DlSPIHWJT OIBc'#)MJraCSni~6 BUREAU OF ^i'AiTDARDS

WA^t^GTOir

pf BMAXvilag Construotion' r»r^ to Hr a Rjgifel;a»c;i

Tha tyj>3S of oona-trWtion in uaa ars divided into grades andola»3008, djpdaoirig on 0X9 goniral aeaign. Within fjaoh grado orclass thara will ba a l8d*g3 in firo rasiatanoa, aapandingon tba datail 4 usod foiii. tha ijropai'tias of thd mtarials amploy'-

but aach ginda clasu is «q. ohojaan tlmt with t ha ernatsuitabla dWktariaXa o^a uatnlls it will uavalop & higher dagraaof rasistanoa tha suoeaadiag grade or class.

By fira resiatauci is meant tha ability to withatand fire dx~ppsura fros; .vithou^ fire ivithin, with no oollapsa and »3iai-KUSi amount of da^sag#^ also such properties as tend to |:r eventstarting. and spisad of fire within, ana also such as will eoahetha building a fire barrior in oaaj of a general conflagration.

Ctraida A

This gprade has solid, inoombuatible, fire resistive exterior,party, fire, and division walls, incombustible solid or hollowroom and corridor partitions, and solid, inoombustibl 3, fire re-eistlvd floor aa^ roof canstruotlon* Walls stay bo furrod andoiilingo may bo Ouspoaded from the floor construction when de-six 3d, uoidet, inoombuetible aatjxials

The floor loado tnay be supported on bwing walla or wall andfloor loads ^ay be supported toy prot jcted rolled ^rteel, oast ironor reinforced concrete fraiaing. The wall laaterlal my ba brick,,Conor eta, stono, or e<iui valent ariiitho floor and roof mterialany inooabustlbl e mterial foriae^i in solid units or slabs thathas the necessary strength and fixe resiatance.

All vertical openings are to be siiitably eaolosod to preventpassage of fire.

Class 1 . - Buildi^'s in this class oonform with the aboye re-quirements and haws inooit;bustibia top or finish floors and roof,partition, 9upiiorta„ door and window fra;ass aiwl sash, with wiredglass except where there io no exposure from adjacent buildingsor occupancies whir^e plain glass my be used. Docora anu. shuttersmay be metal, hollo# or sSlld, or of wood metal covered, ^ereused in fire on vii^ision .rails, or where severe ^xtsrior or in-terior exposure is to be provided againist, they shall meet therequirements for fire uoora and shutters. Minor intarlor trinmay be of weed

.

^M8 3. - Biiildinga in this class conform with the ginsral

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L«ttar Circular 71 6 - 37 - 03 3

r dquir daonts for Qrado a&d jtiavo conbustiblo top or finishfloors, paxtition supports, door and window framos and sash,with plain {lass, sxc#pt iihsxe dxpoaurs froa adjaoant buildingsor oecupaneifS is to bs providsd for^ wh^ ths aininma prot3Ct~ion shall bs attal door and window fraaas and sash with wirsdglass, whara glass is usad> or ths openings my bs oomplstslyprotsotad by aatoaatlsally oparatsd shuttars*

1

Buildings is this grads havs hollow, incombustlbXs and fir arasistive sxtsrior walls and solid or hollow party« fir a and di~vision walls* Walls shall ba of such thioknssa and dsslgn aswill aast thai raqnir a>adnts of tha givan usa. Thsy my ba ofbriok, firs rasiative hollow tils« conoxata blocks or unite,slabs cast in plaos with an air spacs, or aquivalant. Tha floorand roof oonstruction aay ba solid or hollow, cast in placa orbuilt of units* Other ganaral features are ths same as for(^ads A*

Class 1 * ~ Tha details ars ths same as for Class 1, Grads A*

Class 3 * - Tha details are the same as for Class 3, Grada A.

Grade C '

Sxtsrior walls are hollow or solid and consist of inoombuati-bla framing ozx which inoombustiblt^ lath and plaster, shaat matal,or otn.3t inoombustibla sheathing is applied. Party, division andfirs walls nay bs solid or hollow walls of the types describedunvxsr Grades A and B, or of the aa^-ve type as tha exterior walls,provided they are aada adequate for tha givsn usa.

