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ACTIO N REQUESTED ASPHALT ROOFING MANUFACTURERS ASSOCIATION 6288 Montrose Road, Rockville, Maiyland 20852 (301) 231-9050 January 14, 1985 MEMO TO FROM: SUBJECT: RESIDENTIAL ROOFING COMMITTEE RICHARD D. SNYDER, EXECUTIVE VICE PRESIDENT DISCUSSION MATERIAL FOR JANUARY 28-29 MEETING I am sending you some material for review prior to our meeting in San Antonio January 28-29,-1985: Thanks to an exhaustive effort by Henry Koopmann, we have a most recent draft of Chapter 32 of the Uniform Building Code. We are getting close to a final document. The Task Force, which includes representation from both ARMA and NRCA, is meeting January 15, and they will report on their discussion at the BOR and Residential Roofing Committee' Meetings. Please review this latest draft for that dis cussion. The most recent revisions or additions can be found easily by looking for marginal notations or hand-printed additions to the text.I I am looking forward to seeing you in San Antonio Regards, RDS/bah Enclosure BIRD 012915 3201-3202 Chapter 32 ROOF CONSTRUCTION AND COVERING General Sec.3201. Roofs Shill be as specified in this code Mid as otherwise required by this chapter. Roof coverings shall be securely fastened to the supporting roof commtction and shall provide weather protection fortbe building at the roof. Skylights shall be constructed as required in Chapter 34. Penthouses shall be constructed as required in Chapter 36. Foruse ofplastics in roofs, see Chapter 52. Forsolarenergy collectors located above or upon a roof, see Section 1714. OaflnKlona Sec. 3202. follows: Rr purposes of this chapter certain terms are designated as DELE TG Revise -Asbestos rewr, ac seefrtw atos te)j . OftSE PLY u^eftratlngai- fflfa< tun WIH'Ug Fnf'tj mi bmwr-- p/a (alien it is a Separate p BASE SHEET is out layer of fait or combination sheet secured to the duck1 Part*f a shtyfecL owr-which may be applied additionalfeltt. a cap shaat. organic or inorganie fiber- "Oilt^up roOHng membrane. ahtnglct.sroooth coaling or minaral aggregate a gradate sd *>-*& tat# pfe In * biHit-vp raaffttj mtiwbrane. !t Revise s' BUILT-UP ROOT COVERING is two ormote layers ofroofing consisting of a base-chart pig , felts and cap sheet, mineral aggregate, smooth coating or similar surfacing material. CAP SHEET is roofing made of organic or inorganic, glass fibers, siturated and coated on both sides with a bituminous compound, surfaced with mineral granules, mica. talc, ilmenite. inorganic fibers or similar materials. CEMENTING is solidly mopped application of asphalt, cold liquid asphalt corapoand. coal tar pitch or other approved cememmg'material. COMBINATION SHEET is a glass fiber felt integrallv attached to baft paper CORROSION-RESISTANT is any nonferrous metal or any metal having an unbroken surfacing of nonferrous metal, or steel with not less than 10 percent chromium orwith not less than 0.20 percent copper. FELT is matted organic or 4norganie glass fibers, saturated *r eontnt with bituminous compound. -, reinstate "inorganic* delete *glass." AciNsmrJ revise -HsLT NONBITUMPIOUS-SATURATEP, is maned-asbcttos.fibera-whh binder-fee ttsa with-wood-shingle-and-wood shake assemblies-as-specifiod-irt. Section-3204-fehr fELrt MtiBI-WMINOOS SDTVUm see Section CfcASS FIBER-FELT is a glass fiber sheet coated on bath aides wiih - RSV.JflNgS- *Lt has been Suggested that change His COm herSome name hi -femBmof-Fst fW ,.'?r:aiT BIRD 012916 3202 HEAVY OOrV FELT is an organic (*<t .dejtgrwd *t a bravq dlAq nwtari*y*t f*r HI* *nd-alhwgW. Delete INTERLAYMENT is a layer of organic, felt or ncnbituminouf saturated --asbestos felt not less dun 18 inches wide, shingled between each coune of roof covering. peierey Per Ttfefllfyrs. INTERLOCKING ROOFING TILES ore individual units, typictllyofclay ot-caocrets, potsetting mirrhutg ribbodor mterioclting vortical tidejoints dut- mlrictlaurW movement and waterpenetration. Dasre METAL ROOTING a metal shingles or sheets for application on solid roof surfaces, and corrugated orotherwiseshaped metal sheets orsections for applica tion on solid roofsurfaces orroofframeworks. -NON-NAILABLE DECK-b any deck which is incapable of tcttitung-n *reins tate (change name) PREPARED ROOFING is any manufactured or processed roofing material. other than untroatod-woodthinglss and thafcas. at distinguished from built-upcoverings- aedt s asfbalfc bvjle*,minerl surfaced rail rooting, and (<fx retardant- treated tuaed Oh Ingles and shakes, .'RWFtNG PLY Is letRer sf ftlb in biKlfc-Of reefing membrane. ROOFING SQUARE is 100square feet ofroofing surface. ROOFING TILES are units, fqpiedtlq efatg if concrete uhfeh tempi* Wirt w.e.c. standard Me, 32-12.. SVAKE FELT l heavij d /4q Alt decijnrJl apeetpienttg aa intertaqsisnL. between sovran. eg weed shake*. SWINGLE OMDERLAYMENT is fin organic Mt deseed as uiuterldgmenfe fee- shingles, SPOT CEMENTING is discontinuous application of asphalt, cold liquid asphalt compound, coal tarpitch orother approved cementing material. UNDERLAYMENT is one or mote layers offelt .sheathing paper, aa> bituminous-saturated asbestos feh, or orter apprev4 over which fiawtuoofing isapplisd. a roofing sqsten, is applied- ___ VAPOR RETARDER is a laverefmaterial era laminate utedH appreeiabtqredeen tfie f(**( wafer vagnr tnfetfw reefmg st|tem. - WOOD SHAKES arc tapered or nontapered pieces ofapproved durable wood of random widths ranging from 4 inches to 14 inches and ofthe following four types: 1. Hand-split and resawn; tapered with one sawed andone split face: semi-split: tapered with partially sawn and split faces both sides. 15 indies. 18 inches or 24 inches in length. 