1002-40-10521 June 17, I960 6874

FIRS Sl'IDURANCE TEST OF

PREFABRICATED ROOF PANEL

by

E • Iv • Bender

J • V. Ryan
r

^4- V

Q(3QI 5^1 ©ntfl# IS^01-04i-S00I

‘50 T3ST aoMuans mi%

JSMSi '500E aSTA0IEaA'5SK5

Tis&xisE »w

T

-4

-A—,. ^

I - r

^ (V* - it

n

i

* ^
Fim ENDURANCE TEST OF

PREFABRICATED ROOF PAIIGL

by

E. Bender

J, V. Ryan

ABSTRACT

A fire endurance test was made on one roof

specimen, representative of prefabricated construction for use in very cold climates. Screvjs and

washers were used as a means of prolonging the

retention of gypsum board on the fire exposed surface. The fire endurance of the specimen'll^ ^0

minutes.

1. INTRODUCTION

At the request of the U. S. Naval Civil Engineering Laboratory, Port Hueneme, California, and Headquarters, U. S.

Mr Force, a test was conducted on prefabricated panels

representative of a roof construction. This construction

v;as designed for use in polar regions.

2. SPECIMI

Ihetest specimen was assembled from prefabricated panels.

Bach panel consisted of a wooden frame and a resin impregnated

paper honeycomb insulation with a metal skin cemented to each

face. The individual panels locked together to form the

specimen.

The specimen was made by assembling the panels as received.

No extra panels were available for disassembly and detailed

examination. Therefore, the description is based in part on

the representations of the designer, some of which could not

be checked during examination of the debris after the tests.
10 Teri SDREAauaHK laii

dSTHAl ©Oit amAOimAma

zebtiQtf. *W *,S

XIB-^i .? -*X

iO.AHTBHA

lood' 9Xio aq aBvx ass.'t assfts’sj.Trofx^ A

-op^:XBtioo £»ev^BqATQ'Bl9tq ; lc ^nmmqpt ^.ttealosqa Mb i?.mroZ bloo 'x‘^m nl aax/ lol

sri^ xp-^'S^^oIo'iq lo anssai b sb xieat slew a-xoriaBw

“-‘XxrB' t\©jar|%a 9^11 gxi j- ,|)^xsod' jKj/acr^^ Iq

Ci^ l^^hamloaqa edX to &DnBWba& eiiH >.9ob1

ICITOBCIOHBII .1

"dB'i s^-i^‘2:£>e£ti;8xxl IxviO XbvbM *8 *U ©rid to dsawpa-x 9fl.t jA

,8 *l jexqdxBs/pMsK ferxB ;fix.cxxali;lBO dxo'-I ,-t'^odBxo

slaxiBq BsdBDX'tclBlexq no ho^oubHoo sbvs- b ^©oxoi xli>.

noidoi’JxdBrxoo alrlT ^iioAdoxrxcraiioo loox b to svldBdxieaexqeT

.Sfiolsox XBfoq ill ofsif tot sbw

dOllOSia ,£

»BlexiBq bed'Bo.txdB'iexq mott bsXdir*BaaB bbw xis>ffii;.oeQS dasdeiic

i!)edBix§exqffli. nias-i b .to naboow b lo ijodaisnoo I©xiBq rfoBli'

sioBc od I>edn9is©o .axiE iBddiS B.ridivx noldBijjani d'isoo'^anoxi xaqsq

Bxit laxoi ot tetiXe^oS b&iiool alosmq iBi/blvibal edT -oobI

*iiS£fU09qs

^bovleoBt as aleriBq ©xid ^dldweasB -^d .s£iBsa sbv/ nmloBqa odT

beilBteb Mb '^Idja^aaBaAB lol ©XdeXlBVs otew alemq BtSxe oH

xio dxBq nl boBBd ax aoltqttoaeb eiid (©xolexMT .noXdsislriiixx©

Jcii blxroo dolirw lo offioa ^torrgxaob ©lid lo anoidBjnoaoTqsx ©rid

»sdssd 9x1 -j iBXtB aXtdob edt to xioxdsmlmBXB ^Itub Peiosjdo ecf
2

The specimen was 16 ft long hy about 12 ft 6 in. wide,

made up of three roof panels, marked R2, plus an angle panel,

marked Rl, for transition from roof to side wall. The R2

panels were 16 ft long, in. wide, and 4-9/16 in. thick;

