07 51 13 Built Up Asphalt Roofing-1111(Nov).pdf

IDIQ ROOF MAINTENANCE/REPAIR/REPLACEMENT VNVP 111080

07 51 13 Built Up Asphalt Roofing

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November 2011

07 51 13

BUILT-UP ASPHALT ROOFING

PART 0 - INTENT

0.1 This guide specification covers the requirements for aggregate surfaced bituminous built-up roofing, and built-up roofing with granule-surfaced modified bitumen cap sheet on slopes from 1/4 inch to 1-1/2 inch per foot.

0.2 The requirements for hot-mopped, four-ply, aggregate surfaced, built-up bituminous roofing systems and built-up bituminous roof systems consisting of three-ply felts and granule-surfaced modified bitumen cap sheet are included in this guide specification.

PART 1 - GENERAL:

1.1. REFERENCES: The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)

ANSI/SPRI RD-1 (2003) Performance Standard for Retrofit Drains

AMERICAN SOCIETY OF CIVIL ENGINEERS (ASCE)

ASCE/SEI 7-05 (2005; R 2006) Minimum Design Loads for Buildings and

Other Structures ASTM INTERNATIONAL (ASTM)

ASTM C 1153 (1997; R 2003e1) Standard Practice for Location of Wet

Insulation in Roofing Systems Using Infrared Imaging

ASTM C 208 (2008a) Cellulosic Fiber Insulating Board

ASTM C 728 (2005) Perlite Thermal Insulation Board

ASTM D 1863 (2005) Mineral Aggregate Used on Built-Up Roofs

ASTM D 1864/D 1864M (1989e1; R 2009) Moisture in Mineral Aggregate

Used on Built-Up Roofs

ASTM D 1970 (2009) Self-Adhering Polymer Modified Bituminous Sheet

Materials Used as Steep Roofing Underlayment for Ice Dam Protection

ASTM D 2170 (2007) Kinematic Viscosity of Asphalts (Bitumens)

ASTM D 2178 (2004) Asphalt Glass Felt Used in Roofing and

Waterproofing

ASTM D 312 (2000; R 2006) Standard Specification for Asphalt Used in

Roofing

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ASTM D 3617 (2007) Sampling and Analysis of New Built-Up Roof

Membranes

ASTM D 41 (2005) Asphalt Primer Used in Roofing, Damp proofing, and

Waterproofing

ASTM D 4402 (2006) Viscosity Determination of Asphalt at Elevated

Temperatures Using a Rotational Viscometer

ASTM D 448 (2008) Sizes of Aggregate for Road and Bridge Construction

ASTM D 4586 (2007) Asphalt Roof Cement, Asbestos-Free

ASTM D 4601 (2004) Asphalt-Coated Glass Fiber Base Sheet Used in

Roofing

ASTM D 4869 (2005; E 2006) Standard Specification for Asphalt-Saturated

Organic Felt Underlayment Used in Steep Slope Roofing

ASTM D 4897/D 4897M (2001; R 2009) Asphalt-Coated Glass-Fiber

Venting Base Sheet Used in Roofing

ASTM D 517 (1998; R 2008) Asphalt Plank

ASTM D 6162 (2000a; R 2008) Styrene Butadiene Styrene (SBS) Modified

Bituminous Sheet Materials Using a Combination of Polyester and

Glass Fiber Reinforcements

ASTM D 6163 (2000; R 2008) Styrene Butadiene Styrene (SBS) Modified

Bituminous Sheet Materials Using Glass Fiber Reinforcements

ASTM D 6164 (2005e1) Styrene Butadiene Styrene (SBS) Modified

Bituminous Sheet Materials Using Polyester Reinforcements

ASTM D 6757 (2007) Standard Specification for Underlayment Felt

Containing Inorganic Fibers Used in Steep-Slope Roofing

ASTM E 108 (2007a) Fire Tests of Roof Coverings

FM GLOBAL (FM)

FM 4470 (1986; R 1992) Class I Roof Covers

FM APP GUIDE (updated on-line) Approval Guide http://www.approvalguide.com/CC_host/pages/public/custom

NATIONAL ROOFING CONTRACTORS ASSOCIATION (NRCA)

NRCA 0405 (2001; R 2003, 5th Ed) Roofing and Waterproofing Manual

UNDERWRITERS LABORATORIES (UL)

UL 790 (2004; R 2008) Standard for Test Methods for Fire Tests of Roof

Coverings

UL RMSD (2009) Roofing Materials and Systems Directory

1.2. DESCRIPTION OF ROOF MEMBRANE SYSTEMS:

http://www.approvalguide.com/CC_host/pages/public/custom

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Asphalt applied, four-ply felt, aggregate surfaced built-up roof membrane system.

Asphalt applied, three-ply felt, aggregate surfaced built-up roof membrane system.

Asphalt applied, three-ply felt with granule-surfaced modified bitumen cap sheet built-up roof membrane system.

1.3. SUBMITTALS: Submit the following in accordance with Section 01 33 00

SUBMITTAL PROCEDURES:

SD-03 Product Data wind uplift calculations

Asphalt

Felts, including ply felt, base sheet and ventilating felt as applicable; G

Granule Surface Modified Bitumen Cap Sheet; G

FLASHING MEMBRANE; G

Fasteners

Primer

Asphalt Roof Cement

Walkpad Materials

Vapor Pressure Relief Vents

Cant Strips

Certificate attesting that the fiberboard furnished for the project contains recovered material, and showing an estimated percent of such recovered material.

