SECTION 07551

PROTECTED MEMBRANE BUILT-UP ASPHALT ROOFING

PART	GENERAL

SECTION INCLUDES

[Sheathing over metal deck surface.]

Membrane roofing, insulation, ballast cover, base flashings, membrane joints [, and cant strips].

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

Section [_____-__________]: Placement of [recessed] strip reglet devices.

PRODUCTS INSTALLED BUT NOT FURNISHED UNDER THIS SECTION

Section 05311 - Steel Roof Deck: Supply of acoustical insulation for deck flutes.

Section [______-____________]: [Flashing devices] [Special coated metal counter flashings] [________].

RELATED SECTIONS

Section [______-____________]: Roof deck surface.

Section [______-____________]: No-fines concrete functioning as a ballast over the insulation.

Section 03451 - Architectural Precast Concrete: Precast paver ballast.

Section 06114 - Wood Blocking and Curbing: Wood nailers [and cant strips].

[Section 07565 - Preparation for Re-Roofing.]

Section 07620 - Sheet Metal Flashing and Trim: Counter flashing and [________].

Section 07710 - Manufactured Roof Specialties: Counter flashings and [________].

Section 07724 - Roof Hatches: Counter flashings and [________].

Section 07810 - Plastic Skylights: Skylight frame, [integral curb,] [counter flashing,] and [________].

Section 08952 - Translucent Panel System: Counter flashings and [________].

Section 08960 - Sloped Glazing: Counter flashings and [________].

Section 15430 - Plumbing Specialties: Roof [drains] [sumps] [hoppers] [________].

Section [______-____________]: Flashing collars.

Section [______-____________]: Prefabricated curb for mechanical equipment.

Section [_____-__________]: Lightning protection.

REFERENCES

ASTM C79 - Test Method for Gypsum Sheathing Board.

ASTM C177 - Test Method for Steady-State Thermal Transmission Properties by Means of the Guarded Hot Plate.

ASTM C578 - Preformed, Cellular Polystyrene Thermal Insulation.

ASTM D41 - Asphalt Primer Used in Roofing, Dampproofing, and Waterproofing.

ASTM D226 - Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing.

ASTM D249 - Asphalt Roll Roofing (Organic Felt) Surfaced with Mineral Granules.

ASTM D312 - Asphalt Used in Roofing.

ASTM D1227 - Emulsified Asphalt Used as a Protective Coating for Roofing.

ASTM D1863 - Mineral Aggregate for Use on Built-Up Roofs.

ASTM D2178 - Asphalt Glass Felt Used in Roofing and Waterproofing.

ASTM D2626 - Asphalt-Saturated and Coated Organic Felt Base Sheet Used in Roofing.

ASTM D2822 - Asphalt Roof Cement.

ASTM D3672 - Venting Asphalt-Saturated and Coated Inorganic Felt Base Sheet Used in Roofing.

ASTM D3909 - Asphalt Roll Roofing (Glass Felt) Surfaced with Mineral Granules.

ASTM D448 - Classification for Standard Sizes of Aggregate and Bridge Construction.

ASTM E96 - Water Vapor Transmission of Materials.

FM (Factory Mutual) - Roof Assembly Classifications.

SPRI (Single Ply Roofing Institute) - Wind Design Guide for Ballasted Single Ply Roofing Systems.

NRCA (National Roofing Contractors Association) - Roofing and Waterproofing Manual.

UL (Underwriters Laboratories, Inc.) - Fire Hazard Classifications.

SYSTEM DESCRIPTION

Protected Membrane Built-up Asphalt Roofing System: Four ply asphalt membrane system, separation sheet placed over membrane, loose laid insulation, water pervious fabric, and [aggregate] [paver] [concrete] ballast.

NRCA Specification Plate: [________].

Criteria for Ballasting Membrane System: SPRI - Wind Design Guide for Ballasted Single Ply Roofing Systems System [1] [2] [3], Exposure [E.] [P.]

SUBMITTALS

Submit under provisions of Section [01300.] [________.]

Shop Drawings: Indicate [joint or termination detail conditions,] [conditions of interface with other materials,] [and] [paver ballast cover pattern].

Product Data: Provide data indicating membrane and bitumen materials, base flashing materials, insulation, [pavers,] [and] [________].

Submit [two] [____] sample [[1] [____] lb ([0.5] [____] kg) containers of roofing aggregate ballast.] [pavers.]

