ROOFING APPLICATION STANDARD (RAS) No. 120 · PDF fileROOFING APPLICATION STANDARD (RAS) No. 120 ... feet or at the rate if so stated in the Product Approval. Adhesiveshall ... . 1

2010 FLORIDA BUILDING CODE — TEST PROTOCOLS HVHZ (RAS) 120.1

Scope1.

This application standard covers the proceduresfor installation of mortar or adhesive set roof tilesystems. This standard shall be used in conjunc-tion with the tile manufacturer’s Product Ap-proval and RAS 127.

Definitions2.

For definitions of terms used in this applicationstandard, refer to ASTM 1079 and the FloridaBuilding Code, Building.

NOTE #1: The following table provides thecontractor with the choicesavailable for underlayment sys-tems. These systems can only beused on pitches designated in thetable below:

ROOFING APPLICATION STANDARD (RAS) No. 120MORTAR AND ADHESIVE SET TILE APPLICATION

Roof Pitch Choice of Underlayment

Plastic or Compatible RoofCement at Nails Penetrating

Underlayment Reference

2:12 or greater

1. ASTM D 226 Type II#30 or ASTM D 2626(#43) inorganic base nailedto deck, min ASTM D6380, Class M or WS, TypeII (#90) organic cap sheetset in Type IV hot asphalt.

Required 3.01 A

2. Any product approvedunderlayment system witha mechanically fastenedbase sheet, and cap sheetset hot, cold, or selfadhered.

per Product Approval 3.01 B, C, D or E

This Roofing Application Standard covers flat, lowand high-profile roof tile, using a minimum 2 in. tileheadlap, or design limited headlap as specified intile manufacturer’s Product Approval. Installed onminimum 15/32 in. solid decking nailed in compli-ance with Chapter 23 (High-Velocity HurricaneZones) of the Florida Building Code, Building.

PART I - GENERAL

1.01

A. Tiles shall not be installed overwet underlayment where moistureprohibits adhesion of mastic, mor-tar, or adhesive.

PART II - MATERIALS

2.01 Fasteners:

A. Tile Fasteners:

1. All roof tile nails or fasten-ers, except those made ofcopper, Monel, aluminum,or stainless steel, shall betested for corrosion in com-pliance with TAS 114 Ap-pendix E, Section 2 (ASTMG 85), for salt spray for1000 hours. Tile fastenersused in coastal buildingzones, as defined in Chapter16 (High-Velocity Hurri-cane Zones), Florida Build-ing Code, Building shall becopper, monel, aluminum,or stainless steel.

2. All roof tile fasteners shall beof sufficient length to pene-trate a minimum 1/2 in.through the thickness of thedeck or to penetrate into a 1in., or greater, thickness oflumber not less than 1 in.

B. Underlayment Fasteners:

1. Fasteners shall be incompliance with Section1523 of the FloridaBuilding Code, Building(herein referred to as“Approved Fasteners”).

(aa) Nails shall be mini-mum 12 gage, an-nular ring shanknails having notless than 20 ringsper inch; heads notless than 3/8 in. indiameter; andlengths sufficient topenetrate throughthe plywood panelor wood plankdecking not lessthan 3/16 in., or topenetrate into a 1in., or greater,thickness of lumbernot less than 1 in..Nails shall be hotdipped; electro ormechanically gal-vanized to a thick-ness sufficient toresist corrosion incompliance withAppendix E ofTAS 114. All nailsshall be Miami-Dade listed for cor-rosion resistance.All nail cartons orcarbon labels shallbe labeled to notecompliance withcorrosion-resis-tance requirements.

(bb) Such fasteners shallbe applied through“tin caps” not lessthan 15/8 in. and notmore than 2 in. indiameter and of notless than 32 gage(0.010 in.) sheet

(RAS) 120.2 2010 FLORIDA BUILDING CODE — TEST PROTOCOLS HVHZ

(RAS) No. 120

metal. All tin capsshall be Miami-Dadelisted for corrosion re-sistance.