and had perlite fill in the honeycomb. The panels were

received with a preapplied rubber, or rubber-like, roofing

of .068 in. thichness.

After assembly of the panels, gypsum boards were applied

to the underside of the roof deck. The area was divided

approximately along the Sast-West centerline (along the short

dimension of the furnace and transverse to the prefabricated

panels). In the north half , ^8 in. thick United States

Gypsum Company Firecode 60 W^lboard was applied as follows:

a full coat of Minnesota Mning and Manufacturing Company

adhesive EC1357 was applied and allowed to become tacky, the

board was then pressed against the deck and held there while

1 in. logg, no. 12 self -tapping sheet metal screws with 13/32 in.

diameter pan beads, and 3/4 in. od washers, were driven into

holes drilled through the gypsum board and lower metal skin of

the panels at l6 in. oc in both directions. The wallboards

were 4 ft wide and 8 ft long. The joints between butted ends

did not fall under the parallel joints between deck panels.

In the south half of the area, a two layer application was

made as follows: in. thick United States Gypsum Company

Firecode Boxboard, in V-edged sheets 2 ft wide and 8 ft long, was

was given a full coat of Minnesota Mining and Manufacturing

Company adhesive EC1357, the adhesive allowed to become tacky,

and the boards applied to the deck parallel to the joints between deck panels so that the latter joints were covered by

the Boocboard. Flat head i in. long, no. 12 self- tapping sheet

metal screws were driven (until the hea^fe were flush) into

holes drilled through the Boxboard and into the lower metal

skin of the deck panels at 2 ft oc along the centerline of

each sheet of board. The second layer consisted of 3/8 in.

thick United States Gypsum Sheetrock Gypsum Wallboard in 2 by

8 ft sheets. United States Gypsum Perf-A-Tape Joint Cement

was applied to the upper surface with a trowel having , notches

that left lA in. strips of cement at 2 in. oc. The board

was immediately applied transversely to the first layer. The

butt joints did not fall under joints between the Bogcboard or

the deck panels. Holes were drilled through both layers at
.cb..... -ii; SI jrrCilG vj gnoX oi sbw XA0ii:i;oona siiT

.iori^v, 'I^xcs fiB ;.:bu.-: Iccli^s ^glexiBq iOO'x eoiiil 'lo qB SB'--Jii S}i .?rh , Lliiw slla ol loo'X ^iioxi rioxilo'XXB-rd “icx .1,1 /jejlTsi;:

qlniiiil <.xl 'UXr—r^ Ills ^sLxv; -..al -fM ^gxtol 11 p>’'ie\: al0f::.:q ^ .1. X"* ! ., .-L. X--''- ' 1 I .cmoi>y;cxior{ arid ni lilt s.d’il'ipq bsd bnx

.^iXitoo"-: ,9XiiI-xcuc:x'i xo ^ xMcii/x bfJXlcxqBs-iu b .o.JXu bevXeoex

,x£0iiiloi;xio' »ni: uoO . lo

le-xl .'MB xIxBoc’' xiXBqvv jal^nx-q odd' lo vicfcieasB 'lottl

::,xxLvII eav. ell ,dj 05 Icox c:lt to ^bxc'iexnf; -^Id- oI

^‘Xvde 0: 1

' •r'nxlx'-fcxx cry 3W-'Ie,..^gj 0 fid' giiclx q.Cr jjoxrIxuxcqB

XXjC^I XC'XXX'XX ?ffj ox 0O'IO--7-S.r!:BXo DjOH OO.SXl'x!L‘i 0riv to I-OXEaOflXb'