Manufacturer's Installation Instructions: Indicate special procedures, perimeter conditions requiring special attention, and [________].

Manufacturer's Certificate: Certify that [Products] [________] meet or exceed [specified requirements] [________].

Manufacturer's Field Reports: Submit under provisions of Section [01400] [________]:

Indicate procedures followed; ambient temperatures, humidity, wind velocity during application, supplementary instructions given, [and] [________].

QUALITY ASSURANCE

Perform Work in accordance with [NRCA Roofing and Waterproofing Manual.] [manufacturer's instructions.]

Maintain [one copy] [[____] copies] of [each] document on site.

QUALIFICATIONS

Manufacturer: Company specializing in manufacturing the Products specified in this section with minimum [five] [_______] years [documented] experience.

Applicator: Company specializing in performing the work of this section [with minimum [three] [____] years [documented] experience.] [approved by manufacturer.]

REGULATORY REQUIREMENTS

Conform to [applicable] [__________] code for roof assembly fire hazard requirements.

Fire Resistance Rating: [Roof] [Floor] assembly rating of [________] in accordance with [UL Design No. [____].] [____.]

UL: Class [A] [B] [C] Fire Hazard Classification.

FM: Roof Assembly Classification, wind uplift requirement of [I60] [I90], in accordance with FM Construction Bulletin 1-28.

PRE-INSTALLATION CONFERENCE

Convene [one] [_____] week prior to commencing work of this section, under provisions of Section [01039.] [________.]

Review preparation and installation procedures and coordinating and scheduling required with related work.

DELIVERY, STORAGE, AND HANDLING

Deliver, store, protect and handle products to site under provisions of Section [01600.] [________.]

Deliver products in manufacturer's original containers, dry, undamaged, with seals and labels intact.

Store products in weather protected environment, clear of ground and moisture.

Protect foam insulation from direct exposure to sunlight.

ENVIRONMENTAL REQUIREMENTS

Do not apply roofing membrane during unsuitable weather [when ambient temperature is below [40] [____] degrees F ([5] [____] degrees C) or above [____] degrees F ([____] degrees C)].

Do not apply roofing membrane to damp or frozen deck surface or when precipitation is occurring.

Do not expose materials vulnerable to water [or sun damage] in quantities greater than can be weatherproofed the same day.

COORDINATION

Coordinate work under provisions of Section [01039.] [________.]

Coordinate the work with installation of associated counter flashings installed by other sections as the work of this section proceeds.

WARRANTY

Provide [two] [____] year warranty under provisions of Section [01700.] [________.]

Warranty: Cover damage [to building] resulting from failure to prevent penetration of water.

PART	PRODUCTS

MANUFACTURERS - SHEET AND BITUMEN MATERIALS

[__________________________________] System [_________].

Other acceptable manufacturers offering equivalent products.

[______________________________] System [_________].

[______________________________] System [_________].

[______________________________] System [_________].

Substitutions: Under provisions of Section [01600.] [________.]

SHEET MATERIALS

Asphalt Saturated Organic Felts: ASTM D226, No. [15] [20] [30]; [unperforated.] [perforated.]

****** [OR] ******

Glass Fiber Felts: ASTM D2178, Type [III.] [IV.] [VI.]

Base Sheet: [ASTM D2626, No. 43, plain] [ASTM D3672, No. [____], vented] asphalt saturated and coated inorganic base sheet.

Mineral Surfaced Felts: [ASTM D249 No. 90] [ASTM D3909]; [white] [black] [________] colored mineral granules.

Dry Sheathing Paper: [Clean, white cellulose] [ASTM D549 red rosin] paper, unsaturated.

BITUMINOUS MATERIALS

Asphalt Bitumen: ASTM D312, Type [I.] [II.] [III.] [IV.]

Asphalt Primer: ASTM D41.

Plastic Cement: ASTM D2822 Type [I] [II], cutback asphalt type.

Asphalt Emulsion: ASTM D1227, Type [I.] [II.]

DECK COVERING MATERIALS

Gypsum Sheathing: [ASTM C79,] Fire rated type, paper face, [5/8] [____] inch ([16] [____] mm) thick.

INSULATION

Manufacturers:

[_________________________________] Type [________].

[_________________________________] Type [________].

[_________________________________] Type [________].