(cc) Prefabricated fastenersystems complyingwith Section 1517.5,Florida BuildingCode, Building maybe used, provided theyare Miami-Dadelisted for corrosion re-sistance.

2.02 Metal Flashing:

A. Flashing materials shall complywith the requirements set forth inChapter 15 (High-Velocity Hurri-cane Zones) of the Florida Build-ing Code, Building.

1. Metal accessories for roofsshall be not less than 26gage galvanized, 28 gagestainless steel, 16 ouncecopper, 0.024 inch (0.61mm) thick aluminum, leadsheet with a minimum 2.5lb/sf or equivalent non- cor-rosive lead metal alloys orcomposite materials manu-factured for use as roof ter-mination. All compositeand nonmetallic flashingmaterials shall have Prod-uct Approval.

2. Metal accessories may be ofa manufactured, shop fabri-cated or field fabricatedtype, provided the materialsand fasteners are in compli-ance with the minimum re-quirement of this Code andshall be installed in compli-ance with methods set forthin RAS 111.

2.03 Asphaltic Adhesive:

A. Asphalt plastic roof cement - con-forming to ASTM D 4586, Type

II, nonasbestos, nonrunning,heavy body material composedof asphalt and other mineral in-gredients.

B. Cold process modified bitu-men roofing mastic - conform-ing to ASTM D 3019, Type III.

C. Asphalt - conforming toASTM D 312, Type IV.

2.04 Adhesive/Sealant:

A. Structural bonding adhesive -conforming to ASTM 3498.

2.05 Mortar:

A. Materials:

1. Roof tile mortar shall ei-ther be a premixed unithaving an Product Ap-proval and tested in com-pliance with TAS 123 ora job site mix approvedby the building officialand in compliance withRAS 113.

B. Mixes:

1. Sand/cement mixes, jobmixed or premixed, shallmeet ASTM C 270 re-quirement for Type Mmortar (2.25 to 2.5:1sand to cement ratio).

2. Lightweight aggre-gate/cement mortar mustbe premixed and bagged.

2.06 Eave Closure—CHOOSE ONE ofthe following:

A. Prefabricated EPDM syntheticrubber conforming to ASTM D1056.


(RAS) No. 120

B. Prefabricated metal eave closuremust contain minimum 3/8 in. diam-eter weepholes, spaced not morethan 12 in. apart, flush with theunderlayment.

C. Prefabricated concrete or clayeave closure.

.

D. Mortar (color optional) on granu-lar surface underlayments only.

E. Antiponding drip edge.

2.07 Sheathing Material shall conform toAPA rated sheathing, in compliancewith Chapter 23 (High-Velocity Hurri-cane Zones) of the Florida BuildingCode, Building.

A. Battens-material to be decay re-sistant species or pressure treatedin compliance with AWPA LP-2or better.

PART III - EXECUTION

3.01 Underlayment Applications - CHOOSEONE of the following:

NOTE #2: Anchor/base sheet shall have aminimum of two plies in the val-leys. Cap-sheets for mortar setsystems shall be mineral surfaced.A No. 30 or No. 43 can be used asa dry-in prior to installing theunderlayment with this system.

A. Hot Mop 30/90, Hot Mop 43/90(See Drawing 1). A No. 30 or No43 anchor/base sheet ASTM D226, Type II, or ASTM D 2626shall be mechanically attached tothe wood deck with approved fas-teners spaced in a 12 in. grid stag-gered in two rows in the field, and6 in. on center at the laps. Extendanchor/base sheet a minimum of 4in. up vertical surfaces. An-chor/base sheet end laps shall be aminimum of 6 in. and head lapsshall be a minimum of 4 in. Overinstalled anchor/base sheet, applyone layer of mineral surfaced cap

sheet ASTM D 6380M in full25 lb./sq, ± l5 percent moppingof asphalt. End laps shall be aminimum of 6 in.; head lapsshall be a minimum of 3 in. andback nailed 12 in. on centerwith approved nails throughtincaps or by Miami- Dadelisted prefacbricated fastenersin accordance with FloridaBuilding Code, Building1517.5.1 and 1517.5.2.