2. Taper-split: tapered with both split faces. 24 inches in length. 3. Straight-split: nontapered with both split faces, either 18 inches or24 inches in length. . 4. Taper-sawn--sawn both sides--edges sawn or split. Lengths 24 inches and longer . WOOD SHINGLES are tapered pieces ofapproveddurable wood, sawed both sides, ofrandom widths ranging from 3 inches to 14 inches and in lengths of 16 inches. 18 inches or 24 inches. reinstate, (change name) REV. 35 P--530 BIRD 012917 2&VAS Delete 3203-3204 Fire Retordoncy Reaoirnwstjfe _ See. 3203-j Rof corarmy. stall b alMiifia^as F*'r UtUriml (fR), Special Porpore (sf), r OriiMt<|{o) w defined in 3204. firm rmbmntmncu llaerf c*wriM in mu jfrtubri niiUM hiAii coate stall km jtafcin m Table 32-A . ' Fife R*tbnUn(4( Di(|mJ Sec. 3204. (a) FliMtUrdul Roof Coverings. A fire-retardant roof covering shall be anyone ofthe following roofings: 1. Any Class A or B-buik-uproofing assembly. __ 2. Any mineral aggregate surfaced built-up roof for application to roofs having a slope not mote than 3 inches to 12 inches applied as specified in Section 3203 (d) I 3208(<)4- consisting ofnot less than the following: Roof Deck Solid surface a$ noacombustible materials or minimum of -tt-iathVsi-inch plywood or 1-inch nominal boards or other material approved by the building official. Imflntiai Roofing Plies Fourlayers ofType 15 perforated oiganie fiberfeb. or Three layers ofType IS oiganie or inorganic pUat fiberfelt, and Surfacing Material 400 pounds per roofing square of gravel, crashed rock, ceramic or approved similar surfacing material, or 300 pounds perroofing septate ofcrushed slag. (See U.B.C. Standard Mo. 32-5 for mineral roofing aggregate weighing less than 60 pounds per cubic foot.) HrAny-built-up tuof-for application to roofs having a slopa not less than <4 inch to 12 inches-applicdar specified in Section 32Q3(dHi consisting of not lass thin the following;- . -Roef-PasfcSolid surface on neneombmtible materials or rwisimumef inch plywood -or -1-inch nominal-boards -or othar-matatial approved-by-thabuilding official. - Base Sheet and Hies- TWolayermfiypo-lS organic-fiber fefe-or-One layer of 14-poand glass fiber fch-boseahccti-orcombination sheet. at' Altemmtiretyf delete entirety. One layer efType 45 asbestos fiber fall bate thtat. and Cap Sheet*' One-Itycrof 90 pound miniral surfaerd organic-fibre-frit, rsp thm (require*not less than-two layers oforganic fiber fait), or TWkycmof55-poundnwcnd-sutfaced-ofganic-fibtrfcltsplii than, or -Goe-tayerof80-pound mineral surfacedasbesws-fiber felt cap sheet, or-- One Isyerof72-peumtmineral surfaced glass fiber felt cap shcct.-of-....... REV. dftMas P-531 BIRD 012918 3204 PS*-ETE . .4, Any Claw Aov D preparedroofing? 3. Any Claas Cmineral surfaced asphalt shingle* laid so that there tic not less -thanlwothicknesses ttany pottU-andlhetotal weight par reefing square it' asotlossthan 333 pounds. 6. Asbestos-cement shingles or sheets. 7. Concrete slab roof. 8. Metal roofcovering. 9. Slate shingles. 10. Clay orconcrete rooftile. <...IKAay maf wanting ayjtctqf uf maul ilunghjorshalralmuit tClmis D- Delete (k) Ordinary Roof Covering. An ordinary roofcovering shall be any one of Ae following roofings: EXCEPTION: Unless otherwise required because of location a specified in ""N ftrts IV tad Vofthis code. GroopM. Division I roofcoverings shall consistofnot I leu dun one layer of 55-poond wnooth-scrfaced orguuc cap sheet, at built-up V roofing consisting of two layers of type 15 organic fiber felt amt one layer of f tutftcfeg material at specifiedin Section 3203 (03: 3*04(t>}3 > /J jl -t-, L/~ n* a TO law JC~n Any roofcovering listed in Section3503 (e). Any fcttilt ay roofingassembly not lets titan Class Cwafirigr Any mineral aggregate surface built-uproofforapplication toroofshaving a slope of not more than 3 inches in 12 inches applied as specified in Section 3303 (d)-l 3208M 4. consisting ofnot less than the following: v Base Sheet--d Roofing files ,faM . // Three layers ofType 15 perforated organic orjauagaaio fiber felt, and --* f'CinSTCtTCj GS Ori^tnall^ Surfacing Material printed. Defete DELETE 300 pounds per roofing square of gravel or other approved surfacing material, or 230 pounds per roofing square ofcrushed slag ia 50 peuadsefasphalt:' or- 60 pounds at pitch* Any prepared roofingnot less thin Class CuAifuig. Delete VeUte Wood shakes (treated or untreated). (c) Special Purpose Roofs. I. Wood shakes. Special purpose wood shake roofing shall conform to grading and application requirements of this chapter. In addition, the deck shall be constructed ofVk-incb plywood with cxteriorgluc or 1inch nominal T and C boards, overlaid with a layer of approved asbestos felt lapped 2 inches on the horizontal and verticaljoints. An 18-inch-wide stripofthe Don-bihrminous Sah/mteet same itWsm felt shall be shingled in between each cause of shakes in such manner that no felt is exposed to the weather below the shake buns. As an altemate.-atHjiodariayroanv <* layer of !6-inchType X gypsum board shill be placed under the solid or spaced sheathing. ^ . / -j , , ,' , ^ Wfamous saataTca. REV. iW 85 P--532 BIRD 012919 320C .......... 