07220 Roof and Deck Insulation Attch 1.pdf

MS0610

FA4417-10-R-0012 Amendment 2 Attachment 1

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SECTION 07220: ROOF AND DECK INSULATION

PART 1 GENERAL

1.01 RELATED SPECIFICATION SECTIONS:

A. Section 01000 – GENERAL REQUIREMENTS

1.02 REFERENCES

A. The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only.

1. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)

a. ASTM C 984: (1984) Perlite Board and Rigid Cellular Polyurethane Composite Roof Insulation

b. ASTM D 41: (1994) Asphalt Primer Used in Roofing, Dampproofing, and Waterproofing

c. ASTM D 312: (1995) Asphalt Used in Roofing

d. ASTM D 4586: (1993) Asphalt Roof Cement, Asbestos-Free

e. ASTM E 84: (1995; Rev. A) Surface Burning Characteristics of Building Materials

2. FEDERAL SPECIFICATIONS (FS)

a. FS HH-I-1972/1: Insulation Board, Thermal, Polyurethane or Polyisocyanurate, Faced with

Aluminum Foil on Both Sides of the Foam

b. FS HH-I-1972/2: Insulation Board, Thermal, Polyurethane or Polyisocyanurate Faced with

Asphalt/Organic Felt, Polymer/Organic Mat, Asphalt/Glass Mat or Polymer/Glass Mat on Both Sides of the Foam.

c. FS HH-I-1972/3 Insulation Board, Thermal, Polyurethane or Polyisocyanurate Faced with Perlite Insulation Board on One Side and Asphalt/Organic Felt or Asphalt/Glass Fiber Felt on Other Side of the Foam

3. UNDERWRITERS LABORATORIES INC. (UL)

a. UL BMD: (1995) Building Materials Directory

1.03 SUBMITTALS

A. Submit the following in accordance with section entitled "Submittal Procedures."

1. Manufacturer's Catalog Data

a. Fasteners

b. Insulation

2. Drawings

a. Tapered roof insulation system: Show a complete description of the procedures for the installation of each phase of the system indicating the type of materials, thicknesses, identity codes, sequence of laying insulation, location of ridges and valleys, special methods for cutting and fitting of insulation, and special precautions. The drawings shall be based on field measurements.

3. Instructions

a. Nails and fasteners

b. Roof insulation, including field of roof and perimeter attachment requirements.

4. Statements

a. Installer qualifications

1) Requirement: Submit certificate from the insulation manufacturer attesting that the installer has the proper qualifications for installing tapered roof insulation systems.

5. Test Reports

a. Flame spread and smoke developed ratings: Submit in accordance with ASTM E 84.

1.04 QUALITY ASSURANCE

A. Insulation on Decks: Roof insulation shall have a flame spread rating not greater than 75 and a smoke developed rating not greater than 150, exclusive of covering, when tested in accordance with ASTM E 84.

Insulation bearing the UL label and listed in the UL BMD as meeting the flame spread and smoke developed ratings will be accepted in lieu of copies of test reports.

1.05 DELIVERY, STORAGE, AND HANDLING

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A. Delivery: Deliver materials to site in manufacturer's unopened and undamaged standard commercial containers bearing the following legible information:

1. Name of manufacturer;

2. Brand designation;

3. Specification number, type, and class, as applicable, where materials are covered by a referenced specification; and

4. Asphalt's flashpoint (FP), equiviscous temperature (EVT), and finished blowing temperature (FBT).

5. Deliver materials in sufficient quantity to allow continuity of the work.

B. Storage and Handling: Store and handle materials in a manner to protect from damage, exposure to open flame or other ignition sources, and from wetting, condensation or moisture absorption. Mark and remove damaged, crushed, or wet materials from the project site. Store in an enclosed building or trailer that provides a dry, adequately ventilated environment. Store felt rolls on ends. For the 24 hours immediately before application of felts, store felts in an area maintained at a temperature no lower than 50 degrees F.

Replace damaged material with new material.