aodxojc’ ,l 0 OX:iT' :x.:j:.I:i ,oI /xX..:];: illxor: s.dcr xol ^CaloriBx

:;avo.;Ilox ao x'Xiyqs ax%v ^xbogIIbo Id oXooo^ixu 'iXioxiisoO xx'oqqC

0.rx,:-;X.oX g.oxT!:roootrxxBH bnB ^xtltiiXi oIOBSiiniM lo Iboo IXul b

o:i;j o-'iDBO otscaoX o-j bsv/clla jjxxb belXqqs. bbo S'^£I0J^I ovxaorloB

olibi: B iodo blon XxiB XosX oXx Xoeaoxq iierfj xo' .b^iool

I- S£\£I X'.'X^ a^voxoa iBuens Jeo>l& grixt Xj--. • H^--X ^^O-L ^£i— X

oj.Qx n^rzt ex'^iv .B'le-xiCBO bo •at AC bxxB -sbi^ed x.isq xoIar.;iJ:.J:n lo uIxiB I-S+ox: I Ob ol Ins bxxoQ t;r:£q;qq, s:il rl^i^/o'iiid* XsXII'iX aolcd

oil . ortoxd'oo’rx5 lixod x:t oo *al ol jd alonxq odi

olx^s ootjr^cf ri;5ei;cr.'j ainloi; onx .^x^cl II X Lfra oXXv It oxov. .xlsiixq XooX Bsobled adoxoc IsIIoxoq oril x^bnx? IIoX d'ox: IxX

axi. ncxlBoilrqo xev;. I j;/! . : ^oexo oiiX lo lloii rioooB oil xo. qi.o'.qooO inoxcrvo, srig:-: jq i. voXiAb j|ox.Iw .x:i B\5 na’, olid ox elxs

^ :;:xoI lx --• ?;:ix ODXv lx I alooxio feo^x/O"! nx jbxBodoI ebooeixx

Xi'lxnTOBiXiXiBv' X;ix gnldo, :;ioaom:x;-i lo Ixoo Ilrjx x ifoviq 8->v

.qoool oxiGoecf ol Xsv, oXIb ovxadd oal ^S“^£IOJP ovxeedd xan’qjno'J

'-ou Bdic-b xXl Ou loIlBxxq ;i-ob oiil ol boxlqqs aXiBod o.dl baa

qd I'-xovoc -xo'. b.;.x.xcx ‘xo11x;I oil !- .11 ox aloxiBq doer rioooj

j-3.da galxqxl -lXo8 XJ. *on. «giicl ,xx I bxd did .'ViaccxqDcl 'xi-x oX'oJ; (I’aroll oxoi. ^iK^xod oil I_:xax') xovlxX ©xoo a\'DXO<^

Ids:-; Tsbol oil cdl aux a-xxodid. xmxI Xgaoiiildnlll’iX aelo:.

Ic oalX-xolnoo ctil ^:iq1b oo 11 S d Blonxq dod eitl lo r:l;x3

oil d's£ bo aolBl 3 iioo -xed-X bixooea -'IT *i>XBod lo ZeoiiH do..o

vx ;;i Ivr;,. odll-.'I :;;;q3q\>i .aOO’xledb Hiooq'^0 aolxld bo:i In*'^ loldj

irioaov) dlol. otiB x'xob. XiOaqYd aocrxld Jbdlxfio 1^. ’-

.. 'MOloii , -qAlxsa lAoxl X ilbli: soBlwe ’lO'qqiif ed:l cl xexxqqc axo

loxod' xdi -oc; -:ii S jx lner:30 lo aqlxla -xl h-\I llel Ix.-o

od . lovBi lE^il edl ol \IeB’-i0Vdx-£Bti ooilqqs ^dlBlIon d ob'C

• do '-qd- ol:! n0 O'i;led alfiioc Ilxd lo.x Lfifc ai'axot_ i’ll*!