Insulation: [ASTM C578 Type VI,] extruded expanded polystyrene board with natural skin surfaces; [drainage channels one face,] [________] manufactured by [________________], with the following characteristics:

Board Density	[1.9] [____] lb/cu ft ([30][____] kg/cu m)

Board Size	[__ x __] inch ([__ x __] mm)

Board Thickness	[____] inches ([____] mm)

Thermal Conductivity	K factor of [0.20] [____] (KSI factor of [0.35] [____]) as determined by ASTM C177.

Board Edges	Square.

****** [OR] ******

Concrete Clad Insulation: [ASTM C578 Type VI,] extruded polystyrene board, factory bonded to a latex modified Portland cement concrete layer 3/8 inch (9 mm) thick on one face, drainage channels opposite face; [________] manufactured by [________________], with the following characteristics:

Average Board Density	[____] lb/cu ft ([____] kg/cu m)

Board Size	[__ x __] inch ([__ x __] mm)

Board Thickness	[____] inches ([____] mm)

Thermal Conductivity	K factor of [0.20] [____] (KSI factor of [0.35] [____]) as determined by ASTM C177.

Board Edges	Square.

Insulation Perimeter Restraint: Metal edge device configured to restrain insulation boards in position and provide top flashing over ballast.

FLASHINGS

Flexible Flashings: [EPDM] [Butyl] [Neoprene] [Modified bitumen, SPS type] [________]; [black] [white] color; [________] manufactured by [________________].

****** [OR] ******

Flexible Flashings: [EPDM] [Butyl] [Neoprene] [Modified bitumen, SPS type] [________]; conforming to the following:

Thickness:	[____] mil ([____] mm).

Maximum Perm Rate:	[____].

Tensile Strength:	[1,200] [____] psi ([8.3] [____] MPa).

Elasticity:	[50] [____] percent with full recovery without set.

Color:	[black] [white] [________].

Manufactured Roof Specialties: As specified in Section [07710.] [________.]

****** [OR] ******

Prefabricated Control [or Expansion] Joint Flashing: Sheet [butyl] [________] over close cell foam backing seamed to metal flanges; [________] manufactured by [_____________].

****** [OR] ******

Control [or Expansion] Joint Flashing: [Sheet [butyl] [________], metal counter flashings and [wood] [________] materials, as detailed.

****** [OR] ******

Control [or Expansion] Joint Flashing: [Sheet [butyl] [________], metal counter flashings and [wood] [________] materials, in accordance with NRCA Construction Details [____], [____] and [____].

BALLAST

Aggregate: [ASTM D448, Gradation [#57] [____];] Sound, hard, washed, [crushed gravel,] [stone,] [3/4] [____] inch ([19] [____] mm) minimum to [1.5] [____] inch ([38] [____] mm) maximum size. Fine aggregate of less than 5/8 inch (16 mm) nominal size, dirt, or organic material is not acceptable.

****** [OR] ******

Pavers: Precast concrete units, [4,000] [____] psi ([28] [____] MPa) air entrained mix; [24 x 24 x 2] [________] inch ([600 x 600 x 50] [___x___x___] mm) size, [smooth] [broom] [________] finish.

****** [OR] ******

Pavers: [________], [________] manufactured by [____________].

Pedestals: [Injection molded weathering grade plastic, [cruciform] [________] shape, configured to permit adjustment to height] [________________]; [________] manufactured by [____________].

Water Pervious Fabric: Black, open to moisture movement, [woven polyethylene] [non-woven polyester] [non-woven polyethylene] [________________], U.V. stabilized; [________] manufactured by [________________].

Separation Sheet: [Sheet polyethylene] [________]; [2] [4] [____] mil ([0.05] [0.1] [____] mm) thick.

CANTS

Fiber Cant and Tapered Edge Strips: Asphalt impregnated wood fiberboard, preformed to [45 degree angle.] [tapered edge strip.] [configuration as detailed.]

****** [OR] ******

Wood Cant Strip: Specified in Section [06114] [________], [pressure] preservative treated.

ACCESSORIES

Sheathing Adhesive: Non-combustible type, for adhering gypsum sheathing to metal deck.

***** [OR] *****

Sheathing Fasteners: Appropriate for purpose intended and approved by Factory Mutual [and system manufacturer]; length required for thickness of material [with metal washers]; [________] manufactured by [____________].