Ths floor and roof cjnatroution has inooLibustibia framing, thestructural portior^ baing of incombuotibla matarial, and may bebuilt hollow or solid*

Class 1. - All metal fraining, sheathing, anv. structural msi&-toers have protection equivalent to not lass than ona-inch plas-ter on raetal lath. Other details same as for Class 1 of Grade A.

Class 3 . - All metal franrlng, sheathing, a*;! structural mem-bers have protection iquivalent to not less than one-iuch plas-ter on metal lath. Other details same as for Class a of Grade A.

Olass 3 . - Metal fraud ng, sheAthing and structural members areunpBoteoted* 0ta«3r details same as fox Class 1 of Grade A.

Class t . - Metal fratning, sheathing and structural members areunprotdoted. Other details axe the same as for Class 2 of Grade A*

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3L attar Circular 71 3-37-33

Grade D

Builillng(» in tms grad* have aolid or hollow axtarlor^ diirislon»ptiStf and fire waULls of inoombaatihla and fire rasiativa as watar-ial. WaXlfl au»t be of design and thiokness to meet the reiiuire-aents of bhe intended usa^ and m&y be of briok^ hollnw tile, con-crete block, or eiui valent. Tie floor and interior oonetructionconelate of solids heavy tio^ber frax^ing, supjportlng solid heavywooden floor and roof built without oonoealed air spaces. Metalfratoing where used shall be properly proteoted* hayera of asbes-tos or other inssabustibla felt are to be placed between the fin-ish and structural floor. The roofing is to be of incombustibleor fire retardant type. Partitions ^y be of solid timber, plasteron incoabustible lath and studs« or equivalent. Door and windowfrai^es and sash nay be of wood with plain glass, srcept where ex-posure fro.xi adjacent buildings or occupanoiss is to be providedfor, when the minimum protection shall be inetail door and windowfraiaes and sabh with wired glass, where glass is used, or the open-ings roay be oonpletely proteoted by automtioally operated shutters.Doors may be of wood except where used in lira or division walls,or where severe exterior or interior exposure is to be proviued for,whan they shall neat the requirements for fire doors or shutters.

All vertical openings are to be properly enclosed to prevent passage of fire.

Class 1 . - Boildixigs in this class conform with the general xe-quixeaeats of Grads D, ana have all r.etal oomicotions between col-umns, glraers, beaiss ana walls properly protected or inads of incoiii-

bustible fire rtaistiva material.

Class 3 . - The buildings oonform with the general requirementsand have exposed metal connections between oolumn^, girders, beams,and walls.

Grade E

Buildings in this grad* have solid or hollow exterior, division,1 party, arid fire wallc of incombustible and firs resistive material.

: falls must be of drsign and thickness to meet the requireaients of

y the intended use, and tr^y be of brick, hollow tile, concrete block,4 or equivalent. The floor and interior oonetruction consists oflight wooden framing with facings forming an air space between them.Suitable protection must he applied over and around heating plants,rooms used fox fuel storage, ox similar occupancy, and separationsprovided between chimnsya and the wooden construction. Door andwlndof frames and sash may be of i;vood with plain glass except whereexposure from adjacent buildings or occupancies is to be providedfor. When door and window frames and sash shall be of natal withwired gp.as8, where glass ia used, or the openings may ba coiapletelyproteoted by automatichlly opeiatad shutters. Doors may be of woodexcept where used in fire or division walls, or where severe

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Olrtmlfitf 71 6-37—33 4

axtsrtor or Int^ior »xi>oiiurt Is to ba i^roviaati for, tbay0ball aiot tho roiiUlrtaaBta for flro doors.

Class 1 . - Confer fiiS «itb ths gsaaral roqulrsmsnts of (^ac\o 2and has interior finish of piaster on Inoorabuatibls lath or squi-val^nt, and iuoombustibld or fira ratandant roof oonring, all

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> hollow Spaces being fire stopped at floor and roof lines with In-conbustible mterlal.

^’^ilass 3> - Conforms with the general reiuireaeats of Grade Sinu naa interior finish of plaster on wood lath, gypsm wall board,

i or equiwalent, and has inooabiistlble or fire retardant roof cover-ing, all hollow apaoes being firs stopped at floor ana roof lineswith Inoozsbuatible material.

Glass 3 . - Conforms with the general requirements of (Srade Sand Ws interior finish of plaster on wood lo.th, gypeun wall board,Oi: er^uivalent, and combustible roof covering, all hollow epaoesbeing fire stopped at floor auad roof lines with 3-inoh plank orequivalent

•

Classy, - Conforms with the general requlceiajnts of Grade Sr and has interior finish of wood, pulp board, or siidlur ooiabuotibleV material, and combustible roof covering.