NOTE #3: The above system may be up-graded by hot mopping aninterply of ASTM listed fiber-glass or perforated organic feltto the anchor sheet before ap-plying the cap sheet. Asphaltapplication shall be per abovespecifications.

B. Hot Applied Product Ap-proved Underlayment System(see Drawing 1). An an-chor/base sheet shall be me-chanically attached to thewood deck (unless directedotherwise by Product Ap-proval) with approved fasten-ers spaced in a 12 in. gridstaggered in two rows in thefield, and 6 in. on center at thelaps or as specified in theunderlayment manufacturer’sProduct Approval . An-chor/base sheet end laps shallbe a minimum of 6 in. and headlaps shall be a minimum of 4in. Over installed anchor/basesheet, apply one layer of capsheet in a full 25# /sq. ±15 per-cent mopping of asphalt. Endlaps shall be a minimum of 6in. on center; head laps shall bea minimum of 3 in. andbacknailed 12 in. on centerwith approved nails throughtincaps or by prefabricated fas-teners in accordance withFlorida Building Code, Build-ing 1517.5.1 and 1517.5.2.

C. Cold Applied ProductApproved UnderlaymentSystem (see Drawing 1). Ananchor /base sheet shall be me-chanically attached to the wood


(RAS) No. 120

deck with approved fastenersspaced in a 12 in. grid staggered intwo rows in the field and 6 in. oncenter at the laps or as specified inthe underlayment manufacturersProduct Approval. Anchor/basesheet end laps shall be a minimumof 6 in. and head laps shall be aminimum of 4 in. Over an-chor/base sheet, apply one layerof cap sheet in a continuous layerof cold process adhesive at therate of 1.5 gallons per 100 squarefeet or at the rate if so stated in theProduct Approval. Adhesive shallbe applied uniformly in accor-dance with Product Approvalwith a squeegee or knotted brush.Cap sheet side laps shall be a mini-mum of 6 in.; head laps shall be aminimum of 3 in. and backnailed12 in. on center with approvednails through tincaps or by prefab-ricated fasteners in accordancewith Florida Building Code,Building 1517.5.1 and 1517.5.2.

D. Product Approved Anchor/BaseS h e e t / S e l f - A d h e r e dUnderlayment System. The roofcover is terminated at approvedmetal flashings. Any approved an-chor/base sheet as listed in theProduct Approval shall be me-chanically attached to the wooddeck with approved fastenersspaced in a 12 in. grid staggered intwo0ws in the field and 6 in. oncenter at the laps or as specified inthe underlayment manufacturersProduct Approval. Anchor/basesheet end laps shall be a minimumof 6 in. and head laps shall be aminimum of 4 in. Over anchor/base sheet, apply one layer of anyProduct approved, self-adheredunderlayment in compliance withthe self-adhered underlaymentmanufacturers’ Approval/Re-quirements.

E. Self-Adhered Underlayment(Single Ply). A single-plyunderlayment system utilizingany Product approved self-ad-hered underlayment. The roofcover is terminated at approvedmetal flashings. Apply one layer

of any self-adheredunderlayment in compliancewith the underlayment manu-facturers’ approved/require-ments.

3.02 Drip Edge Metal - CHOOSE ONE ofthe following:

NOTE #4: Drip edge deck flange shall beprimed with ASTM D 41 as-phalt primer.

A. Two-ply underlayment sys-tems (See Drawing 2).

1. Drip edge metal shall beinstalled over anchor/basesheet, fastened 4 in. oncenter with approved 11/4


(RAS) No. 120

DRAWING 2DRIP EDGE INSTALLATION

DRAWING 1TYPICAL 30/90 HOT MAP

in. roofing nails or approvedfasteners. All joints shall belapped a minimum of 4 in.ensuring water shedding ca-pabilities and apply ap-proved plastic roof cementbetween laps.

