1-2 SPECS 07550.doc

IDC Base Roof Repair

DIVISION 7 - THERMAL & MOISTURE PROTECTION

SECTION 07220 - INSULATION FOR ROOFING

PART 1 - GENERAL

1.01 APPLICABLE PUBLICATIONS: 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.

A. Federal Specifications (Fed Spec):

FF-N-105B

Nails, Brads, Staples and Spikes: Wire, & Am-3 & Int Am-4

Cut and Wrought

HH-I-521F

Insulation Blankets

HH-I-1972/2

Insulation Board, Thermal, Polyurethane or

Polyisocyanurate Faced with Asphalt/Organic Felt, Polymer/Organic Mat, Asphalt/Glass Mat or

Polymer/Glass Fiber Felt on Both Sides of the Foam

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 the Other Side of the Foam

B. American Society for Testing and Materials (ASTM) Publications:

C 208-72

Insulating Board (Cellulosic Fiber), Structural and

(R 1982)

Decorative

C 552-79

Cellular Glass Block and Pipe Thermal Insulation

C 665-86

Mineral Fiber Blanket, Thermal Insulation for

Light Frame Construction

C 726-81

Mineral Fiber and Mineral Fiber, Rigid Cellular

Polyurethane Composite Roof Insulation Board

C 728-82

Perlite Thermal Insulation Board and tapered

D 41-85

Asphalt Primer Used in Roofing, Dampproofing, and

Waterproofing

D 226-82

Asphalt-Saturated Organic Felt Used in Roofing and

Waterproofing

D 312-84

Asphalt Used in Roofing

D 2178-85a

Asphalt Glass Felt Used in Roofing and Waterproofing

D 2626-81

Asphalt-Saturated and Coated Organic Felt Base Sheet

Used in Roofing

D 2822-75

Asphalt Roof Cement

(R 1982)

D 3672-84

Venting Asphalt-Saturated and Coated Inorganic Felt

Base Sheet Used in Roofing

C. American Society of Heating, Refrigeration and Air-Conditioning Engineers, Inc. (ASHRAE) Publications:

Handbook Fundamentals (1985 and Errata)

D. Factory Mutual Systems (FM) Publications:

Approval Guide (1985)

Loss Prevention Data Sheet I-28 Insulated Steel Deck (May 1983)

1.02 SUBMITTALS:

A. Certificates of Compliance: Certificates of Compliance shall be submitted for insulation and felt materials in accordance with the SPECIAL CLAUSES.

B. Bills of Lading: Asphalt flash point and equiviscous temperature (EVT) shall be indicated on bills of lading or on individual containers.

C. Manufacturer’s Recommendations: Insulation manufacturer’s recommendations shall be submitted for the installation of insulation.

D. Contractor’s Quality Control (CQC) Procedure: The CQC procedure for insulation installation shall be submitted for approval prior to start of roof insulation work.

1.03 STORAGE OF MATERIALS: Insulation and felts shall be kept dry at all times, before, during, or after delivery to the site and shall be stored in an enclosed building or in a closed trailer. Felts shall be stacked on end one level high. Felt rolls shall be maintained at a temperature above 50 degrees F for 24 hours immediately before laying.

1.04 COORDINATION REQUIREMENTS:

A. Fire Approval: Insulation shall be fire approved for application in Class I steel deck construction by the FM Approval Guide except for installation on poured concrete decks or precast concrete roof deck panels.

B. Roofing: Insulation shall be applied so that all roof insulation applied each day is waterproofed the same day. Phased construction will not be permitted.

1.05 ENVIRONMENTAL CONDITIONS: Air temperature shall be above 40 degrees F and there shall be no visible ice, frost, or moisture on the roof deck when the insulation and roofing are installed.

PART 2 - PRODUCTS

2.01 BITUMINOUS MATERIALS: Bituminous materials shall conform to the following requirements:

A. Asphalt Bitumen: ASTM D 312, Type III or IV.

B. Asphalt Cement: ASTM D 2822, Type I.

C. Asphalt Primer: ASTM D 41.

2.02 INSULATION: Insulation shall be one of the following materials:

A. Composite Board Insulation: Fed. Spec. HH-I-1972/GEN or HH-I-1972/3.

B. Expanded-Perlite Insulation Board: ASTM C 728.

C. Fiberboard: ASTM C 208, roof insulating board, treated with sizing, wax or bituminous impregnation. Bituminous impregnation shall be limited to 4 percent by weight when used over steel decks.