Sheathing Joint Tape: [Paper] [Heat resistant] [________] type, [____] inch ([____] mm) wide, self adhering.

Strip Reglet Devices: [Galvanized steel] [Extruded plastic] [________], maximum possible lengths per location, with attachment flanges.

Roofing Nails: [Galvanized, hot dipped] [Non-ferrous] type, size and configuration as required to suit application.

Protective Paint: [White] [________] color latex, residential quality.

PART	EXECUTION

EXAMINATION

Verify that surfaces and site conditions are ready to receive work.

Verify deck is supported and secure.

Verify deck is clean and smooth, flat, free of depressions, waves, or projections, properly sloped to [drains] [valleys,] [or] [eaves], and suitable for installation of roof system.

Verify deck surfaces are dry and free of snow or ice.

Confirm dry deck by moisture meter with [12] [____] percent moisture maximum.

Verify adjacent precast concrete roof members do not vary more than 1/4 inch (6 mm) in height. Verify grout keys are filled flush.

****** [OR] ******

Verify adjacent plywood sheets do not vary more than 1/4 inch (6 mm) in height.

Verify roof openings, curbs, pipes, sleeves, ducts, and vents through roof are solidly set, and [wood cant strips] [wood nailing strips] [and reglets] are in place.

PREPARATION - WOOD DECK

Verify flatness and tight joints of wood decking. [Seal joints of plywood with tape.] Fill knot holes with latex filler.

Lay one ply of dry sheathing paper; lap edges 2 inches (50 mm).

Lay asphalt coated base sheet; lap edges 4 inches (100 mm). Nail laps 6 inches (150 mm) oc. Nail the field area at 12 inches (300 mm) oc staggered.

Apply glaze coat of hot asphalt to top surface of prepared deck if membrane is not installed immediately following deck preparation.

Extend [two plies of felt] [one ply of flexible flashing] from [12] [____] inches ([300] [____] mm) around roof perimeter to roof edge and onto wall air seal material with [____] inches ([____] mm) of lap; seal air tight.

Mop cant strips in place with hot bitumen.

****** [OR] ******

PREPARATION - CONCRETE DECK

Fill surface honeycomb and variations with latex filler.

Lay a two ply strip of dry applied felt 18 inches (450 mm) wide over precast concrete deck joints.]

Apply asphalt primer at [1] [____] gal/square ([48] [____] L/100 sq m) and allow to dry.

Apply glaze coat of hot asphalt to top surface of prepared deck if membrane is not installed immediately following deck preparation.

Extend [two plies of felt] [one ply of flexible flashing] from [12] [____] inches ([300] [____] mm) around roof perimeter to roof edge and onto wall air seal material with [____] inches ([____] mm) of lap; seal air tight.

Mop cant strips in place with hot bitumen.

****** [OR] ******

PREPARATION - METAL DECK

[Install preformed sound absorbing glass fiber insulation strips supplied by Section [05311] [________], in acoustic deck flutes; in accordance with manufacturer's instructions.]

Install gypsum sheathing on metal deck [using continuous mopping of adhesive on each flute] [with fasteners] [________].

Lay with long side at right angle to flutes; stagger end joints; provide support at ends.

Cut sheathing cleanly and accurately at roof breaks and protrusions to provide smooth surface. Tape joints.

Mechanically fasten sheathing at full roof area using [6] [8] [____] fasteners with washers per sheathing board.

****** [OR] ******

Mechanically fasten sheathing at roof perimeter to a distance of [4] [____] ft ([1.5] [____] m) in from edges using [6] [8] [____] fasteners with washers per board.

****** [OR] ******

Mechanically fasten sheathing to roof deck, in accordance with [Factory Mutual] [manufacturer's instructions] [________].

Apply roller coat of primer to top of sheathing surfaces. Allow to dry.

Apply glaze coat of hot asphalt to top surface of prepared deck if membrane is not installed immediately following deck preparation.

Extend [two plies of felt] [one ply of flexible flashing] from [12] [____] inches ([300] [____] mm) around roof perimeter to roof edge and onto wall air seal material with [____] inches ([____] mm) of lap; seal air tight.

Mop cant strips in place with hot bitumen.

MEMBRANE APPLICATION

[Lay one ply coated base sheet, coated side down. Lap sides 2 inches (50 mm); lap ends 6 inches (150 mm).]