Pre-Manufactured Accessories to be incorporated in the system installation;

G

Roof Walkways

Sample warranties certificates; G

Submit all data required with requirements of this section. Include in

Data written acceptance by the roof membrane manufacturer of the products and accessories provided. List products in the applicable wind uplift and fire rating classification listings, unless approved otherwise by the Contracting Officer.

SD-06 Test Reports

Samples of Built-Up Roofing

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Submit test results on roofing field samples as required, verifying composition of sample. Submit six copies of laboratory analysis within

30 calendar days after samples are taken. Submit reports in accordance with ASTM D 3617.

SD-07 Certificates bill of lading

Submit when labels of asphalt containers do not indicate the finished blowing temperature, flash point and equiviscous temperature.

Qualifications of Applicator

Submit evidence of the roofing system manufacturer's approval.

SD-08 Manufacturer's Instructions:

Felts; G

Flashings; G

Modified bitumen cap sheet; G

Base Sheet attachment, including pattern and frequency of mechanical attachments required in field of roof, corners, and perimeters to provide for the specified wind resistance.

Asphalt

Primer

Roof cement

Fasteners

Cold weather conditions installation; G

Include detailed application instructions and standard manufacturer drawings altered as required by these specifications. Include membrane manufacturer requirements for nailers and backnailing of roof membrane on steep slopes. Explicitly identify in writing, differences between manufacturer's instructions and the specified requirements.

SD-11 Closeout Submittals

WARRANTY

INFORMATION CARD

1.4. QUALITY ASSURANCE

1.4.1. Qualifications of Applicator: The roofing system applicator must be approved, authorized, or licensed in writing by the roofing system manufacturer and must have a minimum of 3 years experience as an approved, authorized, or licensed applicator with the manufacturer and be approved at a level capable of providing the specified warranty.

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1.4.2. Fire Resistance: Complete roof covering assembly must:

a. Be Class A rated in accordance with ASTM E 108 , FM 4470, or UL 790;

and

b. Be listed as part of Fire-Classified roof deck construction in UL RMSD, or Class I roof deck construction in FM APP GUIDE.

1.4.3. Wind Uplift Resistance: Rate complete roof covering assembly, including insulation, as Class 1 A with a wind uplift pressure rating of 90 psf in accordance with FM APP GUIDE. Do not install non-rated systems except as approved by the Contracting Officer. Submit licensed engineer's wind uplift calculations and substantiating data to validate any non-rated roof system. Base wind uplift measurements on a design wind speed of 100 mph in accordance with ASCE/SEI 7-05 and/or other applicable building code requirements.

1.4.4. Preroofing Conference: After approval of submittals and before performing roofing system installation work, hold a preroofing conference to review the following:

a. Drawings and specifications and submittals related to the roof work;

b. Roof system components installation;

c. Procedure for the roof manufacturer's technical representative's onsite inspection and acceptance of the roofing substrate, the name of the manufacturer's technical representatives, the frequency of the onsite visits, distribution of copies of the inspection reports from the manufacturer's technical representatives to roof manufacturer;

d. Contractor's plan for coordination of the work of the various trades involved in providing the roofing system and other components secured to the roofing; and

e. Quality control plan for the roof system installation;

f. Safety requirements.

Coordinate preroofing conference scheduling with the Contracting Officer.

The conference must be attended by the Contractor, the Contracting

Officer's designated personnel, and personnel directly responsible for the installation of roofing and insulation, flashing and sheet metal work, and other trades interfacing with the roof work and other base agencies as determined by contracting officer. Before beginning roofing work, provide a copy of meeting notes and action items to all attending parties. Note action items requiring resolution prior to start of roof work.

1.5. DELIVERY, STORAGE, AND HANDLING:

1.5.1. Delivery: Deliver materials in manufacturers' original unopened containers and rolls with manufacturer's labels intact and legible. Mark and remove wet or damaged materials from site. Where materials are covered by a

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November 2011 referenced specification, container must bear specification number, type, and class, as applicable. Indicate on labels or bill of lading for roofing asphalt the asphalt type, finished blowing temperature (FBT), flash point (FP), and equiviscous temperature (EVT), that is, the temperature at which the viscosity is either 125 centistokes when tested in accordance with ASTM D 2170 or 75 centipoise when tested in accordance with ASTM D 4402. Deliver materials in sufficient quantity to allow work to proceed without interruption.

1.5.2. Storage: Protect materials against moisture absorption, contamination, or other damage. Avoid crushing or crinkling of roll materials. Store roll materials on end on clean raised platforms in dry locations in enclosed buildings or trailers with adequate ventilation. Do not store roll materials in buildings under construction until concrete, mortar, and plaster work are finished and dry. Do not store materials outdoors unless approved by the Contracting Officer.

Completely cover felts stored outdoors, on and off roof, with waterproof canvas protective covering. Do not use polyethylene sheet as a covering. Tie covering securely to pallets to make completely weatherproof and yet provide sufficient ventilation to prevent condensation. Maintain roll materials at temperature above

50 degrees F for a 24-hour period immediately prior to application. Keep aggregate dry as defined by ASTM D 1863. Place only those materials to be used during one day's work on the roof at one time. Remove unused materials from the roof at the end of each day's work. Immediately remove wet, contaminated or otherwise damaged or unsuitable materials from the site.

Damaged materials may be marked by the Contracting Officer.

1.5.3. Handling: Prevent damage to edges and ends of roll materials. Do not install damaged materials in the work. Select and operate material handling equipment so as not to damage materials or applied roofing.

1.6. ENVIRONMENTAL CONDITIONS: Do not install roofing during

precipitation, or fog, or when air temperature is below 40 degrees F, or when there is ice, frost, moisture or visible dampness on roof deck.