D. Mineral-Fiber Insulation Board: ASTM C 726.

E. Phenolic Insulation: Phenolic insulation shall be closed cell phenolic foam board with density in excess of 2.5 pounds per cubic foot. The top and bottom surfaces shall be covered with an uncoated glass facer bonded to the phenolic foam during manufacture. Phenolic insulation shall meet physical requirements of HH-I-1972/Gen.

F. Polyurethane: Fed. Spec. HH-I-1972/Gen and HH-I-1972/2, Class 3 or Class 4.

G. BATT Insulation: Fed. Spec. HH-I-521F and ASTM C665, Type I.

2.03 NAILS AND FASTENERS: Nails and fasteners shall conform to the following requirements:

A. Nails for Fastening Insulation to Flush Mounted Wood Nailer: Fed. Spec. FF-N-105, Type II, Style 20, of sufficient length to hold insulation securely in place.

B. Fasteners Designed to Secure Insulation to Steel Decks: Underwriters Laboratories, Inc., or Factory Mutual Research Corporation for the specific insulation installed.

C. Fasteners Designed to Secure Insulation to Gypsum or Insulating Concrete Decks: Insulation manufacturer’s recommendations with minimum holding power when driven at 40 pounds per fastener.

D. Metal Disks: Flat and not less than 30 gage thickness. Disks used with nails or fasteners for securing fiberboard insulation shall be minimum 1-inch diameter. Disks used with nails or fasteners for securing other board insulation shall be minimum 2-1/8 inch diameter.

2.04 VENTING INORGANIC BASE SHEET: ASTM D 3672, Type II, Unperforated, with spot mopping holes where specified.

2.05 GLASS ROOFING FELT: ASTM D 2178, Type IV.

2.06 ORGANIC ROOFING FELT: ASTM D 226, Type I.

2.07 WOOD NAILERS: Wood nailers shall conform to SECTION: ROUGH CARPENTRY and the following additional requirements:

A. Edge Nailers: Continuous wood edge nailers shall be installed as indicated at eaves, rakes, and elsewhere when insulation is applied on the roof deck. Nailers shall be not less than nominal 6 inches wide and of thickness to finish flush with the top surface of the insulation. For built-up roofing and fully adhered membrane, the bottom half of the nailer shall be groove-cut or have scab pieces of lumber secured to the bottom, to provide a net open area equivalent to 10 percent of the edge face for ventilation of the insulation.

B. Surface Mounted Wood Nailers: Where insulation is installed on roof slopes greater than 1/2 inch per foot, nailers shall be a nominal 3 inches wide by the full thickness of the insulation.

2.08 WOOD VENTS FOR PARAPET WALLS: Wood vents for parapet walls shall be 1 inch nominal thickness, treated as specified for wood nailers. Wall side of vent shall be groove-cut to provide a net open area equivalent to 20 percent of the thickness edge for venting insulation.

PART 3 - EXECUTION

3.01 PREPARATION REQUIREMENTS:

A. Substrate: The substrate construction of any bay or section of the building shall be completed before insulation or vapor retarder work is begun thereon. Vents and other items penetrating the roof shall be secured in position and properly prepared for flashing. Nailers, curbs and other items attached to roof surface shall be in place before insulation or vapor retarder work is begun. Substrate surface shall be smooth and dry.

B. Preparation: Prior to application of vapor retarder or insulation, joints shall be covered with a 4-inch strip of roofing felt, embedded in and coated with asphalt cement. Concrete surfaces to receive asphalt shall be coated with primer at a rate of not less than 1 gallon per square and allowed to dry.

C. Asphalt: Asphalt shall not be heated higher than 75 degrees F above the EVT or 50 degrees F below the flash point, whichever is lower. EVT and flash point temperatures of asphalt in the kettle shall be conspicuously posted on the kettle. Kettle shall be provided with automatic thermostatic controls and an accurate thermometer. Kettle operators shall be in attendance at all times during heating to insure that the maximum temperature is not exceeded. Asphalt shall be applied within a range 25 degrees F below to 25 degrees F above the EVT or as specified by the manufacturer. Application temperature shall be measured at the mop bucket or mechanical applicator. Asphalt at a temperature below this range shall be returned to the kettle. Flame-heated equipment shall not be placed on the roof.