2. In Group H Occupancies over 15,000 square feet in single floorarea. For requirements' on smoke end beat venting in buildings with high-piled combustible stock, see the Fire Code. (b) Mixed Occupancies. Venting facilities shall be installed m buildings of mixed occupancy on the basis ofthe individual occupancy involved. (c) Types of Vents. Vents shall be fixed in ibe open position or shall open automatically in the event of fire and may consist of skylights, exterior wall windows orother openings leading directly to the exteriorofthe building. Vents shall be atornearthehighest devxtion oftheceiling and in nocase kmerdun the upperoocthirdofthesmokecunaitt. Where plainglassis used, provisionshall be made to protect die occupants from glass breakage. In no case shall vents be located closerthan 20 feet to an adjoining property tine. (d) Releasing Devices. Releasing devices for aitonuhcally opening vents shall be activated by temperature. The temperature-releasing device shall be operated normally at a maximum temperature of 165*E; special circumstances warranting higher releasing temperawres may be approved by the building offi cial. Nonconrodiblematerials shall be used for hinges, lafebes and related details to prevent sticking and consequent failure toopen. (e) Size and Spacing of Vents. 1. Effective venting area. The effective venting area is the minimum cress-sectional area through winch the ha gases mustpassenroutetoalmospbere. Tbeeffectiveventtngareashxllbenotlessthan 16 square feet with no dimension less than 2 feet. 2. Spacing. The maximum center-to-centcr spacing between vents within the building shall be: A. InGroup B Occupancies: 120 feet. B. In Group HOccupancies: 100 feet. 3. Venting ratios. The following ratios ofeffective area of vent openings to floor areas shall be: A. In Group B Occupancies: 1:100. B. In Group H Occupancies: 1:50. (0 Curtain Boards. 1. General.Cuminboards shall be providedtosubdivide a vented building in accordance with (he provisions ofthis subsectioa. 2. Construction. Curtainboards shall be sheet metal, asbestos board, lath and plaster, gypsum wallboard or other approved materials which provide equivalent performance. 3. Location and depth. Curtainboards shall extend down from the ceiling for a minimum depth of6 feet but need not extend closer than 8 feet to the floor. In Group H Occupancies, theminimum depth shall be 12 feet except that it need ox be closer than 8 feet to the Boon provided the curtain is not less than 6 feet in depth. i 4. Spacing. Thedistance between curtain boards shallnot exceed250feetand the curtained area shall be limited to 50,000 square feet. In Group H Occupan cies. the distance between curtain boards shall not exceed 100 feet and the curtained area shall be limited to 15.000 square feet. j i ! REV. SEP 84 P-534 [Y A t; V/ BIRD 012921 3307 Roof Drainage Sec.-327. (a) General. Roof systems net dtsigiwd lo sppen-ewwiwlMd -*mm shall be sloped *;<* t <4 Mi in 11* for drainage. See Section 2305 (0. /" (b) Roof Drains. Unless roofs are sloped to dram over roof edges or arc { designed to support accumulated water, roofdrains shall be instilled x each low \ point ofthe roof. I Roofdrains shill be adequate in size to convey the watertributary to tbe roof 1 drains. I (c) Overflow Drains and Scuppers. Where roof drains are required, o*erJ flow drains having tbesame size as tbe roofchains shall be installed withtbe inlet ' flow line located 2 inches above the low point of the roof, or overflow scuppers having three times tbc size ofthe roofdrains may be installed in adjacent parapet walls with the inlet flow line located 2 indies above the low point oftbe adjacent roofand having a minimum opening height of4 inches. Overflow drains shall be connected to drain lines independent from the roof drains. (d) Concealed piping. Roof drams and overflow drains, when conceded within the construction ofthe building, shall be installed in accordance with the Plumbing Code. . (e) Over Public Property. Roofdrainage water from a building shall wx be permitted toflow over public property. delete Refer to IS isasff), 4sosff) $ Pfumbinj Code Sections Rev. Jn s P--535 BIRD 012922 woo Ro*f covering matoWtli and plfettiWk See. 3208. () General. Roofcoverings shall be as specified in this section, and shall be provided at follows- 1.Materials. Thequality and design ofroofing materials and their fastenings shall conform tothe applicable standards listed in Cbafttr 60. 2. Identification. All material shall be delivered in packages bearing the manufacturer's label or identifying mark. . Each package of prepared roofing and buih-up roof cnvcrin|^m*teriils shall bear the label of as approved agency having a service for the inspection of material andfinished products during manufacture. Each bundle of wood shingles, slate shingles and wood shakes shall comply with U.B.C. Standards Nos. 32-8,32-10and 32-H. respectively, and shall bear the label or identification marie of an approved inspection bureai or agency showingdie grade. Asphalt or pitch shall be delivered in cartons indicating the name of the manufacturer and die softening point of the product. Bulk shipments shall be accompanied bya certification of the softening point by the manufacturer (b) Application. 1. Generali Application ofroof-covering materials listed in TaMcNo- 32 B shall be in accordance with the fgowinj provisions thareef.r Asbestos-cement roofing. Corrugated asbestos-cement roofing shall be applied in anapproved manner: . Asbestos-cement Shingles. Asbestos-cement shingles shall comply with U.B.C. Standard No. 32-9 and shall be installed in an approved manner: Aabattw irnmm ihiagtw any bo totalled wt tlapas at lew m J indies in 12 tohM etoie * naHinn rmwifit nf tiun i< -.1--rp. ft], pfliad lliiagls Tm1u>i>i 3. Asphalt shingles. Asphalt shingles shall comply with U.B.C. Standard No. 32-3. Asphalt shingles shall be fastened according to manufacturer's instruc tions to tclidly-theathad roofs, buHiot tan than four naik par-each wrip-shiiiglo not mort dun nominal 3A mchet-wide and two nlcpereacbindividMl-thingleact more than 18 inchat-wide shall bo usad. ui as stt forth in 1eM* Ne.