1.7. SEQUENCING: Coordinate the work with other trades to ensure that components which are to be secured to or stripped into the roofing system are available and that permanent flashing and counterflashing are installed as the work progresses. Ensure temporary protection measures are in place to preclude moisture intrusion or damage to installed materials. Application of roofing must immediately follow application of insulation as a continuous operation. Coordinate roofing operations with insulation work so that all roof insulation applied each day is covered with complete felt ply installation the same day.

1.8. WARRANTY: Provide roof system material and workmanship warranties meeting specified requirements. Provide revision or amendment to standard membrane manufacturer warranty to comply with the specified requirements.

1.8.1. Roof Membrane Manufacturer Warranty: Furnish the roof membrane manufacturer's 5, 10, or 20 -year no dollar limit roof system materials and

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November 2011 installation workmanship warranty, including flashing, insulation, and accessories necessary for a watertight roof system construction. Write the warranty directly to the Government commencing at the time of Government's acceptance of the roof work. Provide the following statement for such warranty:

a. Buildings with roof area of 75 squares or greater, administrative, classroom and other high use facilities, and facilities with sensitive use, contents, equipment, or functions require minimum 20 year warranty. All environmentally controlled interiors require a minimum 10 year roof warranty. Designer may specify 5 or 10 year manufacturer warranty on facilities of small roof area and of minor importance where interiors and contents are not severely impacted by water.

b. If within the warranty period the roof system, as installed for its intended use in the normal climatic and environmental conditions of the facility, becomes non-watertight, shows evidence of moisture intrusion within the assembly, blisters, splits, tears, delaminates, separates at the seams, or shows evidence of excessive weathering due to defective materials or installation workmanship, the repair or replacement of the defective and damaged materials of the roof system assembly and correction of defective workmanship are the responsibility of the roof membrane manufacturer. All costs associated with the repair or replacement work are the responsibility of the roof membrane manufacturer.

c. The warranty must remain in full force and effect, including emergency temporary repairs performed by others, when the manufacturer or his approved applicator fail to perform the repairs within 72 hours of notification.

1.8.2. Roofing System Installer Warranty: The roof system installer must warrant for a minimum period of five years that the roof system, as installed, is free from defects in installation workmanship, to include the roof membrane, flashing, insulation, accessories, attachments, and sheet metal installation integral to a complete watertight roof system assembly. Write the warranty directly to the Government. The roof system installer is responsible for correction of defective workmanship and replacement of damaged or affected materials. The roof system installer is responsible for all costs associated with the repair or replacement work.

1.8.3. Continuance of Warranty: Approve repair or replacement work that becomes necessary within the warranty period and accomplished in a manner so as to restore the integrity of the roof system assembly and validity of the roof membrane manufacturer warranty for the remainder of the manufacturer warranty period.

1.9. CONFORMANCE AND COMPATIBILITY: The entire roofing and flashing system must be in accordance with specified and indicated requirements, including fire and wind resistance requirements. Work not specifically addressed and any

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November 2011 deviation from specified requirements must be in general accordance with recommendations of the NRCA 0405, membrane manufacturer published recommendations and details, and compatible with surrounding components and construction. Submit any deviation from specified or indicated requirements to the

Contracting Officer for approval prior to installation.

PART 2 - PRODUCTS:

2.1. GENERAL: Furnish a combination of specified materials that comprise the membrane manufacturer's standard system of the number and type of plies specified.

Materials provided must be approved by the roof membrane manufacturer and suitable for the service and climatic conditions of the installation.

2.2. FIBERGLASS FELT MATERIALS: Perforated venting base sheet option shall be specified for application directly on concrete deck. Base sheets with perforations are rolled into place and then top mopped with hot asphalt. Base sheets without perforations are mechanically attached to nailable substrates.

a. Venting Base Sheet: ASTM D 4897/D 4897M, Type II, with or without perforations and as approved by the roof membrane manufacturer.

b. Fiberglass Felt Base Sheet: ASTM D 4601, Type II, with or without perforations and as approved by the roof membrane manufacturer.

c. Ply Felt: ASTM D 2178, Type IV or VI.

2.3. BASE FLASHING MEMBRANE: ASTM D 6163. Membrane manufacturer's standard, minimum two-ply modified bitumen membrane flashing system compatible with the built-up roof membrane and as recommended in membrane manufacturer's published literature. Provide a minimum base ply of flashing membrane of 70 mils thick. Provide a minimum granule surface modified bitumen flashing cap sheet of

120 mils thick on the selvage edge.

2.4. ASPHALT: Asphalt applied and approved shall be based on roof slope.

Roof Slope (inches/foot) Asphalt Type

Less than 1/2 inch/foot Type II, Type III in hot climate

1/2 to 1 inch/foot Type III

1 to 1-1/2 inch/foot Type III, Type IV in hot climate.

NOTE: In locations where ambient temperature frequently exceeds 100 degrees

F and roof slope is 1/2 inch per foot or greater, specify Type IV asphalt.

ASTM D 312, Type II, III or IV, in accordance with membrane manufacturer requirements and compatible with the slope conditions of the installation.

2.5. SURFACING MATERIAL:

2.5.1. Aggregate for Surfacing Built-up Roofing: Water-worn gravel, crushed stone, or crushed slag, conforming to ASTM D 1863, or marble, expanded slag, 07 51 13 Built Up Asphalt Roofing

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November 2011 or expanded shale, conforming to ASTM D 1863 except density not less than 55 pcf. Aggregate conforming to gradation sizes No. 6, No. 7, and No. 67 in conformance with ASTM D 448 is acceptable provided other requirements of

ASTM D 1863 are met. Provide 2 percent maximum moisture content as determined by ASTM D 1864/D 1864M. Provide light colored and opaque aggregate. Limestone, volcanic rock, crushed shells, and cinders are prohibited.

