Sprayed polyurethane foam roofing



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SECTION 07 5713
SPRAYED POLYURETHANE FOAM ROOFING
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This master specification section has been prepared by NCFI Polyurethanes for use in the preparation of a project specification section covering EnduraPlus, EnduraMetal, EnduraRock, and EnduraStore roofing, consisting of sprayed polyurethane foam with an elastomeric coating or a protective layer of gravel.
The following should be noted in using this specification:
Hypertext links to specific websites are included after manufacturer names and names of organizations whose standards are referenced within the text, to assist in product selection and further research. Hypertext links are contained in parenthesis and shown in blue, e.g.:
(www.astm.org)
Optional text requiring a selection by the user is enclosed within brackets, e.g.: "Section [09 0000.] [_____.]"
Items requiring user input are enclosed within brackets, e.g.: "Section [_____ - ________]."
Optional paragraphs are separated by an "OR" statement, e.g.:
**** OR ****
For assistance on the use of the products in this section, contact NCFI Polyurethanes by calling 800-346-8229, by email at moreinfo@ncfi.net, or visit their website at www.ncfi.com.


  1. - GENERAL



    1. SUMMARY

Edit the following paragraphs to include only those items specified in this section.




      1. Section Includes:

        1. Sprayed polyurethane insulation.

        2. [Elastomeric topcoat.] [Gravel protective layer.]

Coordinate the following paragraphs with other sections in the project manual.




      1. Related Sections:

        1. Division 01: Administrative, procedural, and temporary work requirements.

        2. Section [03 3000 - Cast-In-Place Concrete:] [__ ____ - ______:] Concrete roof deck to receive roofing.

        3. Section [05 3123 - Steel Roof Decking:] [__ ____ - ______:] Steel roof deck to receive roofing.

        4. Section [06 1100 - Framing and Sheathing:] [__ ____ - ______:] Wood roof deck to receive roofing.

        5. Section [07 0151 - Preparation for Reroofing:] [__ ____ - ______:] [Preparation] [Removal] of existing roofing.




    1. REFERENCES

In the following paragraphs, retain only those reference standards that are used elsewhere in this section.




      1. ASTM International (ASTM) (www.astm.org):

        1. C208 - Standard Specification for Cellulosic Fiber Insulating Board.

        2. C518 - Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus.

        3. D1621 - Standard Test Method for Compressive Properties of Rigid Cellular Plastics.

        4. D1622 - Standard Test Method for Apparent Density of Rigid Cellular Plastics.

        5. D1863 - Standard Specification for Mineral Aggregate Used on Built-Up Roofs.

        6. D6083 - Standard Specification for Liquid Applied Acrylic Coating Used in Roofing.

        7. D6226 - Standard Test Method for Open Cell Content of Rigid Cellular Plastics.

        8. E84 - Standard Test Method for Surface Burning Characteristics of Building Materials.

        9. E108 - Standard Test Methods for Fire Tests of Roof Coverings.




    1. SUBMITTALS

Limiting submittals to only those actually required helps to minimize liability arising from the review of submittals. Minimize submittals on smaller, less complex projects.


Include the following for submission of shop drawings, product data, and samples for the Architect's review.


      1. Submittals for Review:

        1. Product Data: Provide product description, insulation properties, and preparation requirements.

        2. Samples: [6 x 6] [__ x __] coating samples showing available colors, on representative substrate.

Include the following for submission of quality control submittals. These submittals are intended for the Owner's record purposes and are not intended to be reviewed by the Architect.




      1. Quality Control Submittals:

        1. Certificates of Compliance: Certification from an independent testing laboratory that insulation meets fire hazard classification requirements.




    1. QUALITY ASSURANCE

The following paragraph specifies a minimum level of experience required of the parties performing the work of this section. Retain if required, and edit to suit project requirements.




      1. Applicator Qualifications:

        1. Qualified spray polyurethane foam applicator familiar with products being applied.

        2. Minimum [__] years [documented] experience in work of this Section.

        3. Approved by roofing manufacturer.

Include the following for a pre-installation conference attended by the parties performing the work of this section.




      1. Pre-Installation Conference:

        1. Convene [2] [__] weeks prior to commencing work of this Section.

        2. Attendance: Architect, Contractor, roofing applicator, roofing manufacturer's representative, and related trades that may affect roofing installation prior to, during, or following installation.

        3. Review and discuss Contract Documents, roofing system manufacturer's literature, job conditions, scheduling, and other matters affecting application as appropriate.

        4. If possible, tour representative areas of roofing substrates, and discuss substrate construction, related items, work conditions, and materials compatibility.