&-B. Underlayment may be emitted over earningasphalt shingle roofseacept when ythPavawVrrOlrWvvVaWkirJlv#OUviwhmlBvivwiotovlinaevotwitn1v^nrwvrftiKvaoevr 4. Bnttt-up roofs. Built-up roofing shall be applied a* f>>n^ovnl. eleaw and dry decks in accordance withthe manufacturer's instructions and thiseode.-Wbod nailersshall be-inwalled aHha-perimeter of all rum-nailable decks and anho-top of all curb*. Adequate attachment shall be provided on all vertical surfaces. Reglcta shelfbe sbaH-bavfrwood insulation slopsora!1 edgesofthedecfc.Siu'uble cam strips shall bausod-at all verticalintarsactionsr table No-51-C The base sheet shall-be eemented-orspot-mopped Union-nailable dacks as required by the type ofdeck material, using not lost than 20pounds per square of asphalt for solid mopping (10 pounds per square-for-spoi moppmgVor not tost. dwn4 tfrgalkmtofcoMbituminouscompound in accordancewith manufacturer?t. publithedcpecificationtr^r 30 pounds-per-square ofcoal Ur pitch. Qiw ippwwnt aailaWe inclti. .lK nV.U.4 tfT .fry.. RW.JftKBS P--53# delete BIRD 012923 32M Soocescive toyers shall be cemented using wo teas eemewting material than dm speeded faro solidly ttmemtd here ehoet. Mineral aggregate sorfeeedraofsshaH besurfaced with not-less than Wptwofo of-asphahcfrWponndsofpitch in which is embedded net lew thn400peui>rfsf gravel-or other-approved surfaoag-materialt oe-300-powtdc-of-oushed-slag per -roofiagsquare. See Section 3303 (0 % for minimain amoonis af miaetai-aggre gwe-ind asphalt or pitsh-oa-ordiairy rooft. (Sea U.B.C. Standard No,-3M far. wuxadnoTtaf iggrcgstemighutglcss Ami <0 pounds par-cubic focs.)- tntfrtial than that.specified for solirily ccmenxcd.bisc.shorts ^ephtfrfemstashascemcot andmoppingcoat foehuilt-iip roofcovering shell complywjth-U.B.C. Standard No. 33 3. Asphalt shall ha appliad as a-tamperaturoam lost shin 27CT-aor mote-than ofless dwa-mfK wmwmlwWfF. Asphalt shaH-iwsU heitedto i tiiBpoiaswabovf-S00*K for-a-high molt typo nord00*F. for low-tack type*. Coil Uf-pitch shall not be heated to temperaturebo> 400*R.Ai oa time shaH-the asphaft-ba-heatad to a temperature whieh wjll4wJ tta-fUshpcat as the knit. BttHt-op roofing-shtH he applied by starting at<ft> low spots and working. wmob-FiIu end rep thaetuhiH be appliad io solid UMfomarooppings ofbitisroen. feileaera shall be amt forth banin-or in TableNo,-33-B and shall-be-long anough to penetrate-Imo-tha sheathing V. -inch-or through-the thWasssof-the theithing,-whichever is Itii. Buifcsip mnfing atilt fnmtwrf Want rti-.il Sw. 1? p,,.p. SA-m-s. hetdrdriven thretigJuincept-or-approved noils with integral ceps. Fw plywood. oat-Noi >1 giBgoakigshrtak nails driven -throughtiit caps-or-approvednaiU- with integral caps. Rar gypwnMlccks^tnsulating concrete. cementitious wood fiber S. Clay or concrete tile. Tile of clay or concrete shall comply with U.B.C. Standard No. 32-12 andshall be installed in accordance with Table No. 32-D andfaeteaedwith corrosion resistant nails or winei 6SLETE Ncmmtertocfciag tiles with pinjecting anchor lags at the bottom efthe tiles shall DELETE riwuhiag over tha uaderlsymcnt. htterioskiwg-riles with projecting eaehoe Inga may beinttalied-over spaaed sheathiagboaidi linehbyliach woed stripping neiledto solidwofsrimhingcivditeetly-to-solid roof-sheethiagr provided' in all cates each tile jr-atBchotfriw-- sonfonnanee with Table No. 23 Tile roofs shall have eo yndctlaymeei ef net less thaw two layersefT^pe 15 ftH or one byar-ofTVpe W felt. Intertocking roof lilet-miy be intuited <m ekycsbclow 3 iachcs-in-tt writes- fashiea end selid mapped taggitw; with approved csmroiiwg tnaurist between the plies. Wine jnnrieskiegtilts ere used. the tiadrrtaytnrnt may mrthrof-mw teyerof Type <0er heaviet itphsh coifed hue theei errtaadiiig frenvthe *tn* w paint 34 inchei iai<lMhe-enoor aU-lioe of lhc tgilling.JW)ea-thts.inHliod is all harisaowl-ind-wnirsl uvns of4he base then thill be tapped *iaditssndbt ^owinuoutly- tesled-ieHttepproved-ccwetHifU mUertel end shell he syylied eoly REV.JAN 85 P--537 i BIRD 012924 33* 6 Mul roofing. Meal roofing exposed so the weather shall be corrosion icsisam. Metal roofing shall be applied in an approved manner. Hat sheets shall be applied only to solidly sheathed roofs. . Corrugatedor ribbed steel shall be not less than No. 30galvanized sheet gauge. Hat steel sheets shall be om less than No. 30 galvanized sheet gauge. Other ferrous sections or shapes shall be not less than No. 26 galvanized sheet gauge. Fla notifenous sheets shall be not less than No. 28B.*S. gauge. Other aoofenotu sections orshapes shall be not less than No. 25 B. * S. gauge. Cotrogatedor caherwise shaped sheets or sections shall bedesignedto support the refused live load between supporting members. Ferrous sheets or sections shall comply with U.B.C. Standards Nos. 27-9 and 32-4. Nonferraus sheets or sections shall comply with U.B.C. Standard No. 7- Metal shingles. Metal shingles shall be applied in an approved manner. Nonfcmms shinglesshall be not less than No. 28 B.&S. gntge. 8. Sheet roofing. Sheet roofing shall comply with the provisions of U.B.C. Standard No. 32*3 and shall be Installed in am approval manner. 9 -Slat* shingks.'Slaie shingles shall comply with U.B.C. Standard No. 321Dand shall be installed inan appMiWitmjnnrr 10. Wood shake*, shakes shall caapf., U.6.C. Standardf*. M-a*d ahatl ba installed m accord*Me with Table No.S2*B. Shakes nay be applied-to-roofs-with solid er-spaaed sheethingiln wind-driven-snowareas sheathing thaBb*solid rodtheshafcasshalh be appliedoveranandeflayinent ofnot-less than Type 13 felt.. -ShakesshaHbelaid with asidelap ofno letsthan U6incheshttvoenjoiats ia -adjacent courses. than 34 inch. -Shakes shall-be : -approximately-1- inch from-each edge and approximatcly-2-inches-above-theexposure lint. Tha startercourt* al theoaves shall-be^oubled.