2.5.2. Granule Surface Modified Bitumen Cap Sheet: ASTM D 6164; Type II, Grade G, minimum (120 mils) thick at selvage edge, and as required to provide specified fire safety rating. Used for high puncture resistance and for high traffic roofs.

2.6. PRIMER: ASTM D 41 for asphalt roofing systems and as approved by the membrane manufacturer.

2.7. ASPHALT ROOF CEMENT: ASTM D 4586 for use with asphalt roofing systems, Type II for vertical surfaces and built-up bituminous flashings; Type I for horizontal surfaces and as recommended by the membrane manufacturer.

2.8. CANT STRIPS:

2.8.1. Use wood cant in non-supported flashing and wood blocking details (i.e., expansion joints, area dividers, and wall/roof intersections where roof deck is not supported by a wall).

2.8.2. Standard cant strips must be of perlite conforming to ASTM C 728 or woodfiber conforming to ASTM C 208 treated with bituminous impregnation, sizing, or waxing and fabricated to provide maximum 45 degree change in direction of membrane. Provide minimum 1-1/2 inch thick cant strips and provide for minimum 5 inch face and 3-1/2 inch vertical height when installed at

45 degree face angle, except where clearance restricts height to lesser dimension.

2.9. UNSATURATED FELT OR ROSIN-SIZED BUILDING PAPER: Provide

rosin-sized sheathing paper weighing minimum 5 pounds per 100 square feet or unsaturated felt weighing approximately 7-1/2 pounds per 100 square feet. Install unsaturated felt or rosin-sized building paper under base sheet on wood decks substrates to prevent bitumen drippage through deck joints.

2.10. FASTENERS AND PLATES: Coated, corrosion resistant fasteners compatible with components being attached and contact surfaces. Conform to FM 4470 for fasteners for attachment to deck substrate of Class I roof deck construction and FM

APP GUIDE for the wind resistance specified. Use hard copper fasteners in contact with copper; aluminum or stainless steel fasteners in contact with aluminum; and stainless steel fasteners in contact with stainless steel. For fastening only roofing felts, use fasteners driven through metal discs, or one-piece composite fasteners with heads not less than 1 inch in diameter or 1 inch square with rounded or 45-degree tapered corners.

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2.10.1. Wood Substrates and Nailers: Provide 11 gage annular threaded shank nails with 7/16 to 5/8 inch diameter heads; or one-piece composite nails with annular threaded shanks not less than 11 gage for securing felts and metal items.

Provide fasteners long enough to penetrate minimum 1 inch into or minimum

1/4 inch through wood substrate materials. Do not penetrate wood decking exposed to view on the underside.

2.10.2. Masonry or Concrete Walls and Vertical Surfaces: Provide hardened steel nails or screws with flat heads, diamond shaped points, and mechanically deformed shanks not less than 1 inch long for securing felts, metal items, and accessories. Use power-driven fasteners only when approved in writing by

Contracting Officer.

2.10.3. Metal Plates Flat corrosion-resistant round stress plates as recommended by the modified bitumen sheet manufacturer's printed instructions and meeting the requirements of FM 4470; minimum 2 inch in diameter. Form discs to prevent dishing or cupping.

2.11. PRE-MANUFACTURED ACCESSORIES: Pre-manufactured accessories must be manufacturer's standard for intended purpose, compatible with the membrane roof system and approved for use by the roof membrane manufacturer.

2.11.1. Vapor Pressure Relief Vents: Provide pre-manufactured vents for the purpose of releasing vapor pressure from the roofing system by heat and pressure. Provide one way type designed vents to prevent reverse flow of moisture laden air into roofing system. Valve cap must seal out wind-blown rain and snow and prevent water from entering if submerged.

2.11.1.1. Venting of roof insulation may be advisable when vapor retarder is provided beneath insulation or in recover projects when the old roof membrane remains intact. For roofs requiring venting that are more than 40 feet wide, stack venting should be provided to supplement edge venting.

Underside ventilation for steel decks should consist of continuous openings to 1/8 to 3/16 inch wide between adjacent deck units. Coordinate these requirements with appropriate specification sections.

2.11.2. Pre-fabricated Curbs: Provide G90 galvanized curbs with minimum 4 inch flange for attachment to roof nailers. Provide minimum height of 10 inch above the finished roof membrane surface.

2.12. WALKPADS: Provide polyester reinforced roof walkpads, granule-surfaced modified bitumen membrane material, ASTM D 6162 or ASTM D 6164, minimum

500 mils thick (1/2 inch thick), compatible with the roof membrane and as recommended by the roof membrane manufacturer. Do not exceed 4 feet in length for each panel. Other walkpad materials require approval of the Contracting Officer prior to installation.

2.13. ROOF WALKWAYS: Provide 36 by 72 inch by 1/2 inch thick asphalt planks, consisting of a homogeneous core of asphalt, plasticizers, and fillers bonded between

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November 2011 two saturated and coated facing sheets. Top side must be surfaced with ceramic granules. Conform to ASTM D 517, mineral-surfaced asphalt.

2.14. PAVER BLOCKS: Precast concrete, minimum 1-1/2 inch thick, minimum 18 inch square for walkways and minimum by 6-inch by 12-inch for use in supporting surface bearing components but extending not less than 2 inch beyond all sides of surface bearing bases. Install walkpad material under all paver blocks.

