Document n9OEmwNxd20rYM9g9yRGq3262

GEORGIA-PACIFIC CORPORATION BESTWALL GYPSUM DIVISION August 30, 1966 TO: ALL REGIONAL SALES MANAGERS General Sales Bulletin # 60-66 ALL AREA SALES MANAGERS SUBJECT: SUSPENDED CEILINGS WITH FIRESTOP ALL SALESMEN RE: DISTRIBUTION DIVISION SALES PERSONNEL BY: Incombustible Assemblies 1 and 2 Hours G. C. Moore:jw CC: R. I. Fredericks, Paoli K. A. McCaskill, Paoli M. M. Powers, Paoli From the results of a fire test that was sponsored by the Gypsum Association and conducted at the Underwriters' Laboratories, Inc. in January 1966, Bestwall Gypsum Division may now promote all Bestwall incombustible floor and ceiling construction assemblies with a 1-hour or 2-hour fire resistive rating with "Firestop" (1/2" or 5/8") direct attached or suspended and screw attached to metal furring channels. Thedassemb1v was constructed to duplicate a floor and ceiling Design No.63 2-hour, except the"ceT1tn'g-was-..s.uj5i5ended with 1-1/2" cold rolled channels 2` O.C. on 18 gauge'gal van i zed steel wl r'6 hangarsfrom... the bottom chore}..of'"`^tee 1 bar joists. 25^gauge furring channels, 2' O.C. were double wire tied at r i,gh.t,..angl es to the coTd"'`roT16d'Chatine 1 s . One layer of 5/8" Type "X" gypsum wallboard was screw attached to,,.the furr 1 ng channels. The joints were t^ped-and**fl.R4,shed i n^_t]ie--e'OnVS'nt] ona 1 manner. The object of this test was to prove the fire resistive classification of a floor and ceiling assembly with a gypsum wallboard ceiling would be equal whether the board was applied directly to the bottom chord bar joists or suspended below. Underwriters' Laboratories will show the approval of the following Bestwall floor and ceiling assemblies for use in suspended or direct attached assemblies in the 1967 U. L. Building Materials List and immediately on revised Guide Cards for Bestwa11. UL #2 - I Hour UL #19 - 1 Hour UL #17 - 1-1/2 Hours UL #13 - 1-1/2 Hours UL #237 - 2 Hours UL #69 - 2 Hours Inform your contractors, building officials, of another method of constructing a suspended fire rated floor and ceiling with Bestwall "Firestop" gypsum wa11 board. SGP 0025656 PAOLI, PENNSYLVANIA TO: ALL REGIONAL SALES MANAGERS ALL AREA SALES MANAGERS ALL SALESMEN DISTRIBUTION DIVISION SALES PERSONNEL BY: C. E. Abbey:jw CC: R. I, Fredericks, Paoli K. A. McCaski11, Paoli M. M. Powers, Paoli General Sales Bulletin #58-66 August 12, 1966 SUBJECT: FIRESTOP RE: FIoor and Ceiling Assemb1ies FILE: Wallboard Manual - Section 5 (C) Firestop Forwarded herewith is a copy of a two-page folder distributed by the American Plywood Association in their "Concepts" series which are sent to architects all over the country, as well as to a wide distribution to people in the building field. This is identified as No. 112 "Fire Resistive Plywood Floors and Roofs". Please review the material carefully. It summarizes the many floor and ceiling assemblies in which Firestop can be used with plywood. Study each of the six assemblies carefully. Bear in mind that Bestwall's Firestop, 1/2" thick in some cases and 5/8" thick in other cases, can be used where the fire rated board is shown. Notice Figure 2 shows a mineral acoustical ceiling tile assembly which is not applicable to gypsum board products. The American Plywood Association is obtaining building code approvals of these various assemblies with their plywood. We have obtained approvals of many of the floor and ceiling assemblies with Firestop. Underwriters' have changed the listing of various approved 1 hour floor and ceiling assemblies which Bestwall has tested in the past with conventional wood finished floor over wood sub-flooring and broadened the approval to include plywood. Use the No. 112 "Concepts" as a ready reference to sell Firestop in the various floor and ceiling assemblies detailed. Enel. SGP 0025657 FROM THE AMERICAN PLYWOOD ASSOCIATION / FOR ARCHITECTS / ENGINEERS / BUILDERS NUMBER 112 FIRE RESISTIVE PLYWOOD FLOORS AND ROOFS NEW