-Th* bottomcr-first layer' maybe-eithesshakes or ihinglet.' -Shakesshaftbelaktwith not lessthan Ift-mch^vidc-ttripsof-not lr thsnJWpc yyfehshingledbetween eacbccursetn such amannerthetwofeh-isexposedsorhc waathesbclow the shakebutts. ridge weather exposures shall not exceed those pemtittad for tha field ofthe roof. Wend shrlusmayteinstalled on aslope tut Icg4ha-3inchw ie 13 iedwt whraintwllrdoweranundcri^inentofiiotlenthan'iype ISfrltaodwliteapgmvta li. Wood shingles. SKmjIrs aWall eompli) witW t/< b.C. Standard sit. 33*1!and sbalt be Installed in aaerdaiiee oitt Tabtr N*. Jl*6, Shingles msy be applied ta reefs with solidofspeaedohoathingrShinglesshaltbc laid withsside lapofnotlessthan4<4inches betweenjoints in adjacent-courses.-and-not-in-duett alignment in alienate eoutseu Spacing between shinglcsshall be not lessthan `A inch norinoiethanWnshrSachshingle edgoandapproxiraately-t inch above the exposure line.-Startercourses! theeaves, shall be doubled. Weatherexposures shall not excerdthos* set farth in Table No.33-ArHip and. ridge weather exposures, shall act exceed those permittedforth* field ofthe roofc- RE'l OCT 84 P-- 538 y BIRD 012925 SEVR CUHPt-re in tact needs e. reference definition 3308 Mi rib. Question 2a g*. NRCft Kdrvual tells fir 24 j. Avt to 4<P!iC+'> problem* ;* Shirnr mU |. (c) Flashing. I.VaMCgt: Roof valley flashings shall be provided-for- shingles M-foilewarlog Shown Mom. Shingle epolicob'en shed he CansHtenj mid, eomticeUe Title32-Btr37- A. Asphait shingles. The roofvalley dishing shall be (he same as requiireeddffoopr) wood shingles orshall be oflaced woven asphalt shinglesapplied in an approved maimer with an undetiayment of not leu than one laprolthi *r T>1* M feh extending 18 inches from the center line each \ V ternpiefritf revise^ *ay. oa-ahalt beof two layers of 90-pcundnumral mifaeed eap thcet cemented together.with the bottom layer not lets-than 13 indie* wide laid fate down and the top layernot Wes-than 24 mrher wida-laidface apt- nr per uunvfectvrerk Mstrvetians. ________ - B. Metal shingles. The roofvalley flashing shall he providedofnot less than No. 28 galvanized sheet gauge corrosion-resistant metal applied over an under- layinan ofixx less than ent layer of vn4<rhb("viit r Type 15 felt. The metal shall extend at least 8 inches from the center line each way and shall have a splash diverter rib not less than V* inch high at the flow Hoeformed Wise l/nderlatjwert as partofthe flashing. Sections of flashing shall have an end lapofnot less than 4 inches. SEE FO LLO tO lM d C. Asbestos-cement shingles, slate shingles, and dap and concrete tile. Theroofvalley flashing shall be provided ofnotlessthan No. 28galvanized sheet gauge conosimwesistant metal applied over an underlayment of not less than *ise tOtfOT t ahlajte vaterl<i|<nntr*r Type 15 felt. The metal shall extend at least 11 inches from die center line each way and shall have a splash diverter rib not less than I inch high at the flow line fannedaspartofthe flashing. Sections offlashing shall havean end lapofnotless than 4 inches. TCYfse underfm^aenfc D. Wood shingles and wood shakes. The roof valley flashing shall be pro. vided of not less than No. 28 galvanized sheet gauge coiroskm-resisuuit metal applied over an underlaymentofnot less than * InrC thinjlt Type 15 felt. The metal shall extend at least 8 inches from the center line each wav for wood shingles and 11 inches from the center line each way for wood shakes)Sections offlashing shall have an overlap ofnot less than 4 inches. a.Otfter ftashtno. At the juncture of the roof and vertical surface's, flashing andcounterflashing shall be provided m required in Section 1707 tbV revise otvleHatjtncxt * f*r reofing manufacturer's inVrcVionx, and when( metal that! he net less tKanOAgavj* cerree.m, resistant metal. bhfteef anseUtion. Theuse ofcombostible roofinsulattoo (MU may be per mitted, provided h is covered with approved bout-up roof covering applied' directly thereto S Set forth in Table No. 3i- B. For other -fypr of rooF caverina.tke inwUKm eball be covered with * suitable nailing base. Pw foam plastic, see Section 1712. Insulation shall be ofa rigid type suitable forapplication ofa roofcovering. Where fire-retardant reef coverings aw required.-iiauletions shall bt-a type apptovcdfbrthctypecfdeck and the built-up roofing applied. -Where fcuih-up-nsefing-is-to-be-epplied. vapor-barriers shall be'installed between-the-deckand-rhe insulation where the-averageJanuary-temperature isMow-4$'F. or where excessive nvaisturo-conditionsw-amkipated within the bn M?nn. Co tvs ptehltf revise RPf.jfifias fc-539 hsAah'en shell be of a fupe Assignedfor use miff a. road Covering. The use of combvsh'il*- root iosvtptien map b* permitted, provided it is covered iuitb eppreveti roodsevering nppfied directftp therob et set firff in fatb tb.32-E. for other types efroofcovering, the. insviccfion shell 6e covered it oceordenco mitA reefcovering menufechrrers reecnnmondefien. For foam plesh'cij set Stefirt 1712, BIRD 012926 A. Asphalt Shingles The roof valley flashing shall be provided of not less than No. 28 galvanized sheet gauge corrosion-resistant metal, which shall extend at least 8 inches from the center line. Sections of flashing shall have an end lap of not less than 4 inches. Alternatively,, the valley shall consist of woven asphalt shingles in accordance with manufacturer's printed instructions. In each case, the roof valley flashing shall have a 36 inch wide underlayment directly under it consisting of one layer of shingle underlayment