2.15. ROOF INSULATION BELOW MODIFIED BITUMEN MEMBRANE

SYSTEM: Insulation must be compatible with the roof membrane, approved by the membrane manufacturer.

2.16. MEMBRANE LINER: Self-adhering modified bitumen underlayment conforming to ASTM D 1970, EPDM membrane liner conforming to ASTM D

4637, or other waterproof membrane liner material conforming to ASTM D 4869, or

ASTM D 6757, and as approved by the Contracting Officer.

2.17. WARRANTY SIGN: Warranty sign shall be 10” x 12” size, professionally done with block letters proportional to the sign size as shown in the drawings. Signs shall be fabricated of 0.063” or thicker aluminum. Edges shall be sanded with no burrs or sharp edges. Signs shall have a brown background with white lettering.

Background and lettering may be painted or adhering film.

PART 3 - EXECUTION:

3.1 Preparation for Roofing:

3.1.1. Removals must result in a clean and dry substrate, except for residual stains, provide a surface suitable to apply new materials. At substrate surface is suitable when application of new materials results in a uniform positive and maximum bond between such materials and the substrate.

3.1.2. Remove existing rooftop equipment as required for installation of BURS as specified; all equipment remains Government property unless otherwise designated. All roof top equipment shall be reinstalled by the Contractor.

Furnish and install new screws, bolts, and fasteners as required.

3.1.3. Perform painting of surface, to include surface preparation, as described in the paint schedule below. Prepare surfaces. Clean and paint all surfaces on roof top equipment in accordance with the paint schedule below. Any equipment that is damaged by the contractor, during removal or reinstallation, shall be repaired by the contractor, to match existing undamaged condition, at no additional cost to the Government. Paint shall be applied by spray methods.

PAINT SCHEDULE

Surface

Preparation

First

Coat

Second

Coat

Third

Coat

Miscellaneous deteriorated ferrous surfaces

Solvent Wipe

(SSPC#1) followed by Hand Cleaning

TT-P-645 TT-P-489

Class A

TT-P-

Class

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PAINT SCHEDULE

Surface

Preparation

First

Coat

Second

Coat

Third

Coat

(SSPC#2), Power

Tool Cleaning

(SSPC#3) or

Commercial Blast

(SSPC#6)

A

Miscellaneous aluminum surfaces

Solvent Wipe

(SSPS#1)

TT-P-645 TT-P-489

Class A

TT-P-

Class

A

Deteriorated hot ferrous surfaces

(hot stacks) on roofs with mill finish trim

White Metal Blast

(SSPC#5)

TT-P-28 TT-P-28 None

Deteriorated hot ferrous surfaces

(hot stacks) on roofs with prefinished trim

White Metal Blast

(SSPC#5)

Pittsburgh

97-600

Pittsburgh

97-600

None

Hot aluminum surfaces (hot stacks) on roof with prefinished trim.

Solvent Wipe

(SSPC#1)

Pittsburgh

97-600

Pittsburgh

97-600

None

NOTE: SSPC is the abbreviation for the Steel Structures Painting Council and the SSPC # used under the preparation column indicates the SSPC specification under which the surface is to be prepared for painting. For example SSPC#1 indicates Steel Structures Painting Council surface preparation specification #1. SSPC specifications referenced are found in the Steel Structures Painting Council publication: Systems and

Specifications, Steel Structures painting Manual, Volume 2, Fourth Edition, March 1985.

3.1.4. Lift or remove metal and metal accessories indicated to remain to aid the installation of new materials as necessary and as specified herein.

3.1.5. Roof top equipment found to be abandoned at the time of reroofing operations shall be removed and the resulting hole repaired as specified.

Abandoned rooftop equipment shall become the property of the contractor and as such shall be disposed of off the confines of Sheppard AFB.

3.1.6. Repairs to existing deteriorated decking, and repair of holes created by vent/curb unit removal shall be accomplished as described below, “Metal Deck

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Installation”. The contractor shall install sufficient new decking to repair damaged or deteriorated areas or holes created by the removal of abandoned roof top units or penetrations to maintain the structural integrity of the deck.

3.1.7. If conditions are uncovered or created that would be detrimental to the application of specified work, immediately notify the Contracting Officer of such conditions for determination of treatment.

3.1.8. Roof drains shall be removed, replaced or adjusted to accommodate the new roofing system. Existing roof drains shall be protected during construction.

The contractor shall verify the condition of existing roof drains prior to tear-off, either open or clogged, by filling with water. The contractor shall notify the

Government inspector of any clogged drains so that corrective action may be taken. Roof drains found to be clogged shall be cleaned. Failure to notify the

Government inspector of clogged drains will cause the clearing of clogged drains to be the responsibility of the contractor at no additional cost to the

Government.

3.1.9. Existing drains and downspouts shall be protected during construction.

The contractor shall verify the condition of existing downspouts that discharge onto the ground prior to tear-off, either open or clogged, by visual means. The contractor shall verify the condition of existing drains and downspouts that discharge into underground drainage system prior to tear-off, either open or clogged, by visual filling with water. The contractor shall notify the

Government inspector of any clogged drains or downspouts so that corrective action may be taken. Downspouts found to be clogged shall be cleaned. Failure to notify the Government inspector of clogged drains or downspouts will cause the clearing of clogged drains or downspouts to be the responsibility of the contractor at no additional cost to the Government.

3.1.10. METAL DECK INSTALLATION:

3.1.10.1. Remove and replace deteriorated or corroded existing metal decking discovered during reroof with new metal decking of proper thickness, configuration, and finish to match existing decking. Metal decking must always be install to lap over the existing decking a minimum of 1 foot on each side and be securely screwed in place. For large areas, metal decking shall be installed in a two span condition as directed.