PLYWOOD CONSTRUCTIONS RECEIVE ONE-HOUR FIRE RATINGS A wider selection of one-hour rated plywood systems is now available to architects and engineers. This means that economical plywood construc tion can be used in larger commercial buildings. Plywood stressed skin construction is included in these one-hour systems for the first time. Plywood is now shown in 25 one-hour assemblies in the Underwriters' Laboratories "Building Materials List." Several of these are illustrated on the following pages. Ceilings are the primary variations in the other plywood assemblies listed. CONSTRUCTIONS RECOGNIZED BY BUILDING CODES The listing of these plywood assemblies is based on fire tests made at Underwriters' Laboratories in accordance with the Standard Fire Tests for Building Construction (ASTM El 19). All major building codes (Uni form Building Code, Basic Building Code, Southern Standard Building Code and National Building Code) accept fire tests made in accordance with these tests. Many building authorities had already recognized plywood in one-hour rated systems -- the tests confirmed the adequacy of these constructions for this rating. The constructions listed provide several choices for designers. Variations are generally permitted, but should be confirmed wifh local building officials. Designs shown in the "Building Materials List" are referenced to serve as a guide for modifications. ONE-HOUR CONSTRUCTION PERMITS AREA INCREASES SGP 0025658 With one-hour construction, larger buildings may be built with plywood. Since plywood construction is commonly the most economical building method, this can save you money. Consider a one-story school built outside the fire zone under the require ments of the Uniform Building Code. Where the school was built with one-hour frame walls and a one-hour plywood roof, each building could have an area of 15,700 sq. ft. between fire walls. The same school built outside the fire zone under the requirements of the Basic Building Code could have the following areas when separated 30 ft. from other buildings. With one-hour frame walls and a plywood roof, maximum area is 15,300 sq. ft. per building. (When each classroom exits directly to the outside, this increases to 45,900 sq. ft.) When of Ordinary type construction with a one-hour plywood roof, maximum area is 20,000 sq. ft. per building. (When each classroom exits directly to the outside, this increases to 60,000 sq. ft.) PLYWOOD QUALIFIES FOR HEAVY TIMBER ROOF CONSTRUCTION Heavy timber construction is one of the oldest types of construction used in this country. The excellent fire endurance of this type construction has been demonstrated over a period of many years. Now lVs" plywood can be used for roofs in the Heavy Timber classifica tion. This makes this type construction even more economical and useful. Plywood's use in this type construction is illustrated on the back page. Additional information available from the American Plywood Association / Tacoma, Washington 98401 Copyright 1964 American Plywood Association One-hour floor 2`4'1 is recognized in one-hour con structions because its IV$" thickness is equivalent to other recognized twolayer plywood systems. A gypsum board ceiling is applied directly to the underside of the joists in this system. One-hour roof This same construction is recognized for one-hour roofs. References ICBO Research Recommendation 1007.9. -- lVe" T&G 2-4-1 plywood (b) / -4" beams or double 2" joists (spaced to 48" o.c.) //r-W galv. metal furring strips at 24" o.c. (Maximum span of furring strips is 48") .Va" fire resistive gypsum board-- / fasten to furring strips with self-tapping screws 12" 0 c Figure 5. One-hour assembly -- V/e" plywood with beams 48" o.c. One-hour floor lVe" 2-4-1 over beams 48" o.c. and %" fire resistive gypsum board are the basic elements in this one-hour con struction. The metal furring strips carry the ceiling across a maximum beam spacing of 48". One-hour roof This same