B. When drip edge metal shall be in-stalled at eaves and gables over atwo ply underlayment system:The metal profile shall be placedin a minimum 3/16 in. bead of con-tinuous ASTM D 4586 plasticroof cement and fastened 4 in. oncenter with approved 1 1/4 in. roof-ing nails or approved fasteners.All metal joints shall be lapped aminimum of 4 in. ensuring watershedding capabilities and applyapproved plastic roof cement be-tween laps. The metal profile andcap sheet shall be joined with atwo ply application of cotton or fi-berglass fabric reinforcement,both set in a full bed of approvedplastic roof cement. As an alter-nate, the metal may be stripped inwith a 6'' strip of torch, hot asphaltor cold adhesive polyester rein-forced modified bitumen. Jointsshall be feathered with cold adhe-sive, hot asphalt or a torch to en-hance water flow across the"backlap."

C. Single-Ply Underlayment Sys-tems:

1. Drip-edge metal shall be in-stalled at the eave, over theunderlayment or in accor-dance with the underlaymentmanufacturer’s Product Ap-proval. The metal shall befastened 4 in. on center withapproved 11/4-in. roofingnails or approved fasteners ofcompatible metals. All jointsshall be lapped a minimum of4 in. ensuring water sheddingcapabilities and apply ap-proved plastic roof cement be-tween laps.

2. Strip in metal with a mini-mum 6 in. strip of the sin-gle-ply underlayment or in

accordance with theunderlayment manufac-turer’s Product Approval,using primer and/or ap-proved compatible masticif so directed by single plymanufacturer’s require-ments.

3.03 Valleys - CHOOSE ONE of the fol-lowing:

NOTE #5: All metal surfaces to receivecap sheet shall be primed withASTM D 41 asphalt primer.

A. Two ply system - choose oneof the following:

1. Preformed or roll metalwithout returns 16'' wideshall be placed over theanchor/base sheet in thevalley and shall be fas-tened 6 in. on center with12 ga. corrosion-resis-tant roof nails, or otherapproved fasteners ofcompatible metals nearthe outside edge of thevalley metal. All jointsshall be lapped a mini-mum of 6 in. ensuringwater shedding capabili-ties and apply approvedplastic roof cement be-tween laps (see Drawing3).

2. Preformed metal with-out returns or standardroll metal 16 in. wideshall be placed in the val-ley on top of the capsheet and fastened 6 in.on center with 12 ga.corrosion-resistant roofnails, or other approvedfasteners of compatiblemetals near the outsideedge of the valley metal.All joints shall be lappeda minimum of 6 in. en-suring water sheddingcapabilities and applyapproved plastic roof ce-


(RAS) No. 120

ment between laps. The capsheet shall be joined with 1/8-in. bed of plastic roof ce-ment and a 4-in. strip of as-phalt saturated cotton orfiberglass fabric. The fabricshall be fully embedded inthe plastic roof cement. Anoptional #90 sweat sheet 36in. wide may be appliedprior to the installation ofthe valley metal and capsheet.

B. Single-Ply System (See Drawing4):

1. Preformed metal withoutreturns 16 in. wide shall beplaced in the valley andshall be installed and fas-tened 6 in. on center with 12ga., corrosion-resistant roofnails, or other approved fas-teners of compatible metalsnear the outside edge of thevalley metal. All jointsshall be lapped a minimumof 6 in., ensuring watershedding capabilities andapply approved plastic roofcement between laps. Theunderlayment shall bejoined with a bed of plasticroof cement and a 4-in. stripof asphalt saturated cottonor fiberglass fabric or in ac-cordance with theunderlayment manufac-turer’s Product Approval.The fabric shall be fully em-bedded in the plastic roofcement. An optional #90sweat sheet 36 in. wide maybe applied prior to the in-stallation of the valley metaland cap sheet.