3.1.10.2. Install new metal decking of proper thickness, configuration, and finish to cover holes created by equipment or penetration removal. New metal decking shall be of proper thickness, configurations, and finish to match existing decking. Metal decking must always be installed to lap over the existing decking a minimum of 1 foot on each side and be securely screwed in place. For large areas, metal decking shall be installed in a two span condition as directed.

3.1.11. WOOD INSTALLATION:

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3.11.1. Remove and replace deteriorated or rotted existing plywood decking discovered during re-roof with new plywood decking of proper thickness. Plywood decking must always be installed in a minimum two span condition with the strong axis perpendicular to the supporting members.

3.1.11.2. Install new plywood decking of proper thickness to cover holes created by equipment or penetration removal. Plywood decking must always be installed in a minimum two span condition with the strong axis perpendicular to the support members.

3.1.11.3. Remove and replace deteriorated or rotted existing dimensional lumber decking discovered during re-roof with new dimensional lumber decking of proper thickness. Deteriorated or rotted existing tongue and groove decking discovered during re-roof will be removed and replaced with new tongue and groove decking of proper thickness. Dimensional lumber decking must always be installed in a minimum two span condition with the length dimension perpendicular to the supporting members.

Tongue and groove decking must be installed in a simple span or two-span continuous condition with the length dimension perpendicular to the supporting members.

3.1.11.4. Install new dimensional lumber decking or tongue and groove decking of proper thickness to cover holes created by equipment or penetration removal. New dimensional lumber decking or tongue and groove decking shall be proper thickness to match existing decking.

Dimensional lumber decking must always be installed in a minimum two span condition with the length dimension perpendicular to the supporting members. Tongue and groove decking must be installed in a simple span or two-span continuous condition with the length dimension perpendicular to the supporting members.

3.1.11.5. Remove and replace deteriorated or rotted existing wood blocking/nailers discovered during re-roof with new dimensional lumber of proper size.

3.1.11.6. Remove and replace deteriorated or rotted existing miscellaneous wood members discovered during re-roof with new dimensional lumber of proper size.

3.1.11.7. Provide and install new wood blocking/nailers, dimensional lumber, and miscellaneous wood members as indicated on drawings.

3.1.11.8. Provide fasteners at not more than 2 feet 8 inches on-center, and also within approximately 6 inches of each end to secure nailers to the building construction. Threaded fasteners shall be not less than 3/8-inch in diameter and shall be countersunk flush with the top of the nailer. Other fasteners shall be as specified and as shown on the plans.

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3.1.11.9. Where nailers are stacked, secure the top nailer to the lower with spikes or nails of proper length, spaced maximum 18 inches on center, staggered and within approximately 6 inches of all nailer ends. Ends of stacked nailers shall be offset approximately 12 inches in long runs and staggered (alternated) at corners.

3.1.11.10. Brush apply one coat of copper naphthenate solution onto all cut surfaces of preservative treated lumber.

3.1.11.11. Wood cants may be used where they can be securely anchored to prevent warping. Wood cants are considered miscellaneous wood.

3.2. VERIFICATION OF CONDITIONS: Before applying roofing materials, ensure that the following exist:

a. Drains, curbs, cants, control joints, expansion joints, perimeter walls, roof penetrating components, and equipment supports are in place.

b. Surfaces are rigid, clean, dry, smooth, and free of cracks, holes, and sharp changes in elevation. Joints in substrate are sealed to prevent drippage of bitumen into building or down exterior walls. Inspect surfaces and approve immediately before application of roofing and flashings. Apply the roofing and flashings to a smooth and firm surface free from ice, frost, visible moisture, dirt, projections, and foreign materials.

c. The plane of the substrate does not vary more than 1/4 inch within an area 10 by 10 feet when checked with a 10 foot straight edge placed anywhere on the substrate.

d. Substrate is sloped as indicated to provide drainage.

e. Walls and vertical surfaces are constructed to receive counterflashing and will permit mechanical fastening of the base flashing materials.

f. Treated wood nailers are in place on non-nailable surfaces, to permit nailing of base flashing at minimum height of 8 inch above finished roofing surface.

g. Treated wood nailers are fastened in place at eaves, gable ends, openings, and intersections with vertical surfaces for securing of felts, edging strips, attachment flanges of sheet metal, and roof fixtures. Embedded nailers are flush with deck surfaces. Surface-applied nailers are same thickness as roof insulation.

h. Cants are securely fastened in place in the angles formed by walls and other vertical surfaces. The angle of the cant is approximately 45 degrees and the height of the vertical leg is not less than nominal 3-1/2 inch. Lay cants in a solid asphalt mopping or coat of asphalt cement just prior to laying the roofing plies.

i. Venting is provided in accordance with the following:

(1) Edge Venting: Perimeter nailers are kerfed across width of the nailers to permit escape of gaseous pressure at roof edges.

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(2) Underside Venting: Vent openings are provided in steel form decking for cast-in-place concrete substrate.

(3) Vapor pressure relief vents: Holes equal to the outside diameter of vents are provided through the insulation where vents are required. Space vents in accordance with membrane manufacturer's recommendations.

j. Exposed nail heads in wood substrates are properly set. Warped and split boards or sheets have been replaced. There are no cracks or end joints 1/4 inch in width or greater. Knot holes are covered with sheet metal and nailed in place.