system is well suited for one-hour roofs. References UL Design* No. 28. SGP 0025659 One-hour floor This plywood stressed skin construc tion is the thinnest one-hour com bustible assembly which has passed Underwriters' Laboratories tests. The layers of fiber insulation board and fire-resistive gypsum board are applied in the field. One-hour roof This same system is well suited for one-hour roofs. References UL Design* No. 47 (to be published in future edition of "Building Mate rials List.") MATERIAL REQUIREMENTS These materials are required in one-hour ply wood assemblies. Refer to Underwriter's Labora tories "Building Materials Lists" if additional information is required. a. Subflooring - Minimum V2" DFPA CD with Exterior glue plywood. b. Subfloor-Underlayment - V/e" tongue-and- groove DFPA 2*41 with Exterior glue plywood. c. Underlayment - Ve" tongue-and-groove DFPA Underlayment grade plywood. d. Stressed Skin Construction - We" DFPA CD with Exterior glue plywood glued to mini mum 1200 psi 2 x 6's at 12" o.c. Fabricate in accordance with American Plywood Asso ciation Fabrication Specification SS-8. One-hour floor A conventional plywood floor combines with fire resistive gypsum board in this one-hour rated assembly. Acoustical tile ceilings supported on splines can also be used. One-hour roof Most codes do not require the top layer of plywood and building paper when this assembly is used for onehour roofs. References UL Design* No.'s 25, 33, 34, 41 (Gypsum board ceilings.) UL Design* No.'s 9, 12, 15, 16, 20, 38 (Acoustical tile ceilings.) One-hour floor Mineral acoustical ceiling panels are suspended below a conventional ply wood floor in this one-hour construc tion. A T-bar grid suspension system carries the 2' x 4' acoustical panels. One-hour roof Most codes do not require the top layer of plywood and building paper when this assembly is used for onehour roofs. References UL Design* No.'s 17, 21, 22, 23, 27, 30, 31, 36, 37, 39. Figure 1. One-hour assembly -- resilient channel ceiling system. One-hour floor %" gypsum board is attached directly to the underneath side of the joists in this construction. Similar construc tions with 5/s" plywood subflooring and V2" plywood underlayment have been widely accepted for years because of similarity to other rated systems. One-hour roof Most codes do not require the top layer of plywood and building paper when this assembly is used for onehour roofs. References UL Design* No.'s 1, 29, 42. Note: This construction is also recognized for 45 min. assembly (UL Design* 1) and 30 min. assemblies (UL Designs* 1 and 2) with a V2" or less gypsum board ceilings. See Underwriters' Laboratories, Inc. "Building Materials List" Class E-l designs. Figure 3. One-hour assembly - ceiling attached directly to joists. SGP 0025660 HEAVY TIMBER ROOF CONSTRUCTION Most building codes include a type or classification of construction referred to as "Heavy Timber." In this type of construction, fire resistance is attained with extra thick materials (codes specify mini mum thicknesses), construction details, avoidance of concealed spaces, and other factors. Heavy Timber type construction is widely recognized as comparable to one-hour constructions. Full scale fire tests have shown that lVs" 2-4-1 plywood provides the same good performance as nominal 2" tongue-and-groove lumber decking. See Figure 7. For this reason \y%" plywood is rapidly gain ing acceptance for Heavy Timber roof construction. The Uniform Building Code recognition of tongue-and-groove 2*4*1 in this appli cation is one example. (Research Recommendation No. 1007.9.) For More Information Write American Plywood Association, 1119 A Street, Tacoma, Washington 98401 for Plywood Constructions Systems, Form No. 65-310. This 48-page guide shows how plywood is used for roofs, walls, and floors in commercial and industrial buildings. It is a new publication first released in December, 1965. SGP 0025661 AMERICAN PLYWOOD ASSOCIATION