1.06 ENVIRONMENTAL CONDITIONS

A. Do not install roof insulation during inclement weather or when air temperature is below 40 degrees F or when there is ice, frost, or moisture visible on the roof deck.

1.07 PROTECTION OF PROPERTY

A. Provide protection as specified.

1. Flame-Heated Equipment: Locate and use flame-heated equipment so as not to endanger the structure or other materials on the site or adjacent property. Do not place flame-heated equipment on the roof. Provide and maintain a fire extinguisher near each item of flame-heated equipment.

2. Protective Coverings: Install protective coverings at paving and building walls adjacent to hoist and kettles prior to starting the work. Lap protective coverings at least 6 inches, secure them against wind, and vent them to prevent collection of moisture on the covered surfaces. Keep protective coverings in place for the duration of the work with asphalt products.

3. Special Protection: Provide special protection approved by the insulation manufacturer, or avoid heavy traffic on completed work when ambient temperature is above 80 degrees F.

4. Drippage of Bitumen: Seal joints in and at edges of deck as necessary to prevent drippage of asphalt into building or down exterior walls.

PART 2 PRODUCTS

2.01 INSULATION

A. Insulation Types: Roof insulation shall be the following materials and compatible with attachment methods for the specified insulation and roof membrane:

1. Polyisocyanurate Board: FS HH-I-1972/2 (Felt-faced) or FS HH-I-1972/1 (Foil-faced), except minimum compressive strength shall be 20 pounds per square inch (psi).

2. Composite Boards: FS HH-I-1972/3 (Polyisocyanurate-perlite), Style 1 or 2; FS HH-I-1972/5

(Polyisocyanurate-perlite); ASTM C 984 (Polyisocyanurate-Perlite).

B. Insulation Thickness:

1. Air-conditioned buildings. As necessary to provide a thermal resistance (R value) of 30 or more for average thickness of tapered system. Thickness shall be based on the "R" value for aged insulation.

2. Non-airconditioned buildings. As necessary to provide a thermal resistance (R value) of 12 or more for average thickness of tapered system. Thickness shall be based on the "R" value for aged insulation.

C. Tapered Roof Insulation: One layer of the tapered roof insulation assembly shall be factory tapered to a slope of not less than 1/4 inch per foot. Provide starter and filler blocks as required providing the total thickness of insulation necessary to meet the specified slope and thermal conductance. Mitered joints shall be factory fabricated and shall consist of two diagonally cut boards or one board shaped to provide the required slopes. Identify each piece of tapered insulation board by color or other identity coding system, allowing the identification of different sizes of tapered insulation board required to complete the roof insulation system.

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D. Cants and Tapered Edge Strips: Provide preformed cants and tapered edge strips of the same material as the roof insulation; or, when roof insulation material is unavailable, provide pressure-preservative treated wood, wood fiberboard, or rigid Perlite board cants and edge strips as recommended by the roofing manufacturer, unless otherwise indicated. Face of cant strips shall have incline of 45 degrees and vertical height of 4 inches. Taper edge strips at a rate of 3/4 to 1 1/2 inch per foot down to approximately 1/8 inch thick.

2.02 BITUMENS

A. Asphalt Primer: ASTM D 41.

B. Asphalt: ASTM D 312, Type III or IV.

C. Asphalt Roof Cement: ASTM D 4586, Type I for horizontal surfaces, Type II for vertical and sloped surfaces.

2.03 FASTENERS

A. Flush-driven through flat round or hexagonal steel or plastic plates. Steel plates shall be zinc-coated, flat round not less than 1-3/8 inch diameter or hexagonal not less than 28 gage. Plastic plates shall be high-density, molded thermoplastic with smooth top surface, reinforcing ribs and not less than 3 inches in diameter. Fastener head shall recess fully into the plastic plate after it is driven. Plates shall be formed to prevent dishing. Do not use bell-or cup-shaped plates. Minimum withdrawal resistance of fasteners from deck shall be 40 pounds (lbs) each.