or Type 15 felt running the full length of the valley, in addition to the underlayment specified in Table No. 32-B. In severe climates, the metal -valley flashing underlayment shall be solid cemented to the roofing underlayment for roof slopes under 7 inches in 12 inches. B. Metal Shingles The roof valley flashing shall be provided of not less than No. 28 galvanized sheet gauge corrosion-resistant metal, which shall extend at least 8 inches from the center line each way and shall have a splash diverter rib not less than 3/4 inch high at the flow line formed as a part of the flashing. Sections of flashing shall have an end lap of not less than 4 inches. The metal valley flashing shall have a 36 inch wide under layment directly under it consisting of one layer of shingle underlayment or Type 15 felt running the full length of the valley, in addition to underlayment required for metal shingles. --* In severe climates, the metal valley flashing underlayment shall be solid cemented to the roofing underlayment for roof slopes under 7 inches in 12 inches. 4AM 85 w- p- 555 A BIRD 012927 320* (e) Flashing. t.VaUflqs. Roofvalley flajhings shall be provided for shingta ai follows: C. AsbcstM-ccmcat shingles, slats Atafitt, and day and concrete Me. The roofvall^flashingshallbe providedofnotic than No. 28galvanizedsheet gauge ccrrosiotwesistanl metal,pplied s*r aa uodariiyimiit of aw tm --` **-[-- -e ntol>|iniitir Tft*-HF frit. which The metal shall extend at least 11 inefaea from tbe center tine each way and shall hive s splash diverterrib not leu thas 1 inch high at the flow line formedas paitoftheflashing. Scctionsofflashing shall haveanendUpofnotlesa than 4 inches. aPer roof slopes af 3 Inches in H inch** nl ever, Me mW vailof (UthiM shot hw * ind) wtitt Iiddltlnpucnfr d'Vrctfu under it tnoittiM*( u* {<tyr *t sM<yf* wl*(Wfrr fype Isfaffc "**f*J, ifteCaii lecgK ePth* velty, M +{,. u4*rre^w.fc inTWlc Ne.M-0. n severe climate*, -rt,* mcfnl veltey ew5 0M(rt*feit shot! to *,:d to * reof-in} uMterU^auaC {(, *. stapes under *7 irtUf in tl inches. RSV. dtHS P--539 B BIRD 012928 D* Wood Siting les and Wood Shakes The roof valley flashing shall be provided of not less than No. 28 galvanized sheet gauge corrosion-resistant metal, which shall extend at least 8 inches from the center line each way for wood shingles and 11 inches from the center line each way for wood shakes. The metal valley flashing for wood shingles shall have a splash diverter rib not. less than 3/4 inch high at the flow line formed as part of the flashing. For wood shakes the diverter rib shall be not less than 1 inch high. - The metal valley flashing shall have a 36 inch wide underlayment directly under it consisting of one layer of shingle underlayment or Type 15 felt running the full length of the valley, in addition to underlayment specified in Table No. --^ 32-B. In severe climates, the metal valley flashing under layment shall be solid cemented to the roofing underlayment for roof slopes under 7 inches in 12 inches. JAN 85 Tj*y P- S39C BIRD 012929 OCCVFANCV r.tt . 11 0u TABLE NO. 32-A ROW COVERING ftGCJUlREMtMT I out-noun 1 vrp*% o^coMtmueTioM 1 *1 m |one-houh | m II || ... * II h.t. lONtmwn I l1 1 1l l 1 n Art At 2-2.t A-a A-4 B) 1-2 B)S*A E H-l HJ2-J-* FI M F3 M R-l R-3 fr 1 n FR ... I FR FR n FR FR 1 FR FR 8 FR FR 8 FR FR 8 FR FR H FR FR 8 FR FR FR FR FR FR FR FR H FR FR 1 FR FR 1 FR 1 FR FR FR FR FR FR FR FR FR FR FR* FR FR FR Not Permitted 1 cflgana FR tMIhnittaa FR 1 fr lUStmlltri FR SP*.FR St.FR SPFR | 5P.FR S-ttFR fr FR FR FR 1 FR . FR fr SPFft spfr 5PFR 8 5P*FR SPFR fit FR FR FR FR PR FR FR FR FR FR FR FR FR FR FR FR' FR FR Nor Permitted FR FR FR Not Permitted FR FR FR FR fr Not Permitted Not Permitted [CE5523 FR FR Not Permitted FR | FR Not Permitted FR* (URrmifri E32S33 L_w___xJLHliffJi 64 <5*~pFTo^- o* FR 0*,$P*FR oT.spfr Bo*.siPfZlcftsPFa Cf.SP?FR FR O 0 o o O N--No requirements for fur resistance F.R.--File resistive H.T.--Heavy Timber ! See Section 1002 (bi FR " Fire Mordant Roof Covering SP " Special Purpose RoaCCovering O -- Ordinary Roof Covtrimj 2. Ordinary root coverings may be used on buildings otCreup-B. Division V Oeeupaneiat which are sot more than twostories inheight andhave not more than 3000square feel ofprojected roofarea and there is a minimum of 10 feet from the extremity of the roofto the property line on all sides except for street fronts. ,, 3.Croup-Ai Division 3; Group Bt Divisions I and -2 and Group R. Division 1 buiWinqs Qeeupaaeiir.which are not more than twostories in heightand havenot morethan 3 6000 Square feet ofprojected roof area and there is a minimum of 10feet from the extremity of the roof to the property line or assumed property line on all sides except for street fronts may have Class C roof coverings which comply with U.B.C. Standard No. 32-7 and roofs of No. 1 cedarorredwood shakes and No. I shingles constructed in accordance with Section 3204(e). Special Purpose Roofs. 