Equiviscous Temperature (EVT) at Point of Application: In accordance with NRCA.

Apply [3] [4] plies of roof felt [over coated base ply,] weather lap edges and ends, mopped with [20] [____] lb/square ([98] [____] kg/100 sq m) of bitumen per ply. [Apply felt 2 on 2 in [same] [opposite] direction.]

Apply felts smooth, free from air pockets, wrinkles, fishmouths, or tears.

Extend [base ply and] membrane felts up cant strips and minimum of [4] [6] [____] inches ([100] [150] [____] mm) onto vertical surfaces. Mop on two additional plies of felt and one ply of granular surfaced felt as base flashings over roofing membrane plies. Secure to [nailing strips at [4] [____] inches ([100] [____] mm) oc] [and] [reglets].

Install two plies membrane and bitumen glaze coat for cut-off at end of day's operation. Glaze felts exposed at end of working day. Remove cut-off before resuming roofing.

Mop and seal two additional plies of felt around roof penetrations.

Apply uniform flood coat of bitumen at rate of [60] [____] lb/square ([293] [____] kg/100 sq m).

Place separation sheet over final flood mopping of bitumen, lap edges and ends [2] [____] inches ([50] [____] mm).

FLASHINGS AND ACCESSORIES

Apply [granular surfaced felt] [flexible] base flashings to seal membrane to vertical elements.

Install prefabricated roofing [control] [and] [expansion] joints to isolate roof into areas [as indicated.] [in accordance with manufacturer's instructions.]

***** [OR] *****

Fabricate roofing [control] [and] [expansion] joints to isolate roof into areas as indicated.

Coordinate installation of roof [drains] [sumps] [________] and related flashings to NRCA Drawing [W-1] [____].

Mop in and seal flashings and flanges of items penetrating membrane with two plies of felt.

INSTALLATION - CONCRETE CLAD INSULATION

Place concrete clad insulation boards; butt in close contact.

Place channel cut face down. Bevel insulation to allow snug fit at cant strips. Cut neatly around protrusions through roof.

Minimum Total Insulation Thickness: [[____] inch ([____] mm).] [As required to achieve an insulation R value of [____] (RSI value of [____]).]

Place and fit perimeter restraint to minimize movement of insulation boards.

****** [OR] ******

APPLICATION - UNCLAD INSULATION

Place insulation boards; butt in close contact. [Place channel cut face down.] Bevel insulation to allow snug fit at cants. Cut neatly around protrusions through roof.

Minimum Total Insulation Thickness: [[____] inch ([____] mm).] [As required to achieve an insulation R value of [____] (RSI value of [____]).]

Place water pervious fabric over insulation boards in accordance with insulation manufacturer's instructions.

Apply aggregate ballast, applied dry and at the rate of [1,000] [____] lb/square ([4 900] [____] kg/100 sq m).

[Evenly distribute aggregate cover.] [Evenly distribute over general roof area; at parapet area increase ballast to [____] lb/square.]

****** [OR] ******

Install precast concrete pavers [provided under Section [03451] [________]].

Install pavers [directly on insulation.] [on paver pedestals.] Provide approximately [1/4] [3/8] [____] inch ([6] [9] [____] mm) space between pavers to permit surface water drainage.

****** [OR] ******

Install paver system in accordance with manufacturer's instructions. [Place pavers in [________] pattern.]

****** [OR] ******

Install [no-fines] concrete topping specified under Section [03300.] [________.]

Set roof drain inlets at membrane level and top grating at [finish deck level] [top of insulation] [________].

FIELD QUALITY CONTROL

Field inspection [and [field [laboratory] testing] will be performed under provisions of Section [01410.] [________.]

Correct identified defects or irregularities.

Require site attendance of roofing [and insulation] materials' manufacturers [daily] [________] during installation of the Work.

[Field] [Laboratory] Testing: [To ascertain bitumen quantities placed.] [________.]

CLEANING

Remove bituminous markings from finished surfaces.

In areas where finished surfaces are soiled by bitumen or any other source of soiling caused by work of this section, consult manufacturer of surfaces for cleaning advice and conform to their [documented] instructions.

Repair or replace defaced or disfigured finishes caused by work of this section.

PROTECTION OF FINISHED WORK

Where traffic must continue over finished roof membrane, protect surfaces.

END OF SECTION