li? ooe’qcl dlod li^rjo’iiil bdlloi,.; o*te\: selcux .alrixxq :io©o ool
- 3

•*

16 in. oc in both directions and 1-1/2 in. long no. 12 selftapping sheet metal screws, having 13/32 in. diameter cap

heads, with 3/4 in. od washers v/ere driven into the holes.

iill the exposed joints were given the recommended

treatment of joint cement, paper Perf-A-Tape pressed into

the cement and then a second layer of cement; sanded when

dry, given a thin coat of finishing cement, and sanded when

dry. The gypsum wallboard was then covered with a tv/o coat

application of Interior Semigloss Coating MIL-P-1/971B Ships

green formula 125, Stock No. GT b010-2<36-9090.

3. TEST M3TH0D

The floor furnace was designed in such a manner that

specimens must be built or assembled in the frame that is

an integral part of the furnace.

The specimen was l6 ft long by about 12 ft 6 in. wide

v/hereas the furnace frame was designed for specimens l8 ft

long by 13 ft 6 in. wide. This discrepancy made it necessary

to place supplementary steel in the furnace to support the

specimen. The supplementary steel provided bearing for the

long edge of one E2 unit, for both ends of all three E2

units and for the horizontal portion of both ends of the KL

unit. The fourth edge of the specimen, that edge of the R1

unit that would bear on wall panels in actual use, bore on

the regular furnace beariisg angles. This steel was protected

with metal lath and plaster which also sealed the joint between steel and specimen.

Temperatures were measured on the unexposed surface and

at the gypsum-deck interface, by thermocouples distributed

as shov/n in figure 1; and in the furnace chamber by thermocouples encased in porcelain insulators and iron pipes. The

furnace fires were regulated to provide temperatures as close as

feasible to those defined for the standai'd time-temperature

curve given in ASTM E-119, which includes 1000=>F at 5 min,

1300^F at 10 min, 155^°^’ at 30 min, and 1/00® F at 1 hr.

During the test, the specimen was subjected to an applied

load of 50 lb per sq ft of roof area. Vertical deflections

were measured at the center of the specimen.
' '

x"-- J. .c; X'ft.ft. .-:.ft ;ftV:

' ;.4 ft ft .'-ft, ft; y.B ; ft.ft : fttNcX

'•* •.•• 'X'-..

'• ft. :'

-ft" .ft.;.. .;£9-y,cxi!

.?.- ft .fXft ac'V

I. vft.i I: txxix.ex:q ftXft.:.. ‘..'"tx

j .*. 9;;ft-- OfttaBB ..ftft?;*-;;-''" to

;• 9 1 ftU;; 9 ;,'•

i'ft' '. ' C V ft :. ftXt.W .ft. ft! a 000

., ^ X\vX .r^x-..x

OJft’

ft pftft-tOft;

I-'-

(

:

JTjl . r J .;ftft ftftft..fttt oift;- Ot X

• X

a.o' ft. ft- ft .ft J, V... OdB

Xi ' i aifts-ft.-ftos-qb xot iftCiJ '.ftfta ft T 9.:> x.r C'-'Bm \.oa.-.qDT;x

' '

', ‘,. .. ...pbXa CO

;X \ 0X :xtiftX.>cb ,:ftftXv/-':Xft?;ft-

:; ft-cxdft ,)Jo ft .- to J rob' -lo .,Ci r ?iif t-ft /'^xjX d ..Oft.,: x'^b-’-

r

.

•! vCi .U ,0 1 ' /B .0 ft.

;r- ./“>.j ,ft y c: .vftftft- o-ftvt ft. ft .aiftfti' .1-c-t cto :.; ..La 00 vft:3X

t:' 'J.,;

X>. V ... -. - ...