Wood or Plywood decks are covered with rosin paper or unsaturated felt prior to base sheet or roof membrane application. Joints in plywood substrates are taped with 2 inch wide masking tape to prevent air leakage from the underside.

k. Insulation boards are installed smoothly and evenly, and are not broken, cracked, or curled. There are no gaps in insulation board joints exceeding 1/4 inch in width. Insulation is being roofed over on the same day the insulation is installed.

l. Cast-in-place concrete substrates have been allowed to cure and the surface dryness requirements specified under paragraph entitled "Field Quality Control" have been met.

m. Joints between precast concrete deck units, including weld plates, are grouted, leveled, and covered with 4 inch wide ply felt or other bituminous stripping membrane set in bituminous cement prior to applying other roofing materials over the area. Prior to application of primer on precast concrete decks, cover joints with a minimum 4 inch strip of felt or bituminous stripping membrane set in bituminous cement.

3.3. PREPARATION: Verify that work of other trades that penetrates the roof deck or requires men and equipment to traverse the roof deck is complete. Examine deck surfaces for inadequate anchorage, foreign material, moisture, and unevenness which would prevent the execution and quality of application. Proceed with the roofing application only after defects have been corrected. Starting work designates acceptance of the surfaces by the Contractor.

3.3.1. Protection of Property:

3.3.1.1. Protective Coverings: Install protective coverings at paving and building walls adjacent to hoists and kettles prior to starting the work. Lap protective coverings not less than six inch, secure against wind, and vent to prevent collection of moisture on covered surfaces. Keep protective coverings in place for the duration of the roofing work.

3.3.1.2. Bitumen Stops: Provide felt bitumen stops or other means to prevent bitumen drippage at roof edges, openings, and vertical projections before hot mopped application of the roofing membrane. Form felt bitumen stops with two 12 inch wide strips of organic ply felt. Laminate with and set strips into a coating of asphalt roof cement with one-half of the width

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November 2011 overhanging the edge of the roof or opening. Where nailers are provided, nail the strips with roofing nails spaced 12 inch on center in addition to embedding in asphalt roof cement. Protect the free portion of each strip from damage throughout the roofing period. After the plies of felt are in place, fold free portion of the strips back over the roofing membrane and embed in a continuous coating of asphalt roof cement. Secure with roofing nails spaced 3 inch on center.

3.3.2. Equipment:

3.3.2.1. Mechanical Application Devices: Provide and maintain mechanical application devices with pneumatic tires that operate without damaging the insulation, roofing membrane, or structural components.

3.3.2.2. Flame-Heated Equipment Do not place flame-heated equipment on roof. Provide and maintain a fire extinguisher adjacent to flame-heated equipment and on the roof.

3.3.2.3. Open Flame Application Equipment Use only open flame equipment recommended by the roofing materials manufacturer. Do not ignite open flame equipment when left unattended. Provide and maintain a fire extinguisher adjacent to open flame equipment on the roof.

3.3.3. Priming of Surfaces: Prime all surfaces to be in contact with adhered membrane materials. Apply primer at the rate of 0.75 gallon per 100 sq. ft. or as recommended by roof membrane manufacturer's printed instructions to promote adhesion of membrane materials. Allow primer to dry prior to application of membrane materials to primed surface. Avoid flammable primer material conditions in torch applied membrane base flashing applications.

3.3.3.1. Priming of Concrete and Masonry Surfaces: After surface dryness requirements have been met, coat concrete and masonry surfaces which are to receive roofing and base flashing uniformly with primer. Allow primer to dry before application of roofing and flashing materials.

3.3.3.2. Priming of Metal Surfaces: Prime flanges of metal components to be embedded into the roofing system prior to setting in bituminous materials or stripping into roofing system.

3.3.4. Covering of Wood Substrate: Cover wood substrate with a layer of unsaturated felt or rosin-sized building paper lapped 2 inch at sides and 4 inch at ends. Nail to hold in place prior to application of roofing system.

3.3.5. Heating of Asphalt: Break up solid asphalt on a surface free of dirt and debris. Heat asphalt in kettle designed to prevent contact of flame with surfaces in contact with the asphalt. Provide visible working thermometer and thermostatic controls set to the temperature limits. Keep controls in working order and calibrated. Use immersion thermometer, accurate within a tolerance of plus or minus 2 degrees F, to check temperatures of the asphalt frequently.

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When temperatures exceed maximum specified, remove asphalt from the site.

Do no permit cutting back, adulterating, or fluxing of asphalt.

3.3.5.1. Temperature Limitations for Asphalt: Heat and apply asphalt at the temperatures specified below unless specified otherwise by manufacturer's printed application instructions. Use thermometer to check temperature during heating and application. Have kettle attended constantly during heating process to ensure specified temperatures are maintained. Do not heat asphalt above its finished blowing temperature (FBT). Do not heat asphalt between 500 and 525 degrees F for longer than four consecutive hours. Do not heat asphalt to the flash point (FP). Apply asphalt and embed membrane sheets when temperature of asphalt is within plus or minus 25 degrees F of the equiviscous temperature (EVT). Before heating and application of asphalt refer to the asphalt manufacturer's label or bill of lading for FP, FBT, and EVT of the asphalt used.

3.4. APPLICATION: Apply roofing materials as specified unless approved otherwise by the Contracting Officer. Keep roofing materials dry before and during application. Except for aggregate surfacing, complete application of roofing in a continuous operation. Begin and apply only as much roofing in one day as can be completed that same day. Maintain specified temperature for asphalt. Do not apply aggregate surfacing until the other roofing application procedures specified herein are completed.

3.4.1. Phased Membrane Construction:

3.4.1.1. Phased application of membrane plies is prohibited.

3.4.1.2. When granule-surfaced modified bitumen cap sheet is specified, any delay in modified bitumen cap sheet installation will result in thorough cleaning of the applied membrane material surface and drying immediately prior to cap sheet installation. Priming of the applied membrane surface may be required at the discretion of the Contracting Officer prior to cap sheet installation.

