are used to fasten the rimboard to the ends of each WI Series joist. Mineral Wool - 11/2 inch (38.1 mm) thick, 2.5 pcf (40 kg/m3) Thermafiber, is cut 201/2 inches (521 mm) wide and placed between the WI Series joists, over furring channels. Furring Channels - Resilient channels formed of minimum 0.026 inch (0.66 mm) thick galvanized steel. Channels are hat-shaped, 23/4 inches (70 mm) wide (face is 11/4 inches [31.8 mm] wide and each flange is 1/2 inches [12.7 mm] wide) x 7/8 inches (22.2 mm) high and are installed perpendicular to the WI Series joists. Channels are installed at a maximum spacing of 16 inches (406.4 mm) o.c., with a double row installed at gypsum wallboard end joints. Channels are secured to the WI Series joists with two 15/8 inch (41.3 mm) long #6 drywall screws at each joist (one in each channel flange). Gypsum Wallboard - Georgia-Pacific 5/8 inch (15.9 mm) thick Firestop Type C or National Gypsum Company 5/8 inch (15.9 mm) thick Gold Bond Fire-Shield G Type X gypsum board installed with long dimension perpendicular to the furring channels and fastened to each channel with 11/8 inch (28.6 mm) long Type S screws at 12 inches (304 mm) o.c. End joints are staggered 48 inches (1.22 m) on center (or 2 framing spaces when WI Series joists are spaced at 19.2 inches [487 mm] o.c.) Finishing System - (Not shown) - All joints are taped with a bedding coat and one finish coat of setting-type joint compound. The screw heads receive one coat of joint compound. 23

3.

4. 5.

6.

7.

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Figure 6 - ONE HOUR Fire Rated Floor/Ceiling Assembly

1.

2. 3.

Finish Flooring - 5/8 inch (15.9 mm) thick or thicker sheets of plywood or oriented strand board (OSB), manufactured with exterior glue having tongue-and- groove edges along the 8 ft (2.44 m) side of 4 ft x 8 ft (1.22 m x 2.44 m) sheets, installed perpendicular to the WI Series joists with end joints centered over the top flanges of the joists, and placed so that the end joints are staggered. The application of the plywood or OSB shall comply with the specifications and recommendations of the APA. Joist spacing shall not exceed 19.2 inches (487 mm) o.c. when using 5/8 inch (15.9 mm) thick plywood. Structural Wood Members - Georgia-Pacific WI 40, WI 60, WI 80, WI 80A, or WI 85 Series joists, minimum 9.25 inches (235 mm) deep, spaced at a maximum of 24 inches (610 mm) o.c. Holes may be cut in web as permitted by this report. Minimum bearing on bearing plates is 2 inches (50.8 mm). Gypsum Wallboard Ceiling - Two layers of proprietary Type C gypsum wallboard shall be applied to the assembly. Each sheet shall be a minimum of 4 ft (1.22 m) in width. The gypsum wallboard attached directly to the I-joists shall be installed perpendicular to the joists. The ceiling shall be constructed as follows: Wallboard Layer 1 - The first 1/2 inch (12.7 mm) thick layer of Type C gypsum wallboard shall be attached directly to the bottom flanges of the WI Series joists using 11/4 inch (31.8 mm) long Type S bugle-head wallboard screws spaced at 6 inches (152.4 mm) o.c. along wallboard edges and 12 inches (304.8 mm) o.c. in the field. Wallboard end-joints shall be centered on the bottom flanges of the joists and staggered. The minimum end distance (distance in from the 4 ft [1.22 m] end of wallboard, i.e., butt end) allowed for the base layer is 1/2 inch (12.7 mm). The minimum edge distance (distance from the 8 ft [2.44 m], 10 ft [3.05 m], etc., side of the wallboard) is 1 inch (25.4 mm). Wallboard Layer 2 - The second 1/2 inch (12.7 mm) thick layer of Type C gypsum wallboard is attached directly through the first layer of gypsum wallboard into the I-joists with 17/8 inch (47.6 mm) long Type S screws at a maximum of 6 inches (152.4 mm) o.c. The end joints of each gypsum wallboard shall be offset a minimum of 24 inches from those in the first layer. The minimum end distance allowed is 1/2 inch (12.7 mm). The minimum edge distance is 1 inch (25.4 mm). All screws shall be set so that they are flush with the face of the wallboard and do not damage the core of the wallboard. The following gypsum wallboards are permitted in this assembly: - Canadian Gypsum Co, Ltd.: Type C - Celotex Corp.: Type B, C, FRP or SF3 - Domtar Gypsum: Type C, S - Georgia-Pacific Corp., Gypsum Division: Type GPFS1, GPFS3, GPFS-C - Gold Bond Building Products: Types FSW-G or FSK-G - James Hardi Gypsum: Type III - Pabco Gypsum Co.: Type C, PG-3 or PG-C - Republic Gypsum Co.: Type RG-1 or RG-3 - Temple-Inland Forest Products Corp.: Types T, VPB-Type T - United States Gypsum: Type C, D, or IP-XZ - Weyerhaeuser Co., Gypsum Division: Type DPG2 or DDDG3.