-X .. Sft Xj ' ,' ‘-..r .;, ftcLj

>- '/

ftf i.2-ftftOiftft •.,::.£ xr-oftic.ft'ftft'

ft' .

’ . ft- -vb Cft-.ftftfto lift: '.-0.0 .'ftj

V t J:

i, .0 •? r r- c. ,:h: s, ’-li;;' j r XA

I ft as'v.U; f i^-xc t Xo ai?OD .fLMj

S£:-. ].; .lIav; -aX

r'rft

'•iX :; x'-:- — -X : t:'xr.rej.a.i X:o nc,ra:a..LC'X.a-

• -•.i.Qc XX »: Xt i;Xxr y Mjirarol

J. ::X- :': .f

rti'asa TO V cd iinTraiV'^qR

OtiJ- to J'X^^x

'

imB'tt or!:'

• eoiXT viOl X Cfi X L, v,X :Txo.i' 'XS 'vTiXx-/?i:>t:IcrTX8 SiOfti.t; T-t

iv. X/i affo T- -

'^oarrcijl TOloX'^T "OX

X : tioxx jT;,.o ktoj

jft ftTft,'-.j£TO.XtiO-t efc-iv

' ^ _

^‘

• T ; ;1 S O'-' 0;;" .X X TT.ft: ft. ft

ft Xft ft ’'TOOX TOT '

fiGlrtc ‘rsCE3.biq Jbite iftBi XCITl ft;':i t

Lux:.. ta .'/oft'-X'-

,t> ij ftTft.'.;;..S:>04U "'ftCft-IV a 0 ftX.: fx *y ift q. £j'V

V/‘

• Xft'OB ,t ft 9 Oil ftiOft b-‘\ly " - v:

s " '. X ft t me :;I :f- ^ . !T ...V .X jiXiiS: .G.X ftftcb’xoq xi; tT.ft:-: ft;9,.:,L>L;0.:

1

• '•

•? ftr i: C„B.!:pX9'X '”^j^

ftiot ' •'£ Ciuft •X*V ’•Jx.Xcft.;-: ft

cf i-> - _ Kf' Idi: X?.-I-L ^ '"iX 0. at .t.X -'VZUV

,.ftc f dftft ftO'Cc ft gXJ •u.C V'

... .. ft Ibsj.IerqB .cib ot £9 jostcfxa sbv/ neirixoeqa sfid' ^Xascr srid' §jn±Tjfta

anojcd'osltsb iBoXoTeV ,B6TB Ioot lo d'l pa leq dl to bsol

.nsmj-oeqa eriX to “letiiso srfd- Xb b9T.o3B9£i 3T9V;
. 4 .

4. RESULTS

The fire endurance test was conducted on June 6, I960

and witnessed by members of the staff of the Fire Protection

Section, National Bureau of Standards, Mr* James R* Powers,

Headquarters, U* S. Air Force , and I4r. M. Herrman, Bufards

and Docks.

The exposed surface was ablaze immediately but the flames

died out in about 40 seconds. There were lazy flames on the

surface for about 20 sec, starting at 3 min. Approximately

3 ft2 of the 3/6 in. thick wallboard fell in the southeast

area at Id min, followed by about 8 ft^ in the southwest at

19 min. By 24 min, about 40 ft^ had follen in the south half

j

none in the north (single layer area). After each drop-out,

heavy flames covered the exposed base layer of the two layer

application. At 2b min there were flames from all the joints

between wallboard sheets in the north half, which continued

until the first of this v;allboard fell at 39-1/2 min. By

this time the center deflection of the specimen v#as about 7 in.

and was increasing rapidly. The specimen was judged to have

failed under load at 4o-lA- min. Flames came through the

joint between the west and center roof panels, which had

opened as a result of the load failure. A stream of water

was applied to extinguish the burning specimen and the test

was stopped.