4. Copy DfCEpTteM from page P-532 REV. JAN 85 BIRD 012930 Wood Shingles and Wood Shakes The roof vaTley flashing shall be provided of not less than No. 28 galvanized sheet gauge corrosion-resistant metal, which shall extend at least 8 inches from the center line each way for Wood shingles and IT' inches from the center line each way ftpr wood shakes, /the metal valley flashing for wood shingles shall have a splash diverter rib not less than 3/4 indhhigh at the /flow line formed as part of the flashing. For wood shakes the diverter rib shall be not less than 1 inch high. j The metal valley flashing shall have a 36 inch wide underlayment directly under it consisting of one layer of shingle underlayment or Type\15 felt running the full length of the valley, in addition to underlayment specified in Table No. 32-B. In severe climates^ the metal valley flashing underlayment shall be solid\cemented to the roofing underlayment for roof slopes under 7\anches in 12 inches. JQN 85 \ S- 539C BIRD 012931 occufMcr A-l A) 2-2.1 A-3 A-* B) 1-2 B)s-+ E K-J K) 2-3-41-1 M t-J M R-l R-3 TABLE NO. 32-f\ ROOF COVERING REQUIREMENT Tffra of coNsmencm ?11!1 ____ MII__511S ML . || i | OMC*HOUH | ii N GKffiL-l'IJI ____H1L*L___ 1 i-fflgsaoi I ii ii i "1 . Minimum FtRE <hN*tPt>i'Mt>r RSTARPAnCY Fit FR 1 Not Permitted 1 fr FR *R N.tfc.W<( FR Kit ftmitteA FR 1 FR Mftmtftnl PR FR FR FR SP>.FR " SF!FR 5P.FR | SP*.FR 5PFR. FR FR FR FR FR PR FR 1 FR . FR FR FR FR FR SP*,FR SP*.Fft 5PFR B SPFR SF* FR FR FR FR fit FR FR FA FR fa. FR FR *R FR FR FR FR FR fr FR FR FR FR FR FR FR FR PR FR FR FR FR FR FR FR FR FR FR FR FR Not Permitted fr Not Permitted FR FR Not Permitted FR FR FR FR FR it FR FR Not Permitted FR Not Pennitted FR | FR Not Permitted FR* CEEHZI FR* oiuStnUi i&i, aSJU l.-fff..... FR FR 64 I &* H 04- II o* 1 0*1 FR 1 R FR | FR FR FR 1 1 0 1 1 1 N--No requirement! for fire resistance F.R.--Fire resistive H.T.--Kerry Timber I. Sec Sectioa 1002(b) Fft - Fire Retardant Roof Coverinj 5P - Special Purpose Roof Covering O -- OnUnanf Reop Coverinj ^ 2. Ordinary roof coverings may be used on buildings of Group R. Division L Qeeupanciiswhich are not more than two stories inheightandhave not more than 3000 square feet ofprojected roofarea and there is a minimum of 10 feet from the extremity ofthe roof to the property line on all sides except for street fronts. ,, 3.'Group At Division 3; Group B.-Divfcioiis l awd-2nd GroupR. Division 1 buildinqs -Occupancies-which uenot more than twostories inheight and havenot more than ^ C000 square feetofprojectedroof area and thereisaminimumonO feet from the extremity of the roof to the property line or assumed property line on all sides eept for street fronts may have Class C roof coverings which comply with U.B.C. Standard No. 32-7 and roofs ofNo. I cedaror redwood shakes and No. 1 shingles constructed in accordance with Section 320*(*L Special Purpose Roofs. 4. Cepf DfCEPncM (rtm page P-532 RCV. JAN 85 BIRD 012932 III Roof SLOpe 2':iaw to 4':ia" Aspbalt tfciaglta NOT f>SP.MiTTKt> bCLov* | Vm* & o-r Deck reguirkment aot-merr thin nomiaal it inch** wide sod two Mil* paraarh individual thingla aamwwthaa U imho* wide shall he used. UNDERLAVM6NT Temperate- climate 5h^iflgj)w!J tow is 2 inches in 12 inches, provided the shingles ire approved self-iesltn* orarehu^ieakdandjreiastiltedwitiwiugeriiyfneatcoasmiafoftwo hycreofahlngl# u4*rl*Int5^l>TeTjK* *?ljelihjfte&shioa. Startiaj wMiao Ifwide *lataa4a4C*wrila *Mct Mtn'tat f*i M>Kyt sbest stall he tayfed i**hfiwta*^. - * 3tSl4(t> a*4 X5i7ffc)*T Da layer fhSajlo underlay*an* * V. Mrltentwllif and 4" varKMliy tarim Severe climate: loorea* u*jet fowMN drtotn soul r >(* bviftiup- Sew** a* fW toaperate *liiMi*,Miiiilltia*lly tfiajtwo layeis i ! mopped Mwwitait together with approved cementing material 1 between the plies extruding from the e*ve op thereofto apeiftt Hat 24 inches inside theexterior will line ofthe building. law* aa toceatad rfiowotbtfmejp>arrceoteatceldlmflaostesiWbn*; applied f>on tht eaves to a lint K-1 anterior wad lino uriih all lope a Attachment Tup* if fasteners 'Kj) N*.ef fastener** Euposvre FleM of roof Hips iriij.cc Hefted ftmiEm-rctliiwliMai, miaiavM itGavpe^ftiA M,*r Cf**Miaw reatetwafc *tflra>ai<nl-r-.(tCV3*>WAt Inch araunw.'dtii. Fasteners shall comply with the requirementsof U.B.C. Standard No. 25-17 Fasteners shall be long, enough to penetrate into the sheathing V* inch or through die thickness ofthe she* . 4per 36-40 inch strip - 2 per 9-18 inch shingle Per maanfacfcirtt-i lachueKms i*cttaE wWh pacSajca f atrinjtea. Hip and ridge weather exposures shall notexceed those permitted for the field ofthere* per aiiigAi(lmri hihvth'ai Mv4n( il4 fachajcf ( iktajlo- FLASHING Valley s f^*er flushing Per Section 32o8fe)IA Per Sects o*% 3ioBfe)z ') ------- iafwh*o arc fr nornal fffUtflim - f*r Spatial emdlilfis ***** M pfl;c*H*n *( w^irt fCt r* n wloV rrjfm*, thiajlff shall be fr naiwfariwr#*-V fathvttfene. REV. URN 85 Per SecKon 3208 (t Per Section 32o8fc BIRD 012933 . TABLE 32 -B SWtKGLE APPUCRTIOM Wood shingle* | Wood shakes NOT PSRMV TTEO &E LOOJ s': 12* sow TabU Mo. 31-C. sh Table Mo. 32.-C Shingles may be applied to mob with solid or spaced sheathing. Shakes may be applied to roofs with solid or spaced sheathing. , . f*it Urrt* t* r* Spaced sheathing for wood roofs ihall be spaced oot to exceed 6 inches dear . oormorethan the nominal widthofthe theathiflgboard. Sheathing boards shall be not less than i inch by 4 inches nontinaj dimensions. Sh9td>in)th(let*HraiH No re^viremenfs 1* tSrtOOt Or* Shtkt* shall ba laid with noi loss than 18-inch-wide j course in such amannerthatnofeltisexposed to theweather below the shakebutts. Ht iMUk* M (M&b H- M bjriUr. __ ____ d.---1 - :Too byen of Shlnjlo uAderhhfnwtb ar lypej) felt applied shingle fashion shall beinstalled and solid moppsd cemented together with ^proved cementing material between die plies {extending from the eave up the rooftoapeiaS 36 inches inside the exterior wall line ofthe buildtsg. tine Sheathingshallbesolid andtheshakesshall bcaffiticdovmm^ Two layers of vdrlii)nw{|i^!e1jjatapplied shingle fashion shall be iastallcd and solid mopped etmen+rd togetherwith approved cementing material between the plies . extending from the eave up the roofto a point 36 inches inside the exterior wall line ofthe building. whichever is less. <ffww<l hftkt WUfj iflfiWal. (mosiMw.rvSKfimtlMiU, *>iimym06*J>i*,f/ssimA, heJl.tr e>miim.nf!thet{afln;rfaffnv(4l3<b biUltjdftiiil. Fasteners shall complywith the equireroentsofU.B.C. SundaidNo. 