Include the following for full size mockups for review of construction and coordination of work of several sections.




      1. Mockup:

        1. Provide mockup of roofing at specified thickness.

        2. Size: Minimum [100] [__] square feet.

        3. Demonstrate visual and physical characteristics and application procedures.

        4. Locate [____.] [where directed.]

        5. Approved mockup may remain as part of Work.




    1. DELIVERY, STORAGE AND HANDLING




      1. Store materials at temperatures between 40 and 100 degrees F.

      2. Do not store at high temperatures in direct sunlight.




    1. PROJECT CONDITIONS




      1. Do not apply roofing:

        1. When ambient temperature is below 45 degrees F.

        2. When winds exceed 15 MPH unless windscreens are used.




    1. WARRANTIES

NCFI: Provide length of warranty for following.




      1. Provide manufacturer’s ____ year warranty against defects in materials and installation resulting in water leakage through roofing system.




  1. - PRODUCTS




    1. MANUFACTURERS




      1. Contract Documents are based on products by NCFI Polyurethanes, 800-346-8229, www.ncfi.com.

Edit the following to indicate whether or not substitutions will be permitted for the products in this section.


      1. Substitutions: [Under provisions of Division 01.] [Not permitted.]




    1. MATERIALS




      1. Polyurethane Foam:

        1. Type: Two component, plastic resin and catalyst, cold setting foam using EPA-approved, non-ozone-depleting blowing agent.

        2. Nominal core density: Minimum 2.7 PCF, tested to ASTM D1622.

        3. Fire hazard classification: Maximum flame spread rating of 75, tested to ASTM E84.

        4. Compressive strength parallel to rise: Minimum 40 PSI, tested to ASTM D1621.

NCFI: Provide R-value for following.




        1. R-value: Minimum R-values of ____ for 1 inch thickness, tested to ASTM C518 at 75 degrees F.




      1. Topcoat:

        1. Description: [Acrylic] [Silicone] [Polyurethane] type, resistant to ponding water, free from plasticizers and migrating fire-retardants.

        2. Class A fire rating over foam on noncombustible deck, tested to ASTM E108.

        3. Physical properties; tested to ASTM D6083:

          1. Tensile strength: Minimum 250 PSI at 73 degrees F.

          2. Elongation at break: Minimum 250 percent at 73 degrees F.

          3. Wet adhesion to substrate: Minimum 3.0 pounds per linear inch.

          4. Moisture vapor permeance: Maximum 20 perms.

          5. Solids content: Minimum 50 percent by volume; minimum 65 percent by weight.




    1. ACCESSORIES




      1. Flashings, Primers. Tapes, Adhesives, Thinners, Sealants, and Other Components: Approved by roofing system manufacturer.

Include the following 2 paragraphs when a protective course is required over existing roofing systems; edit to suit project requirements.


      1. Underlayment Board: ASTM C208, high-density rigid cellulose fiber, [1/2] [__] inch thick.

      2. Underlayment Attachment: [NCFI Polyurethanes Spray Adhesive 13-003.] [OMG Roof Insulation Fasteners No. 12-11 or equivalent with 3 inch diameter galvanized steel disks.]

Include the following for EnduraRock systems with gravel protective course; edit to suit project requirements.


      1. Gravel: ASTM D1863, washed gravel, Size No. 6 - 3/4 to 3/8 inch, [tan] [____] color.

Include the following for metal decks.


      1. Mesh: Asphalt-treated glass fiber type, 20 x 10 count; Hilco by EL Hilts and Co. or equivalent.

Include the following for traffic mats.


      1. Traffic Mats: Open mesh type; Wearwell by Tennessee Mat co. or equivalent.




  1. - EXECUTION




    1. INSPECTION




      1. Verify that:

        1. Surfaces to receive roofing are dry, smooth, and sound.

        2. Roof penetrations are completed and secure.

        3. Roof drains are connected and free from obstructions.

        4. Air conditioning and intake vents are closed or protected.

        5. Roof slope does not exceed 3/8 inch per foot.

Include the following for new concrete decks.