The deflection and temperature data are summarized in

figure 2. At 8 min, when the first wallboard fell, the deflection was 1.04 in. or about 1/180 of the span. The maximum

temperature between the wallboard and deck was 214 ^ under

the double layer and 26l°F under the single layer application.

Figure Ir shows the distribution of thermocouples on the " unexposed surface and between the gypsum board and deck panels.

The following is a tabulation of the readings from the individual thermocouples at 40 min:

TC 1 2

no 82

Ohexposed Surface

3 it 5 6 7 a 9 10 11 12

176 79 79 79 96 88 124 82 82 82
4'

5;.' rr© a^iV; jtisii' .£ o-.i£s;jta0 e'lxl enT

nox;;:''yvQ':t . 1q Vis j-g Ci;o .to.:; ,axev; 0\ £«si3?j:--:T> ,';?M ,a^-xxi:xi£4jc; lo ,.n 3j;.j!^x4L. ,i:'.~££.^0:’ *:. ,‘X:C >::i@0-X0'a T.£A j lX>t T'Di^S?:

•$ 2lo-c<i ito

v!iu^.„r.i; ?:;:ij Y-^-x> jxslfteiaA*:^]: as.xlc;;:- 2 j..i fieaoqYr^ ritrlV oxlj £.0 3*191; •:. I9?ix .cbaO‘0££ -U- oiiC4ix ;.ii xTiiro bexi:'

^'.i 9 '-*-n;r 'tx 9 xqr;;\ <i:.l&. £ :;q ^xtj“X£JS:i j^cea -•A xj/oxTb 'lol 93b1b‘'2 to£3brsjQZ £iib ai h%s^bdS.XM- arX. eir 'xo -'(tX (

j.s x-a;>NjiJ'xBa 3riJ; fix -'’xl i!; X|J.oqb yp M'fioXlcbz »nxi;ii oX :;x bx-X;.

X.LSii duijoB 9Xj nx a^XIjsX bad O^r XxinXc ^Biia -iXs Y'.’ -'xxxfii ^X

.ZiJo^^4Q-7b rio.es xoriX^ ,(a9Tx X9'^I riX'ioxi 9i-c^ ox exxoa

'XP'%^1 Cwri erixi Xx; eaau XoiBOcute oriri texravoo asixalX '^vasri

erinit;'; • axiX lit:; xio^X 9£ 9Y oXoriri xbxi XX XA .n 0.t^BolIc.;Qi

XorinJiriroo dolrivv ^iXa /1 sXj Xi;x 3ri-.«^exii£,.. lm.odXXaw

-rxle; X\x~Q^ .Bi- XIol: bB?xjriI.Xi.vr axilri Xo rieexJ: 9riri Xi.xo'r

.X \ j£u:si a.oiv xxexiipeqa 9'riX "ix> nclrioe-IXeb iaXi*Gri orip 9 ;. 4 i:xi li^rip

'^'Ve..i. cd ae;, xiri...:'XOeqB o'x'ri ^rxJ'Eaeooux e.i::w X:.ii! sriX ri;ix:o‘iri j 2?5sffssXX ^.iixffi Xa riBoX x-ori/^w ri^JXii'i

jBii riox.^X . .bX-

'

iio^x Xs^anoo oibs oSow oriri neooriou dxL.tx>i,

Tod.oY, xo liBo'iria i * oxbj-XxX MoX ©fix rio -j’JXa©-! a ax i;ex9Y-- ac=x:r eriri fKta .fisxxio-'js ix.Xn‘.ir^ci' ©xiri •?>S'.XLqqB axx

.I..»quOvia asx.