2.04 WOOD NAILERS AND BLOCKING

A. Pressure-preservative-treated.

PART 3 EXECUTION

3.01 EXAMINATION AND PREPARATION

A. Surface Inspection: Surfaces shall be clean, smooth, and dry. Check roof deck surfaces, including surfaces sloped to roof drains and outlets, for defects before starting work. The Contractor shall inspect and approve the surfaces immediately before starting installation. Prior to installing insulation, perform the following:

1. In the presence of the Contracting Officer perform the following surface-dryness test on concrete substrates:

a. Foaming: When poured on the deck, one pint of asphalt when heated in the range of 350 to 400 degrees F, shall not foam upon contact

b. Strippability: After asphalt used in the foaming test application has cooled to ambient temperatures, test coating for adherence. Should a portion of the sample be readily stripped clean from surface, do not consider surface to be dry and do not start application. Should rain occur during application, stop work and do not resume until surface has been tested by method above and found dry.

B. Surface Preparation: Correct defects and inaccuracies in roof deck surface to eliminate poor drainage and hollow or low spots and perform the following:

1. Install wood nailers the same thickness as insulation at eaves, edges, curbs, walls, and roof openings for securing cant strips, gravel stops, and flashing flanges.

3.02 INSULATION INSTALLATION

A. Apply insulation in two layers with staggered joints when total required thickness of insulation exceeds 1/2 inch. Lay insulation so that continuous longitudinal joints are perpendicular to direction of felts for the built-up roofing and end joints of each course are staggered with those of adjoining courses. When using multiple layers of insulation, joints of each succeeding layer shall be parallel and offset in both directions with respect to layer below. Keep insulation 1/2 inch clear of vertical surfaces penetrating and projecting from roof surface.

1. Installation Using Asphalt: Firmly embed each layer in solid asphalt mopping; mop only sufficient area to provide complete embedment of one board at a time. Provide 20 to 35 lbs of asphalt per 100 square feet of roof deck for each layer of insulation. Apply asphalt when temperature is within plus or minus 25 degrees F of EVT. Do not heat asphalt above asphalt's FBT or 525 degrees F, whichever is

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2. Installation Using Only Mechanical Fasteners; Secure total thickness of insulation with penetrating type fasteners.

3. Special Precautions for Installation of Foam Insulation

a. Polyisocyanurate Insulation: Where Polyisocyanurate foam board insulation is provided, install

3/4 inch thick expanded Perlite board insulation over top surface of foam board insulation.

Stagger joints of insulation with respect to foam board insulation below.

4. Cant Strips: Where indicated, provide cant strips at intersections of roof with walls, parapets, and curbs extending above roof. Wood cant strips shall bear on and be anchored to wood blocking. Fit cant strips flush against vertical surfaces. Where possible, nail cant strips to adjoining surfaces.

Where cant strips are installed against non-nailable materials, install in heavy mopping of asphalt or set in a heavy coating of asphalt roof cement.

5. Tapered Edge Strips: Where indicated, provide edge strips in the right angle formed by junction of roof and wood nailing strips that extend above level of roof. Install edge strips flush against vertical surfaces of wood nailing strips. Where possible, nail edge strips to adjoining surfaces. Where installed against non-nailable materials, install in heavy mopping of asphalt or set in heavy coating of asphalt roof cement.

3.03 PROTECTION

A. Protection of Applied Insulation: Completely cover each day's installation of insulation with the finished roofing specified on same day. Do not permit phased construction. Protect open ends of each day's work with temporary water cutoffs, and remove when work is resumed. Protect open spaces between insulation and parapets or other walls and spaces at curbs, scuttles, and expansion joints, until permanent roofing and flashing are applied. Do not permit storing, walking, wheeling, or trucking directly on insulation or on roofed surfaces. Provide smooth, clean board or plank walkways, runways, and platforms near supports, as necessary, to distribute weight to conform to a 20-psf live load limit.

B. Damaged Work and Materials: Restore work and materials that become damaged during construction to original condition or replace with new materials.

END OF SECTION