3.4.2. Temporary Roofing and Flashing: Provide watertight temporary roofing and flashing where considerable work by other trades, such as installing cooling towers, antennas, pipes, ducts, etc, is to be performed on the roof or where construction scheduling or weather conditions require protection of building interior before permanent roofing system can be installed. Do not install temporary roofing over permanently installed insulation. Provide rigid pads for traffic over temporary roofing.

3.4.2.1. Removal: Completely remove temporary roofing and flashing before continuing with application of permanent roofing system.

3.4.3. Base Sheet Application - General: Mechanically adhere or fully adhere base sheets in accordance with membrane manufacturer's printed instructions.

Roll and broom in the base sheet to ensure full contract with the hot asphalt application. On nailable substrates, mechanically fasten base sheet in

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November 2011 conformance with specified wind resistance requirements and membrane manufacturer's printed instructions, and to include increased fastening frequency in corner and perimeter areas. Drive fasteners flush with no dishing or cupping of fastener plate. Where applicable, base sheet may be mechanically fastened in conjunction with insulation to the substrate, in accordance with membrane manufacturers printed instructions. Apply sheets in a continuous operation.

Apply sheets with side laps at a minimum of 2 inch unless greater side lap is recommended by the manufacturer's standard written application instructions.

Provide end laps of not less than 6 inch and staggered a minimum of 36 inch.

Apply sheets at right angles to the roof slope so that the direction of water flow is over and not against the laps. Apply sheets so that plies of sheets extend from eave line on one side of the barrel-type roof and 18 inch over the center line of the crown of the roof. Apply sheets on the other side in the same manner, resulting in twice the normal amount of roofing sheets and asphalt at the crown.

Extend base sheets approximately 4 inch above the top of cant strips at vertical surfaces and to the top of cant strips elsewhere. Trim base sheet to a neat fit around vent pipes, roof drains, and other projections through the roof. Retrofit roof drains must conform to ANSI/SPRI RD-1. Application must be free of ridges, wrinkles, and buckles.

3.4.4. Ply Felts: Ensure proper alignment of felts prior to installation. Apply ply felts shingle fashion perpendicular to slope of roof, including application on areas of tapered insulation that change slope direction. Apply ply felts parallel to slope of roof so that plies of felt extend from eave line on one side of barrel-type roof and 18 inch over center line of the crown of roof. Apply felts on other side in same manner, resulting in twice normal amount of roofing felts and asphalt at crown. Bucking or backwater laps are prohibited. Apply felts in a continuous operation. Provide starter sheets of felt to maintain the specified number of plies throughout the roofing. Apply felts with side laps in accordance with the material manufacturer's printed instructions for the number of plies to be installed and in uniform alignment. Lap ends not less than 6 inch and stagger 36 inch minimum. Place the full width of each ply in hot bitumen immediately behind the bitumen applicator. Plies must be laid free of wrinkles, creases, ridges, or fishmouths. Extend felts approximately 2 inch above top of cant strips at vertical surfaces and to top of cant strips elsewhere. Trim felts to a neat fit around vent pipes, roof drains, and other projections. Avoid traffic on mopped surfaces when the bitumen is fluid and for a minimum of one hour after ply application.

3.4.4.1. Hot-Mopping of Ply Felts: Bond plies to each other and to the base sheets or substrate with hot asphalt. Apply felts immediately following application of asphalt. Do not work ahead with asphalt. At the instant felts come into contact with asphalt, asphalt must be completely fluid, with asphalt temperatures within specified EVT range. Apply asphalt uniformly in a full, continuous mopping and firmly bonding film. Apply asphalt at the rate of approximately 25 pounds per 100 square feet plus or minus 25

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November 2011 percent. Require application rate on the high end of the application range when mopping directly to absorptive insulation substrates of perlite and woodfiber. As felts are rolled into the hot asphalt, immediately squeegee, roll or broom down to eliminate trapped air and to provide tight, smooth laminations without wrinkles, buckles, kinks, or fish mouths. Bitumen must be visible beyond all edges of each ply as it is being installed. Individual ply installation and the completed roof membrane system must be free of air pockets, felt delaminations, ridges, creases, fishmouths, dry laps, or blisters.

Do not lay felts dry or turn back laps for mopping between plies.

3.4.4.2. Backnailing of Ply Felts:

3.4.4.2.1. Backnailing is required generally for slopes of 1 inch or greater for Type III asphalt, 1/2 inch for Type I asphalt at a maximum backnail spacing of 12 inches. On low slope roofs (1/2 inch to 1 inch per foot,) depending on the products used, apply felts shingle fashion, perpendicular to slope, starting at the lowest point. On slopes greater than 1 inch, require backnailing and install nailers of the same thickness as the roof insulation. Run felts parallel to slope and nail through the back edge of the felts into the nailers When roof slope exceeds 2 inch per foot use the applicable paragraphs on backnailing.

3.4.4.2.2. Unless otherwise recommended by the roof membrane

manufacturer and approved by the Contracting Officer,

3.4.5.2.3. For insulated roofs, provide minimum 3-1/2 inch wide nailing strips matching insulation thickness and applied perpendicular to roof slope for backnailing of roof membrane. Space nailing strips, as recommended by the membrane manufacturer, but not exceeding 16 feet on center unless approved otherwise by the Contracting Officer.

Coordinate the nailer installation with insulation requirements. As the felt plies are installed, nail each ply 1 inch from the leading edge at each nailer line.

3.4.5.2.4.