^iX x'^sXx^;i::xfi 3 exs BoBb xocwrix "• skbx^X mxa xio/J'osXXoX sad

eiXeri v'XX- bBSrOriXXxv jso:j;l. ©xX xx©rAx {j';.te 3 XX. : byxs;

eiXr:i±3XJxe exX x3ria ocit ao Obi\X qaoria "to ...rii -i-Hj..! zr\ r

ri t'i.ri an;..^ Hoeri b/ia oxxaijJLrBa . ©rid

_ c'irda'XoqnoX

:’;oXrieolriri€ri> osb-X arid oal-ux.; ri'XuXfe; 5.:a, ig-y^^X oldbcsb .©ri.'-

.rviXaLi ebb £obl b^i^uxXBC'i a.eri'

•- V

I CC 0’[

riiz' ffeevdori jbxtf..' ©osri'ioa i.'^boq^oxq

10 rioxXjsXffOBCj X. si: sri;i v/oIIoX ofi"

:iili;’i Of* ria soXqiaoocvfiGri;: .us;x

Lea oqxartl

Q *' 4^ b 9

<Cv O'i ric,. OSL *0

eriri iK aaXriL'c-soDs^oiij Xo eJcxriGdX-rieXri ©rid Ev-oaaal

'BiicvO ::';o9b ri.i.a- riiacri C0ia'.fiCa

..:i

rib

0

Oril
- 5 -

Gyp sum-Deck Interface

13 14 15 16 17 18 19 20 21 22 23 24

467 214 226 783 — 712 8l6 1555 1067 1180 1332

The fire endurance of the specimen was limited to 40 min

by load failure, and flame penetration through a joint. The

furnace control was such that no correction was applicable to

this time.

Examination after test showed that the glue joint between the

paper honeycomb and the lower metal skin was broken in all the

panels. In many places the glue had adliered to the honeycomb, c

;

closing the cells over areas as great as 2 ft^. Except in

these areas, the perlite had fallen from the cells. The paper

was blackened over only a few small areas and was a medium

brown over the remainder. The lower metal surface of one R2

paael had fallen from place and those of the other t\^o panels

were loose from the wood frame along the long edges. The wood

frame members were charred lightly and were broken at or near

midspan in most instances. Even after cooling, most of the

base layer of 5/^ in. gypsum board in the south half and about

half the single layer in the north half were in place.

5. DISCUSSION

The comparison between the single layer and two layer

applications of gypsum board must be based almost entirely

on the temperature data obtained from the thermocouples

placed at the gypsum-deck interface. The temperatures at

those in the half with the singihe layer started to rise significantly about 15 min before any of those above the two

layer application, when one of the latter started to rise,

it was equal to the minimum of the former.

Although most of the finish layer of the two layer application fell from place, nearly all the base layer remained,

whereas a significant amount of the single layer application

fell.
ooii'i'x 7lD©fI ‘!i r f a c;-^

C

v/all =v-OI

X.; JS XX oX

XXxX -ao XXX

\ I dl c!I +il cl ^x

C'Xii T^xx 'vb'f^

'5*"

ah-i? -x+i oX beXxinXX axi/ no!T'XoGc.ts ©dX Xo e.oria'KJMe ^xxX oriX

c-iX , .•XxXot .o diiXO'XiiX aoXX45‘iX©jaGf| .s&iil'i bn^ ^axicLtiil bBOi xc.

::: a:;;w,.n-olXo!:^xxoD ; or: . XBiiX iXcuQ XonXcoo i

*es:-X j axJX

neewXexf Xftio^ sxX XailX Xbsx X€^cr'ts nolXxnXfiiyrJF

siiX XI3. iiX. ncxoxd s.3¥ aS:'i^ .CxXeru xei^/cl 0iiX brm bsiotyx&aod

<^iiX oX, Xexerirjxj DBiX Cij'Ig 9dii' ?ieoBXa ril .aX^xi^q

. iU' :d S:-. 2,G levo rXXqo MX gnxaoXo

dfiqLq oiiX .sIX-30 MX hio’xJ. nsXI&X bM -3.XiXx<^q MX eaMX

SJifJitm aiicv F^rcj £::;:'»’r.3 XliJi^i© yaX e ^Irto Ttf^vo bmMo^Id asi:

X>L nao Xc eoB't-xrjB X;:;.X;3ii. 'lowcx MX MX -Xf^vo nwoiX

c.Xp£Jiiq Qv/X ^£C;iJg MX lo caoM biGi:. oc/^Xq bBr! 19X5.^^

X'XG^ ailoX. 9XiX boow- 9£iX ftCXX GBO^'iX 9I9-

•XGGi; '10 nMoxX . o^isw fcG.; ’ViXXr'sxX Xa^ixBM g*£5^k -yzed^Gir^ g>V;G-iX

9iix ’lo Xac'us ^ ^axlo'ob xx-aM iJsM- »?.•§= ruvaxanx Xa-om uX ra-.-qeMfe't

j^foyG biX;:; iiiH.,Li XJgvob 9xi3' nX I-iggg b\c Xo 0EBO

.9y,GXq i:X X-uM ;iX*i:Qi:i >KX .rxi rl^^cXii bxX XX^n

i’iO Io;3i U s XCi

•icvcx okX' bifG ‘xe-'<C2'I. ey^lz' MX xiosqXsd iioax-iBqiHoo ndX

YX^'xXdTiG Xao3[I,G' X98Gd ea Xsxm XxBocf to 8r;oXdii5>i.X..Mr-.

x9i;q;.fOoaisxx/lX g-iIX L^xbXcTo bX.gX sXbXx’i^c'Sfeii BflX '-: Xa n «^-xuXB-x©qfra X MT .o;^xiX'XcXx:lX 9--X X:- bd aEi(.

”Sl3 o\:X*x oX b3u‘xBX3 8ii!i§M- 0£iX ;iXXv 'XiX-d Mx nX -ooiiX

oyX Mx svooG oX;^ Xa Moiecf ql XGodx vlXfi/

, ssXm' . o;i beXTaXa ioXXbJ; guX lo 9X0 noXX *no.i:XBOxIqqo

. T9i3*iol 0 iiX 'to reyHxriXr oxiX oX Xodp^^ <?--w dX

axIqqB ‘i 8

' 4oX d^j ©dX lo ,:o'^X MXnXl oM lo Xeoai XsiJOi.ijXi..

jboiiXSiO©'! •;[9 'v;bI oo:.,,' MX X.lb '^X'lb^a jOOoXq rscxi IX9X uoio

noXXooi; iqqc ^lo'v^'X eXsxiXa eciX %. jciidomz -'• .XXol
- 6 -

6. SUMi\HY

The results of the test indicated a fire endurance of

^0 min for the particular specimen- It is not practical to

attempt to predict how much^ if any, longer this might have

been had the entire exposed surface been covered with the

tv/o layer application of gypsum wallboard.
o

YHAMCa .a

'm 0%it -b - to a'tos'.oT: ©4T

ov ©4^ xot ftim 0^^

aTi^ii sj# Xqm^SiB

orl:t 441V Ml £ys4 xiosd

•. T^’i^iil owl

' .' :V;'ir-;|ii^: "

, ,,.^, '

,T " •••

’'

-'•

'

’ ' ' '

:•

''

. ;.' ^

.^ ^. .. •: .

' ••’' v:l -'4' :,'^^r'<';'^ .n. . :: .s^r.: ‘

.

’

:" '. "•

:

' •:

’

' • - 4

'• : '•'

. ',’'v.-. •/'.•''l.i,-;-' /:;.,! "•

.. .’iisr' -•'? V m ...

'

' '^ ' V

1 '"

'-V. •,.• ^-: .

- '-y^V ^r'-.

. y'

. ,y:

-

'

. ' ^- ':.

;

- y

’ ' -;'•,. /’ ’-"i/

' 'X:--:'"\'--

'

'

• -y. -'VV-yyy.

i'-ivrtfc AA. •3L2