4. 5.

Wallboard Screws - shall be type S bugle head screws that are self-drilling and self-tapping. Screws shall meet ASTM C 1002 or ASTM C 954 requirements. Finishing System - (Not shown) - The face layer joints shall be covered with tape and coated with joint compound. The screw heads shall also be covered with joint compound.

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Figure 7 - ONE HOUR Fire Rated Floor/Ceiling Assembly

1.

2. 3.

4.

Finish Flooring - nominal 23/32 inch (18.3 mm) thick or thicker sheets of plywood or oriented strand board (OSB), manufactured with exterior glue having tongue-and- groove edges along the 8 ft (2.44 m) side of 4 ft x 8 ft (1.22 m x 2.44 m) sheets, installed perpendicular to the WI Series joists with end joints centered over the top flanges of the joists, and placed so that the end joints are staggered. The application of the plywood or OSB shall comply with the specifications and recommendations of the APA. A lightweight concrete topping may be applied over the plywood or OSB. This topping shall be 3/4 inches (19.1 mm) or thicker, following the architectural specification and topping manufacturer’s instructions. Structural Wood Members - Georgia-Pacific WI 40, WI 60, WI 80, WI 80A, or WI 85 Series joists, minimum 9.25 inches (235 mm) deep, spaced at a maximum of 24 inches (610 mm) o.c. Holes may be cut in web as permitted by this report. Minimum bearing on bearing plates is 2 inches (50.8 mm). Furring Channels - Resilient or inverted hat-type furring channels are placed below the WI Series joists. Channels are formed of minimum 25 gauge (0.0247 inches) (0.63 mm) galvanized steel and installed perpendicular to the WI Series joists. They are typically 21/2 inches (63.5 mm) wide at the base, 11/2 inches (38.1 mm) wide at the face and 1/2 inch (12.7 mm) deep. Channels are installed at a maximum spacing of 16 inches (406.4 mm) o.c., and attached to each WI Series joist with one 17/8 inch (47.6 mm) long Type S drywall screw. Gypsum Wallboard Ceiling - Two layers of proprietary Type C gypsum wallboard shall be applied to the assembly. Each sheet shall be a minimum of 4 ft (1.22 m) in width. The gypsum wallboard layer attached to the furring channels shall be installed perpendicular to the furring channels. The ceiling shall be constructed as follows: Wallboard Layer 1 - The first 1/2 inch (12.7 mm) thick layer of Type C gypsum wallboard shall be attached to the furring or resilient channels with 1 or 11/4 inch (25.4 mm or 31.8 mm) long Type S screws spaced at a maximum of 8 inches (203.2 mm) o.c. The end joints of each gypsum wallboard shall be centered on the furring or resilient channels. The minimum end distance allowed is 1/2 inch (12.7 mm). The minimum edge distance is 1 inch (25.4 mm). Wallboard Layer 2 - The finish layer of 1/2 inch (25.4 mm) thick Type C wallboard shall be attached directly into each furring or resilient channel with a 1-5/8 or 17/8 inch (41.3 or 47.6 mm) long Type S screw that passes through the wallboard layer 1. The screws shall be spaced at a maximum of 8 inches (203.2 mm) o.c.. The minimum end distance is 1/2 inch (12.7 mm). The minimum edge distance is 1 inch (25.4 mm). The end and edge joints of the finish layer of gypsum wallboard shall be staggered a minimum of 24 inches (609.6 mm) from the joints in wallboard layer 1. The end joints in the face layer shall be centered over the furring or resilient channels. If this is not the case, end joints shall be attached to wallboard layer 1 with 11/2 inch (38.1 mm) long Type G screws spaced at a maximum of 8 inches (203.2 mm) on center with an end and edge distance of 11/2 inches (38.1 mm). All screws shall be set so that they are flush with the face of the wallboard and do not damage the core of the wallboard. The following gypsum wallboards are permitted in this assembly: - Canadian Gypsum Co, Ltd.: Type C - Celotex Corp.: Type B, C, FRP or SF3 - Domtar Gypsum: Type C, S - Georgia-Pacific Corp., Gypsum Division: Type GPFS1, GPFS3, GPFS-C - Gold Bond Building Products: Types FSW-G or FSK-G - James Hardi Gypsum: Type III - Pabco Gypsum Co.: Type C, PG-3 or PG-C - Republic Gypsum Co.: Type RG-1 or RG-3 - Temple-Inland Forest Products Corp.: Types T, VPB-Type T - United States Gypsum: Type C, D, or IP-XZ - Weyerhaeuser Co., Gypsum Division: Type DPG2 or DDDG3.

5. 6.

Wallboard Screws - shall be type S bugle head screws that are self-drilling and self-tapping. Where needed, Type G wallboard screws shall also be used. Screws shall meet ASTM C 1002 or ASTM C 954 requirements. Finishing System - (Not shown) - The face layer joints shall be covered with tape and coated with joint compound. The screw heads shall also be covered with joint compound.

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