2. Standard roll metal 16 in.wide shall be placed overthe anchor or cap sheet inthe valley and shall be fas-tened 6 in. on center within1 in. of outside edge withapproved 12 ga. corro-sion-resistant roof nails, orother approved fasteners ofcompatible metals near the

outside edge of the val-ley metal. All joints shallbe lapped a minimum of6 in., ensuring watershedding capabilitiesand apply approvedplastic roof cement be-tween laps.


(RAS) No. 120

DRAWING 4VALLEY METAL STRIPPED IN

DRAWING 3TYPICAL VALLEY INSTALLATION

3.04 Flashing and Counter Flashings at WallAbutments

NOTE #6: In no case shall top of verticalflashing be less than 2 in. abovetile surface.

NOTE #7: Flashing deck flange shall beprimed with ASTM D 41 AsphaltPrimer.

NOTE #8: Head/apron flashing may be in-stalled on top of cap sheet in ac-cordance with 3.04.A.3.

A. Two-Ply System - (Choose 1 or 2)(see Drawings 5, 6 and 7).

1. Install minimum 4 in. x 5 in.“L” metal flush to base ofwalls with 4 in. flange onthe anchor/base sheet andfasten 6 in. on center within1 in. of outside edge. Alljoints shall be lapped a min-imum of 4 in., ensuring wa-ter shedding capabilitiesand apply approved plasticroof cement between laps.Fasten the vertical and hori-zontal flange of metalwithin 1 in. of out side edgea minimum of 6 in. on cen-ter.

2. Install minimum 4 in. x 5 in.“L” metal on the top ply andfastened 6 in. on center with12 ga. corrosion resistantroof nails, or other ap-proved fasteners of compat-iblemetals within 1 in. ofoutside edge of the metal.All joints shall be lapped aminimum of 4 in., ensuringwater shedding capabilitiesand apply approved plastic

roof cement betweenlaps. Fasten verticalflange of metal within 1in. of outside edge a min-imum of 6 in. on center.Cap sheet shall be joinedwith a bed of plastic roofcement and a 4 in. stripof asphalt saturated cot-ton or fiberglass fabric.The fabric shall be fullyembedded in the plasticroofing cement.

3. Head/apron flashingmay be installed on topof cap sheet. Ensure thedeck flange conforms tothe pitch of the roof andextend minimum 4 in.onto deck fasten accord-ing to 3.04, A.1. Sealalong edge with plasticroof cement and mem-brane.

4. Seal along top edgewithin 1 in. of verticalflange, covering all fastener penetrations withapproved plastic roof ce-ment and membrane.

5. When installing optionalcounter flashing, lap topflange of base flashingminimum 3 in. Fastenmetal within 1 in. of theoutside edge a minimumof 6 in. on center or setinto reglets (securedproperly) and thor-oughly caulk. Lap jointsminimum 4 in. ensuringwater shedding capabili-ties and apply approvedplastic roof cement/seal-ant between laps.


(RAS) No. 120

B. Single-Ply System.

1. Install 4 in. x 5 in. “L” metalflush to base of side wallswith 4 in. flange over thesingle-ply underlaymentand fasten 6 in. on centernear the metals edge. Alljoints shall be lapped a min-imum of 4 in., ensuring wa-ter shedding capabilitiesand apply approved plasticroof cement between laps.Mechanically fasten verti-cal flange of metal within 1in. of outside edge a mini-mum of 6 in. on center nearthe edge of the metal.

2. Seal along top edge of verti-cal flange, covering all fas-tener penetrations withapproved plastic roof ce-ment and membrane.

3. All head/apron flashingshall be installed on top ofcap sheet. Ensure the deckflange conforms to the pitchof the roof and extend mini-mum 4 in. onto deck andfastened in accordance with3.04, B.1. Seal along edgewith plastic roof cement andmembrane.

4. When installing optionalcounter flashing, lap topflange of base flashing aminimum of 3 in. Fastenmetal within 1 in. of outsideedge a minimum of 6 in. oncenter or set metal intoreglets and seal thoroughly.Lap joints a minimum of 4in. ensuring water sheddingcapabilities and apply plas-tic roof cement or sealantbetween the laps.