D. Insulation: Except when used as the upper layer of composite board insulation, or when the first layer of insulation is mineral fiber, polyurethane shall not be used over steel decks. Composite board shall be laid with polyurethane side up except the top layer which shall be laid with polyurethane side down. Insulation work shall be coordinated with roofing and sheet metalwork so that all material applied each day is waterproofed the same day with the complete roofing system and sheet metal flashings. Uninsulated steel decks shall have insulation applied as an underlayment to span the steel deck flutes.

3.02 APPLICATION OF INSULATION:

A. General Requirements:

1. On slopes of 1 inch per foot or more, provide pressure treated wood insulation stops according to the roof insulation manufacturer’s requirements.

2. Secure cant and tapered edge strips in place with asphalt; cut and neatly fit all joints and miters. Cant strip may be tacked in place for ease of installation (approximately 3 nails every 4 feet).

3. Insulation board, cant strips and tapered edge strips that can be readily lifted or displaced by hand are not adequately secured. Reinstall all lifted and displaced items that are not damaged. Replace damaged items with new material.

4. Follow additional applicable requirements of the roof insulation manufacturer and BURS manufacturer.

B. Over Steel, Wood and Gypsum Decks:

1. First (bottom) layer. Place insulation so that side joints between boards are fully supported at all times. Stagger end joints by a minimum of 6 inches; bring boards into moderate, uniform contact. Also, secure all insulation boards (including the first and second layer) with mechanical fasteners over the entire roof deck according to FM Loss Prevention Data Sheet 1-28. Filler pieces must have at least two fasteners. Locate all fasteners such that there is at least 1 fastener every 2 square feet, or comply with FM Windstorm Class FM I-90, whichever is more stringent. Use those driving methods prescribed by the fastener manufacturer.

2. Second (top) layers. Secure to first layer by a full continuous mopping of hot, fluid bitumen; stagger end joints by minimum six (6) inches; bring boards into moderate, uniform contact at sides and ends while the bitumen is hot and fluid. Offset all joints between layers by maximum dimensions in both directions. In lieu of mopping, the second layer shall be fastened to the roof deck so that the insulation will comply with FM Windstorm Class FM I-90.

C. Over Non-Nailable Decks with Underlayments:

1. Secure all insulation boards in full and continuous moppings of hot fluid bitumen.

2. Stagger end joints by minimum 6 inches. Bring boards into moderate, uniform contact at sides and ends while the bitumen is hot and fluid. Offset all joints between layers by maximum dimensions in both directions.

D. Protection Requirements: The insulation shall be kept dry at all times. Insulation boards shall not be kicked into position. Exposed edges of the insulation shall be protected by cutoffs at the end of each work day or whenever precipitation is imminent. Cutoffs shall be two layers of bituminous-saturated felt set in plastic bituminous cement. Cutoffs shall be removed when work is resumed. Open spaces between insulation and parapets or other walls and space at curbs, scuttles, and expansion joints, shall be protected until permanent roofing and flashing is applied. Storing, walking, wheeling, or trucking directly on insulation or on roofed surfaces will not be permitted. Smooth, clean board or plank walkways, runways, and platforms shall be permitted near supports, as necessary, to distribute weight to conform to indicated live load limits of roof construction.

3.03 CONTRACTOR QUALITY CONTROL: The Contractor shall establish and maintain a quality control procedure to assure compliance of the installed roof insulation with the contract requirements. Any work found not to be in compliance with the contract shall be promptly removed and replaced or corrected in an approved manner. Quality control shall include, but not be limited to, the following:

A. Observation of environmental conditions; number and skill level of insulation workers; start and end time of work.

B. Verification of certification, listing or label compliance with FM Approval Guide.

C. Verification of proper storage and handling of insulation and vapor retarder materials before, during, and after installation.

D. Inspection of vapor retarder application, including edge envelopes and mechanical fastening.

E. Coordination with other materials, cants, sleepers, and nailing strips.

F. Inspection of insulation joint orientation and laps between layers, joint width and bearing of edges of insulation on deck.

G. Installation of cutoffs and proper joining of work on subsequent days.

H. Continuation of complete roofing system installation to cover insulation installed same day.

Refer to work item 8 of Quality Control procedures on built-up roofing section for additional information.

END OF SECTION

SECTION 07220 PAGE 1