25-17 Fastcnfcrs shall be long enough to penetrate into the sheathing V inch or through the thickness of the sheathing, whichever is less. 2pcr shingle s' 2 per shake Weatherexposures shall not exceed those set forth in Table No. 32- C Hipand ridge weatherexposures shall not exceed those permitted forthe field ofthe roof. j j Shingles shall be laid with asidelapofnot less than inchesbetween Shakes shall be laid with a side lap ofnot less than 114 inches ' j joints in adjacent courses, and not in direct alignment in alternate betweenjoints in adjacent courses. Spacing between shakes shall be | Shakes shall be fastened to die sheathing with two nails only, j fastened with two nails only, positioned approximately % inch from positioned approximately 1 inch from each edge and ] H cadi edge and approximately 1 inch abovetheexposureline. Starter approximately 2 inches above the exposure tine. The starter course j course at the eaves shall be doubled. at the eaves shall bedoubled. The bottomoc first layer may be either 1 Shakes orShingles. jstarterctvrseatthetom **4. Fifteen-inch or 18-inch shakes may be used for theAfinal course at the ridge. ! 1 1 "1i 1 Per Sec4fn 3206(0)111 Per Section 32.08(e) \^ Pgr See-Ken 32o8(e>2 ter Section 32.08(e) 2 ' -Ms) BIRD 012934 . /%! f s TABUS NO. 32-O-MAMMUM WEATHER EXPOSURE 1 rIDUESSTHAN 1 cmr ffOOOSHMGUS ranr AMOtTtem No. 1 16-inch No. 2* lb-inch No. 3* lb-inch No. 118-iocfc No. 2* IS-inch No. 3* 11-inch No. 124-inch No. 2* 24-inch No. 3124-inch IS-inch 24-inch 31'.* 3Vi* 3' 414* 4* 3i* 5y.* 3V4* 5* TOGOSHAKES1 7Vt* HP 5' 4* 314* 314* 414* 4* 714* 614* 3V5T 714* !(T 'lobe feed only when jpccificallypennittcdbythebuiMinf official. JEapoue ofthe 24-inch by Vinchmiwn bandsplit tapered shake type thill not exceed 7i4 inches on roc/slopes less than R inches in l2incbestoaminiraumof4 inches in 12 inches. *Wood shakes may be installed on i slope not lest thin 3 inches in 12 inches when installedoveran underlayment ofnot less than Type ISfelt and whenapproved by the buildinp official. $j Rev, SEP 84 BIRD 012935 1 r .1 c fre 41 's' If Wi :?** JL I* <w r it " Ja fI xl Jl J* 3* V ^ w* Kvl --Wsl 2* j<i5 Se _r C * is *6 e =e >BC s e cc BIRD 012936 k .J BIRD 012937 TABLE 3 2 - E B U IL T -U P ROOF COVERING A P P LIC A TIO N f BIRD 012938 REV, JAM 65 TABLE 32 P ^ Built-up roofing Use of mechanical fasterns for attaching roofing p**'es, \ related to.siope of roof \ \ Nailable decks \1 \ Non-nallable decks 1 \\ A Insulation over nailable or non-nailable decks \ Surfacing Slope Requirement GRAVEL SMOOTH CAP SHEET \ und\l:12 1:12 tby3:12 over 3:12\ 3 Mech. fastener not req'd 4 Mech. fastener required Not permitted under 2:12 \ 2:12 to 3:12 \ Mech. fastener no' t -req'd 3 Mech. fastener required * over 3:12 \Sarae as 2:12 to 3:12, but plies laid parallel to slope of deck under %:12 3s:12 to 2:12 2:12 to 3:12 over 3:12 Not permitted \3 Mech. fastener not req'd Mech. fastener required 4 Same as 2:12\o 3:12, but plies laid parallel to slope of deck \ REV. SEP 84- BIRD 012939 Tootnotes for Table 32 P Wdgd nailers provided in non-nailable .decks shall be spaced at no more than\8 feet face to face# when mechanical fasteners are required for securtnY the roofing membrane. Wood insulation stops, the same thickness as the insulation, shall be spaced at no morYthan 8 feet fare fa face, when mechanical fasteners are required for securing the roofing membrane. 's^spkcil Roofing manufacturer^ specifications may require mechanical fasteners at slopes lower than stated\n^this code requirement. Roofing plies and cap sheet sha!l\e blind nailed using mechanical \\ fasteners in accordance with rec^mVeYenfcs shomn in Table No-Sa-E. \ \ REV. SEP 84 DELETE ENTUEL^ TABLE 32 G BIRD 012941 TABLE 32 U . Built-up roofing .Cementing adhesive application rate Material to be adhered Base ply or vapor retarder 1 Spot mopping 2. Solid -cementing 2 Minimum application rate, material/100 ft. roof area Hot asphalt . Hot coal-tar bitumen Cold process cement 15 lbs. 20 lbs. 15 lbs. 25 ^flflbs. 2jal 1% gal. m Insulation 1. Solid cementing 20 lbs. 25 Jfl^lbs. l^_gaJL. Roofing plies (and between layers of vapor retarder) 1. Felts 2. Coated Felts 3. Glass fiber felts 4. Coated glass fiber fel ts 20 lbs. 20 lbs. 25 lbs. 20 lbs. Cap sheets 20 lbs. 25 ^ibs. 25 lbs. 25 Xf lbs. 2S yS lbs. not permitted 1*5 gal. 1*5 gal. 1*5 qal. not permitted 1*5 gal. Rev jam as BIRD 012942 TABLE 32 X Built-up roofing Pour coat requirement for -adhering- aggregate surfacing Mineral aggregate1 FIRE RETARDANT ROOF COVERINGS Gravel, 4001/sq. Slag, 300#/sq. ---------------------------------------------------------------------------------------------, Minimum application rate, material/100 ft roof area Asphalt .Coal-tar bituwen so ^geribs. SO ^Ibs. (fi ^Tlbs. 6p lbs. 9 ORDINARY ROOF COVERINGS Gravel, 300#/sq. Slag, 250#/sq. 40 JSC'lbs. 40 .SOT lbs. SO >T1bs. so .fin bs. Mineral aggregate (hall net be uted for fcult-vp roofing membrane* at root elope* greater Vian S incite* m VZiinefc<s. TABLE 32 X Built-up roofing Pour coat requirement for -adhering- aggregate surfacing Mineral aggregate1 FIRE RETARDANT ROOF COVERINGS Gravel, 4G0#/sq. Slag, 300#/sq. Minimum application rate* material/100 ft2 roof area Asphalt Coal-tar bitumen 50 ^eribs. SO ^lbs. 6p jrns. 60 JHr lbs. TM ORDINARY ROOF COVERINGS Gravel, 300#/sq. Slag, 250#/sq. 40 jBflribs. 40 rSO'lbs. 50 jjO'lbs. SO jBQ^lbs. Mineral aggregate shall not be vttA far kuilt-t>p roofing membrane* at roof slope* greater -than % inches in 12 inches. RtV J* 05 BIRD 012943