3.05 Standard Curb Mounted Skylights,Chimneys, etc. (see Section 3.04 above).

A. Curbs shall be a minimum 2 in. x 6in., and a minimum 2 in. above up-

permost adjacent finished tilesurface.

B. Flashing shall follow instruc-tions in 3.04 A or B in this Sys-tem.

NOTE #9: For self-curbing or prefabri-cated skylights, curb height


(RAS) No. 120

DRAWING 5WALL FLASHING DETAIL

(COUNTER FLASHING WITH CAULKED BEAD)

DRAWING 6WALL FLASHING DETAIL(STUCCO STOP DETAIL)

shall be min. 6 in. and 2 in. abovemost adjacent finished tile surfaceand installation shall be in accor-dance with skylight manufac-turer’s Product Approval. Forturbines and other Product ap-proved accessories refer to the ac-cessories manufacturer’s ProductApproval.

3.06 Pipes, Stacks, Vents, etc., (see Drawings8 & 9).

A. Apply approved plastic roof ce-ment around base of protrusionand on the bottom side of metalflanges sealing unit base flashingto the underlayment.

.

B. Nail all sides within 1 in. of out-side edge of base flashing 6 in. oncenter. Make certain base is flushto deck.

NOTE #10: If pipes, vents and/or stacks are in-stalled after finished cap sheet hasbeen applied, follow instructionsin 3.06 A & B. Cap sheet andmetal flange shall be stripped inwith at least the same cap sheetfelt in use on this system. Strip-ping must extend at least 4 in. be-yond flange in all directions.

3.07 Tile Installation:

A. Eave Treatment - CHOOSEONE of the following:

NOTE #11: All fastener penetrations shallbe sealed.

1. Prefabricated EPDMSynthetic Rubber - In-stall closure strip alongeave. Fasten each piece


(RAS) No. 120

DRAWING 7WALL FLASHING DETAIL

(WALL FLASHING OVER CAP SHEET)

LEAD STACK DETAIL(OVER THE CAPSHEET)

DRAWING 8

LEAD STACK DETAIL(OVER THE BASE SHEET)

DRAWING 9

at 12 in. on center (seeDrawing 10 all fastenerpenetration shall be sealedwith compatible material).

2. Metal Eave Closure - Installclosure strip along eave.Fasten a minimum 12 in. oncenter with approved fas-teners. If metal is inclusiveof drip edge, fasten 4 in.on center (see Drawing 11).

3. Raised Fascia/Wood StarterStrip when using a 3/4 in.raised fascia, a nominal 2 in.x 2 in. wood starter stripmust be installed behindfascia.

(aa) Install fascia board ap-proximately 11/2 in.above roof deck or anominal 2 in. x 2 in.wood starter strip atroof edge (see Draw-ing 12).

(bb) Install 8 in. taperedcant strip at eave be-hind fascia and/orstarter strip to supportmetal flashing. In-stall a minimum 8 in.wide antipondingmetal flashing to en-sure positive drainageover fascia/starterstrip. Fasten top edgeof flange onto roofand fasten eave edgeto raised fascia detailwith approved fasten-ers 4 in. on center.

4. Prefabricated Concrete orClay Eave Closure - fas-tened in accordance withmanufacturer’s ProductApproval with approvedfasteners.

NOTE #12: All fastener penetrations shall besealed.

5. Mortar Application - Installmortar to elevate eave edge.

(aa) Apply mortaralong the eaveedge, applyingenough mortar toelevate the eaveend of the tile to beon profile with theremaining rooftile.

(bb) Point and smoothfinish flush to eaveline.

(cc) Apply minimum3/8 in. weep holeflush with the roofunderlayment atspacing of not lessthan one weepholeper tile.

(dd) Mortar eave clo-sures shall only beused with granulars u r f a c eunderlayment.

