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wall.For direct attachment only to steel studs Item 2B)-Nom 5/8 in.thick lead backed gypsum panels with beveled, square or tapered edges,applied verticaNy.Vertical joints centered over studs and staggered min 1 stud cav�y on opposite sides of studs.Gypsum board secured to studs wth 1-1/4 in.bng Type 5-12 steel screws spaced S in.OC at perimeter and 12 in.OC in the field. RAY-BAR ENGINEERING CORP—Type RB-LBG 4E.WaN and Partition Faciegs and Aooessories*—(As an aRemate to Rems 4 through 40)—Nominal 5/8 in.thick,4 ft wide panels,applied verticaNy and secured as described in Item 4 SERIOUS ENERGY INC—Types QuietROCk ES,QuietRock 527. 4F.Gypsum Board•—(AS an aRemate to Items 4 through 4E)-S/8 in.thick,4 ft.wide,paper surfaced,applied vertically and secured as described in Item 4. CERTAINTEED GYPSUM INC—Type SilentFX 4G.Gypsum Board*—As an altemate to Item 4-Nom.5/8 in.thick,inner layer attached vertically to studs with 1 in. bng Type S steel screws spaced 16 in.OC in the field and abng the vertical edges.Outer layer attached to the studs horrzontaly over the�ner layer with 1-5/8 in.bng Type S steel screws spaced 16 in.OC�the field and abnq the vertical edges and 12 in.OC to the floor and ceiling runners.]oints of outer layer must be taped.Nom 3/32 in.thick gypsum veneer plaster may be app8ed to the entire surface of Classified veneer baseboard. PABCO BUILDING PRODUCTS L L C,DBA PABCO GYPSUM—Types C,PG-11,PGS-WRS. 4H.Gyrpcum Board*—(Not Shown)-(/Ls an akemate to items 4)For Direct Applicatan to Studs Ony-For use as the base layer on one or both sides of the waN.Nom 5/8 in.thick lead backed gypsum paneLs with beveled,square or tapered edges,appMed vertkaNy.Vertical joints centered over studs and staggered mh 1 stud cavity o�opposite sides of studs. WaUboard secured to studs w�th 1-5/8 in.bng Type 5 12 steel screws spaced 8 in.OC at perimeter and 12 in OC rc�the field.Lead batten strips requa�ed behind vertical joints of lead backed gypsum wal�oard and optbnal at remaining stud bcatans.Fasteners for face layer gypsum panels when instaped over lead backed board to be min 2-1/2 in.Type S-12 bugle head steel screws spaced as described in Item 4.To be used with Lead Batten Strips(see Item SA)or Lead Discs(see Item 6A). MAYCO INDUSTRIES INC—Type X-Ray Shielded Gypsum 4I.Gypsum Bosr+d*—(As an altemate to Rem 4,not for use with Rems 1C and 2C)-Nom.5/8�.th�ck gypsum panels w�h beveied,square or tapered edges nstaNed as described'm Item 4. CGC INC—Type ULX UNITED STATES GYPSUM CO—Type ULX. USG MElQCO S A DE C V—Type ULX 4l.Gypsum Board*—(AS an altemate to Item 4 when used as the base layer on one or both sides of waN.For direct attachment only to steel studs Rem 2B).Nom 5/8 in.thkk lead backed gypsum panels w�h beveled,square or tapered edges,appked vertkally.Vertkal joints centered over studs and staggered min 1 stud cavity on oppostte sides of studs. WaNboa►d secured to studs with 1-1/4 in.bng Type 5-12 steel screws gypsum panel steel screws spaced 8 in.OC at perimeter and 12 in.OC in the fleld.Lead batten strips required behind vertical joirrts of lead backed gypsum wal�oard and optanal at remaining stud bcatbre.Lead batten strips,min 2 in.wide,max S ft bng wkh a max thickness of 0.14 in. placed on the face of studs and attached to the stud w�h constructbn adhesNe and two 1 in.bng Type S-12 pan head steel screws,one at the top of the strip and one at the bottom of the strip.Lead d�,�ominal 3/8 n.diam by max 0.085 in.thick.Compression fltted or adhered over the screw heads.Lead batten strips and discs to have a punty of 99.9% meeting the Federel specification QQ-L-201f,G2de"C". RADUTION PROTECTION PRODUCi'S INC—Type RPP-LBG 5.Lead Batten Stripc—(Not Shown,For Use With Rem 4D)-Lead batten strips,min 1-1/2�.wide,max 10 ft bng w�h a max thkkness of 0.125 in.Str�s placed on the interbr face of studs and attached from the exterior face of the stud with two 1 in.bng Type 5-12 pan head steei screws,one at the top of the strip and one at the bottom of the strip.Lead batten strips to have a purity of 99.9%meeting the Federal speclRcatbn QQ-L-201f,Grade"C".Lead batten strips required behind vertical joints of lead backed gypsum board(Item 4D)and optional at remaining stud bcations.Required behind vertkal joints. SA.Lead Battan Strips—(Not Shown,for use with Rem 4H)Lead batten strips,2 in,wide,max 10 R bng w�h a max thickness of0.140 in.Str�s placed on the face of studs and attached to the stud with two min.1 in.bng min.Type S-8 pan head steel screws,one at the top of the strip and one at the bottom of the strip or wRh one min.1 in.bng min.Type S-8 pan head steel screw at the top of the strip.Lead batten strips to have a purity of 99.9%meeting the Federal specification QQ-L-201f,Gredes"A,B,C or D".Lead batten str�s required behind vertical joints of lead backed gypsum wallboard(Item 6 of 7 7/25/2012 2:52 PM