        1. Concrete substrate has cured minimum 28 days.




    1. PREPARATION - GENERAL




      1. Clean surfaces to receive roofing; remove dirt, dust, contaminants, and debris.

      2. Prime surfaces when required by roofing manufacturer.

      3. Protect adjacent and underlying surfaces from accidental application.




    1. PREPARATION - EXISTING BUILT-UP ROOFING




      1. Remove loose gravel by brooming, power sweeping, or vacuuming.

      2. Mechanically fasten loose seams and openings.

      3. Split blisters and mechanically fasten.

      4. Repair or replace loose, damaged, and deteriorated flashings.




    1. PREPARATION - EXISTING SINGLE PLY ROOFING




      1. Remove or securely fasten loose-laid membranes.

      2. Mechanically fasten loose seams and openings.

      3. Tighten loose fasteners; replace missing fasteners.

      4. Repair or replace loose, damaged, and deteriorated flashings.

      5. Clean and seal seams and end laps with butyl tape.

      6. Patch cuts and tears in membrane with new membrane.




    1. PREPARATION - EXISTING METAL DECKS

Select one of the following 3 methods.




      1. Secure underlayment board to deck with [full adhesive bed.] [fasteners spaced at rate of 11 fasteners per 4 x 8 foot board.]

**** OR ****

      1. Fill flutes with sprayed insulation, flush with top of deck flutes. Avoid spraying insulation onto top of deck flutes.

      2. Remove insulation applied higher than top of deck flutes.

**** OR ****

      1. Apply mesh across deck surface, spanning deck flutes. Stretch taut and secure with small amounts of sprayed insulation.

      2. Apply sprayed insulation to completely cover mesh surface.




    1. PREPARATION - EXISTING METAL ROOFING




      1. Spot prime rusted metal.

      2. Replace metal corroded to point of weakening or breaking. Clean and spot prime new metal.

      3. Tighten loose fasteners; replace missing fasteners. Seal joints and seams with butyl tape.

      4. Seal areas unable to be sealed with butyl tape with trowel grade sealer; allow to dry 24 hours minimum.

        1. Apply sprayed insulation and immediately embed mesh into wet insulation; lap edges 2 inches minimum.

        2. Apply second coat of sprayed insulation, completely embedding mesh.

        3. Allow to dry minimum 6 hours before applying additional insulation.




    1. PREPARATION - EXISTING SPRAYED FOAM ROOFING




      1. Scarify existing sprayed foam down to adhered foam. Allow foam to dry, then apply primer.

      2. Wire brush degraded surfaces.

      3. Fill cracks, holes, and imperfections with joint sealer.




    1. APPLICATION OF INSULATION




      1. Apply foam insulation in accordance with manufacturer's instructions.

Foam thickness should be minimum 1.5 inches when applied over existing built-up and sprayed foam roofing, and minimum 2 inches for new construction and tear-offs.


      1. Apply foam in minimum 1/2 inch lifts to [minimum 1 inch thickness.] [minimum [__] inch thickness.] [thickness required to achieve an average thermal resistance R value of [__].]

      2. Fill low spots to prevent water ponding.

      3. Extend foam minimum 2 inches up vertical intersections, fillet insulation and feather out. Form a cant of foam at perpendicular interruptions.

      4. Slope foam to drain at minimum [1/8] [1/4] inch per foot.

      5. Surface Flatness: 1/4 inch per 10 foot measured with straight edge.

      6. Apply foam to permit [first coat of] overcoat application [on same day.] [within 24 hours.] If this time limit is exceeded, prepare foam skin surface in accordance with manufacturer's instructions.

      7. Develop finish skin surface to smooth and unbroken rough orange peel texture free from voids, pinholes, and crevices.

      8. Seal flashings and flanges of items penetrating membrane.




    1. APPLICATION OF TOPCOAT




      1. Apply topcoat in accordance with manufacturer's instructions.

      2. Apply topcoat same day insulation is applied. Allow insulation to cure minimum 2 hours before applying topcoat.

      3. Spray or roller apply topcoat in crosshatch pattern.

      4. Apply in three coats to minimum dry film thickness of 30 mils. Allow each coat to dry before applying subsequent coats.

      5. Extend overcoat to cover foam insulation and extend 2 inches above foam termination on protrusions, to self terminating, water tight seal.

Include the following for gravel protective layer.




    1. APPLICATION OF GRAVEL




      1. Apply gravel uniformly over surface to minimum 1 inch depth.

      2. Rake surfaces smooth.

      3. Install traffic mats on top of gravel at top and bottom of roof ladders, at doors, and at access hatches.




    1. CLEANING




      1. Remove excess insulation and topcoat from adjacent surfaces.




    1. PROTECTION




      1. Ensure roof surface is free of traffic for minimum 3 days after topcoat application.




    1. ADJUSTING




      1. Patch damaged areas by scarifying, priming, and applying topcoat.

      2. Check completed roofs for ponding water. If present cut drainage channels using rotary wire brush, then reapply topcoat.

END OF SECTION


NCFI Polyurethanes 07 5713- Sprayed Polyurethane Foam Roofing



Draft for Review - 03/27/09


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