NOTE #13: Tile shall be attached to resistthe design pressures for thebuilding. See Chapter 16(High-Velocity HurricaneZones) of the Florida BuildingCode, Building and RAS 127.See tile manufacturer’s Prod-uct Approval for attachmentresistance values, which mustexceed the required calculateddesign pressures of the struc-ture.

A. Mortar /Adhesive Application:Low, High and Flat Profile Tile(see Drawings 13).

1. Set tile in a bed of ap-proved mortar/adhesive.Apply 10 in. minimumlength trowel of mortaror required amount ofadhesive vertically un-


(RAS) No. 120

der pan. For flat tile placemortar/adhesive verticallyadjacent to the overlock ofthe tile being installed. Donot apply mortar underheadlug of tile, or onto theunderlock of adjacent tile.(Unless otherwise specifiedin adhesive’s manufactur-ers Product Approval)

2. Use half starter/finisher tilewhen provided or cut/breaktile for proper staggering oftile courseswhen using thestaggered/cross bondmethod of installation.

3. Set tile in stepped coursefashion or in a horizontaland/or vertical fashionwhen utilizing straightbond method.

4. Lay succeeding course offield tile in same manner.

5. Cut/break field tile to formstraight edge at center ofhip/ridge.

NOTE #14: Mortar or adhesive set tile shall beapplied at inclines of 2:12 andgreater. For pitches of 6 in.: 12 in.up to and including 7 in.: 12 in.nail every tile in the first courseand every third tile in every fifthcourse in addition to mortar or ad-hesive. For pitches above 7 in.:12in. nail every tile in addition tomortar or adhesive. Apply ap-proved flashing cement to seal allnail penetrations. Fastening re-quirements at slope of 7:12 or lessfor Two-Piece Barrel applicationapplies to pan tiles only. No mor-tar or adhesive products shall beapplied in a manner which pre-

vents drainage of water undertiles.

B. Two-Piece Barrel Tile Mortaror Adhesive Application (seeDrawing #14):

1. Apply 10 in. mason’strowel of mortar or re-quired amount of adhe-sive in accordance withthe tile system ProductApproval vertically overchalk line and under cen-ter of each pan with narrow end facing downroof.

2. Place bed of mortar orrequired amount of ad-hesive in accordancewith the tile systemProduct Approval alonginside edges of pans andset covers with wide endfacing down roof.

3. Point mortat to form ac-ceptable straight-edgefinish ensuring contactalong edges. Cosmeticuse of mortar is accept-able for use with adhe-sive set tiles.

.

4. Lay succeeding coursesof field tile in same man-ner. Bed of mortar or ad-hesive should makecontact with head oflower course of tile andunderside of tile beingset.

5. Cut/break field tile toform straight edge atcenter of hip/ridge.


(RAS) No. 120

3.08 Valleys - CHOOSE ONE of the fol-lowing:

NOTE #15: It may be necessary to removethe lugs from the field tile atwalls and valley flashings forproper positioning of cut fieldtiles.

A. Standard Roll Valley


(RAS) No. 120

DRAWING 10EAVE TILE DETAIL

EPDM EAVE CLOSURE


(METAL EAVE ENCLOSURE)


ANTIPONDING METAL

DRAWING 13MORTAR (ADHESIVE) SET TILE

DRAWING 14BARREL TILE INSTALLATION

1. Closed valley - Miter tile tomeet at center of valley.

2. Open Valley - Chalk a line aminimum 2 in. on both sidesof the valley center. Placebed of mortar along outsideedge of chalk lines. Mitertile to form straight borderand point to match tile sur-face.

B. Preformed Metal Without Re-turns

1. Closed valley - Miter tile toform straight border on ei-ther side of water diverter.

2. Open Valley - Miter tile toform straight border on ei-ther side of two water di-verters.

3.09 Hip Starter - CHOOSE ONE of the fol-lowing:

A. Prefabricated hip starter.

1. Miter tile as hip starter tomatch eave lines.

B. Use standard hip tiles as starter.

3.10 Hip and Ridge Nailer Boards or Pre-formed Metal Channel (see Drawing15) - Details 1, 2, 3 and 4 are also ac-cepted methods of installing Hip andRidge Nailer Boards. (Approved adhe-sive in lieu of nails or screws, is permit-ted when using Details 2 and 3.)