Grade ?

- Buildings 1» thlb grade have exterior wall framing of wood faced**^on tha outside with msonry veneer, stucco or similar inoo'^buatibleft' mat 5riai . -Party, division, and fire vmlls atre to be of solid orhollow masonry or equivalent inoombustible anu fixe resistive con-

i

struct ion of design and thickness to meet the required use, except: that for double residenoes party or division walla stiay be of woodor metal studs with nate^ lath and plaster. Boors, frames and sash

f may be of wood with plain glass, except ns used in perty, division,and fire itella, when they shall be of desi^pi and ^-aterial to pro-perly >aroteot the opening.

The iHilife inter it» construction is of wood stud and joists withI; hollow spaces between facings. Suitable protection must bo appliedf ovex and around heating plants, rooms used for fuel storage, oraindlar oooupanoy, and sapaiation provided between ohimnjys and thewooden construction.

Class 1 . - Oonforns with the general requirements of Grade F and> has Intel ior finish of plaster on incombustible lath or equivalent,anw inooabustible or fire retaroant roof covering, ail hollow spacesbeing fire atoppjd at floor aad roof lines with inco’Tibustibla mater-ial.

Stuoco, if used, is to be on inoombustible lath.

Class 3. - Conforms with the general requirements of Grads F aadhas interior finish of plaster on wood lath, gyr'sum wall board, or

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Stucco^ if id to ba on inoomjju&tibl^ lath.

Claao ^ ~ OcnforiTiO with th3 ^m^r&X r ^siuir .^ssi^ntdi of Ch'ada ? andbad iut^rior ii»i»h of plaat^ on wood lath, p’psuM wail board, ord^ulval'snt, and ooBtoustibl^ roof ooT^rl/ig, all hollow spao^a baingfird wtoppod at flow anO roof linos with 3*iach plejtik or va-lent.

r^tuooo, if used, ssay b» oa wood lath.

Claws 4 . - Conforms with tho gfndxal r of Grade T andhas Interior finish of wood, pulp board, or eiedlar ooabwitibls m-tarlal, and oOKbusttble roof ootaring.

Stucoo, if used, »a.y be os wood lath.

fe^ada G

Buildingii of this grado have iscterior vmlX fra;^ng of wood facedOfi thj outside with boards or other coabustlble finish. Party, di-vision, and fire walls aae to be of solid or hollow msonry oreq^tiivalent incombustible aiid fii"5 resiBtiv’i construction of designmd thickness to weet tha required except that for double reo-iienoes party or division wallei m>y be of wood or .actal 4twa withaotal lath and plastt^r • Doors, frames, BrSuX nosh my be of ’^oodfith plain glass, except as used la party, dlviaion, aaa fire walls,when they shall be of design and isateriai to properly Jjrotiot thee|t9ziiiig^«

The interior ooziistruotlon is of wood stud and joists with the hol-low space between facings. Suitable protection must be applied over

!and around hsiatlng plants, room used for storage of fuel, or similaroecupaiioy, and separation irovided between chlmeys ana tue woodenteBStTuotion.

Claes 1 . - Conforre with the general requirefajtnts of Caraae Q asad

bae interior finish of plant.»r ou inoombustlble lath or valent,I i tad incombustible or fire retardant roof cov^’lng, all hollow spaoesI

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being fire stopped at floor aa. roof lines ^ith incor/ibuslibla mterial.

Oloss 3« - Ooftfor*^ with the general requirements of Grade G andbos interior finish of plast^^ on wood lath, gypsum wall booru, orequivalent, and ha# incombustible or fire retardant roof ooviring,

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oil hollow spaces bfing fire stopped at floor and roof lines withInoombui^tible matex ial.

Class ^ . - Ocuforns with tne general r equir ensenta of Grade 0 and:

has int erior finish of plaster ou wood lath, gypsum wail boai d or

^tqulvalent, and oofsbustibla roof aovexlng, all hollow spaoes beingfir a iJthpped at floor ana roof lines .<lth S-inoh plank ©r equivalent.

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Claaa 4. - Ctonforms with the general requirements of Cbroan G andhas intex'ior finish of wood, pulp board, or similar combustlbla mat-

Iirial, and ooabustlbls roof covering.

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