A. Wood nailers or preformed metalchannel shall be required and at-tached in compliance with Chap-ter 16 (High-Velocity Hurricane

Zones) of the Florida BuildingCode, Building.

B. Wood nailer boards shall be se-cured with hot dipped zinccoated galvanized steel strapsof a minimum thickness of 1/8

in. by 11/4 in. wide. The galva-nized steel straps shall be in-stalled at a maximum spacingof 12 in. on center along thelength of the ridge nailerboards. Steel straps shall bebent to fit over the ridge nailerboards, and shall be secured tothe sheathing with a minimumof six #6 - #8 corrosion resis-tant screws per strap, at a maxi-mum spacing of 4 in. on center.

C. Preformed Metal Channel

Preformed Metal Channelsshall be secured 6 in. on centerwith approved fasteners. Allfastener penetrations shall besealed with plastic roof ce-ment.

D. Hip and Ridge Tile Installation- CHOOSE ONE of the follow-ing:

1. Self-adhered Mem-brane:

(aa) Install self-ad-hered membraneover nailer boardand seal to tile sur-face per membranemanufacturer’srecommendation.

(bb) Instal l hip andridge tiles withcorrosion resistantapproved nails or


(RAS) No. 120

screws and of suffi-cient length to pene-trate a minimum of3/4 in. into nailerboard lapping tile aminimum of 2 in.(Approved adhesive,in lieu of nails orscrews, is permittedwhen using Details 2and 3. When usingadhesive hip andridge tiles shall be in-stalled in accordancewith the adhesivemanufacturer’s Prod-uct Approval.)

(cc) Use approved adhe-sive or clips at over-laps.

2. Mortar:

(aa) Set hip and ridge tilein a continuous bed ofmortar, lapping tile aminimum 2 in. En-sure bed of mortardoes not protrude incenter of hip or ridgejunction. Approxi-mately 1 inch (25mm) of field tile shallextend beyond bed ofmortar.

(bb) Install hip and ridgetiles with approvedcorrosion resistantnails or screws of suf-ficient length to pene-trate a minimum of3/4 in. into nailerboard. (Approved ad-hesive, in lieu of nailsor screws, is permit-ted when using De-tails 2 and 3. Whenusing adhesive, hipand ridge tiles shallbe installed in accor-dance with the adhe-sive manufacturer’sProduct Approval.)


(RAS) No. 120

DRAWING 15RIDGE BLOCKING DETAIL

DETAIL 1

DETAIL 2

(cc) Point mortar tofinish surface.

3.11 Rake/Gable - CHOOSE ONE of thefollowing:

A. Rake/Gable Tile:

1. Install first rake tile theexposed length of firstcourse of field tile withfactory finish of rake tiletowards the eave.

2. Fasten each rake tile withaminimum of two 10Dnails of sufficient lengthto penetrate the framing aminimum of 3/4 in.

3. Abut each succeedingrake tile to the nose of thefield tile above andmaintain a constantheadlap.

B. Mortar Finish:

1. Place mortar bed alongroof edge.

2. Point smooth to astraight edge finish.

3.12 Wall Abutments

A. Cut tile to fit approximately 1/2

in. to base of walls. Point-upmortar is optional.

B. Headwall abutment shall bepointed with mortar.

3.13 Plumbing Stacks

A. Cut tiles to fit close to plumb-ing stack. Fill void with mortarand point to finish.


(RAS) No. 120

SEAL ALL NAIL PENETRATION

DETAIL 3

SHEET PLATE DETAIL

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Documents

ROOFING APPLICATION STANDARD (RAS) No. 120 · PDF fileROOFING APPLICATION STANDARD (RAS) No. 120 ... feet or at the rate if so stated in the Product Approval. Adhesiveshall ... . 1