SPRAY FOAM

Best option for coating new foam or to re-coat an existing acrylic- or silicone-coated spray foam roof. California VOC-compliant.

I. General

1.01 Summary

  1. This document outlines the installation process of Lexis roof coatings on spray foam roofs. Actual installation requirements may vary and it is the installer's or specifier's responsibility to determine actual project requirements.
  2. This specification may not outline all procedures for preparation and finishing of penetrations, drains, flashings, etc. This work should be outlined separately by the contractor before the work commences and shall be performed observing good trade practices.
  3. All technical data and safety data sheets for each product used are considered part of these specifications.

1.02 Quality Assurance

  1. Project must be pre-approved by Lexis Coatings to be eligible for any warranty.
  2. Installer must be approved by Lexis Coatings and have experience on projects of similar scope and complexity.
  3. Obtain written approval from Lexis Coatings for any deviation in this specification.

1.03 Warranty

  1. Manufacturer's Warranty: Lexis warrants that the supplied material meets or exceeds our published specifications. Manufacturer's standard material warranty document is only issued on pre-approved projects.
  2. Comply with manufacturer's warranty application procedures. A Pre-Job Qualification Form should be submitted and approved prior to job commencement.
  3. Installer's Warranty: All labor warranties should be provided by installer unless additional warranty coverage is requested, approved and purchased for the project.
  4. Warranty Period: 5, 10 and 15 years.

II. Products

2.01 Lexis Spray Foam Roof Restoration System

The following spray foam roof coating products are available from Lexis Coatings:

EnergyGuard Silicone Roof Coating
Clean Up: VM&P Naphtha, Mineral Spirits
Elongation: 318% initial
Tensile Strength: 500 psi
Solids by Volume: 67%
EnergyMax Silicone Roof Coating
Clean Up: VM&P Naphtha, Mineral Spirits
Elongation: 249% ± 50
Tensile Strength: 325 psi ± 50
Solids by Volume: 96% ±2
SeamStitch Fibers
Clean Up: Broom or Suction Cleaner
Elongation: 249% ± 50
Tensile Strength: 325 psi ± 50
Solids by Volume: 96% ±2
SeamStitch Fillers
Color: Light Gray
Clean Up: Broom or Suction Cleaner
Elongation: 249% ± 50
Tensile Strength: 325 psi ± 50
Solids by Volume: 96% ±2

2.02 Product Substitutions

2.03 Related Materials

  1. Roof accessories, flashing, seam tapes and similar materials shall be approved by the roof system manufacturer. All materials used shall be applied in accordance with its manufacturer's recommendations.

2.04 Delivery, Storage and Handling

  1. Delivery: Materials should arrive at the site in manufacturer's original, unopened, undamaged containers with identification labels intact.
  2. Storage: Store all materials at temperatures between 55°F - 90°F (12.7°C - 32.2°C) with careful handling to prevent damage. Do not store at high temperatures in direct sunlight. Protect from exposure to harmful environmental conditions.
  3. Protection: Protect all materials from freezing and other damage during transit, handling, storage and installation.

2.05 Equipment

  1. Read product data sheets for recommended application equipment or consult the equipment manufacturer directly.

III. Execution

3.01 Project and Site Conditions

  1. Substrate should be structurally sound.
  2. Product coverage rates may vary due to application method, surface texture, substrate absorption, wind conditions while spraying and/or other variables.
  3. A moisture survey or other assessments may be needed to determine the presence of wet insulation under existing roofing material.
  4. No application of materials are permitted if inclement weather, precipitation, freezing temperatures are expected within 24 hours or if the following conditions are present:
  Water-Based Solvent-Based
Ambient Air Temperature <55°F (10°C) or >100°F (37.8°C) <45°F (7.2°C) or >95°F (35.0°C)
Substrate Temperature <45°F (7.2°C) or >130°F (54.4°C) <35°F (1.6°C) or >120°F (48.8°C)
Humidity: >85% (high humidity will extend dry time.) > 85% (low humidity may retard cure time.)

3.02 Examination

  1. Verify conditions are acceptable for application of spray foam roof restoration system.
  2. Inspect spray foam roof to receive roof coating and make sure they are clean, sound, properly prepared and free of moisture, dirt, debris or other contaminants.
  3. A comprehensive moisture survey is to be conducted to locate and identify areas of trapped moisture and saturated foam.
  4. Verify that all on-roof items, penetrations, mechanical equipment, HVAC drains are in place and secure. All air conditioning and air intake vents should be suitably protected or closed.
  5. Verify that areas within the vicinity of the application area as protected from overspray.
  6. Verify that all roof drains, gutters, downspouts, catch basins are clean and in working order.

3.03 Preparation

  1. Cleaning: The entire spray foam roof surface must be clean, sound, dry and free of any contaminants that would interfere with the proper adhesion of the roof coating. This may require pressure washing, scraping, wire brushing or other means necessary while observing responsible trade practices. All loose paint and oxidation should be removed before applying any product.
  2. Ponding Water: Contractor shall make every effort to mechanically eliminate all ponding water areas on the spray foam roof prior to application of any roof coating product.
  3. Small Blisters and Cracks: Cut out bad areas to expose good foam. Mix EnergyMax Silicone Coating with SeamStitch Fibers or SeamStitch Fillers until you achieve a putty like consistency. Use a putty knife to fill these small areas.
  4. Large Blisters and Weathered Areas: Blistered, damaged and weathered SPF must be removed down to good foam or bare substrate. Apply new SPF to fill repair areas. Overfilled areas may be sanded down to make it flush with the rest of the surface. Prime surface immediately to protect from UV-degradation.
  5. Do not apply coatings until all unsatisfactory conditions have been corrected in a manner acceptable to the original spray foam roofing manufacturer.

3.04 Application

  1. Inspect spray foam roof to receive roof coating. Always perform a coating adhesion test before doing the entire job.
  2. Primer: Primer is not required over new foam. PrimeLock Epoxy Primer may be used to protect the surface from UV-degradation if conditions does not allow the application of base coat to the exposed foam.
  3. Base Coat: Apply EnergyGuard Silicone Coating or EnergyMax Silicone Coating using the application rates specified below. Allow to dry thoroughly for 8 - 12 hours depending on humidity and temperature.
  4. Top Coat: Apply EnergyGuard Silicone Coating or EnergyMax Silicone Coating using the application rates specified below. Allow to dry and cure before exposing to foot traffic.
  5. Controlling Application Rates: Divide the roof into 100SF sections then monitor coating usage and adjust application technique to maintain consistency. A coating spreader or airless sprayer with a built in flow meter is recommended. Verify application thickness at 100 - 200SF interval with a wet mil gauge.

3.05 Application Rates

Substrate Base Coat Finish Coat
Standard
30 dry mils
EnergyGuard Silicone Roof Coating
1.40gal/100SF
EnergyGuard Silicone Roof Coating
1.40gal/100SF
Low VOC High Solid
30 dry mils
EnergyMax Silicone Roof Coating
0.98gal/100SF
EnergyMax Silicone Roof Coating
0.98gal/100SF

3.06 Care and Maintenance

  1. Reflectivity of coatings may be reduced if roof surface is not cleaned regularly.
  2. Follow our care and maintenance guidelines.

3.07 Protection

  1. Roof coatings are not traffic grade. Areas surrounding roof top equipment may be reinforced by embedding SeamStitch Polyester Roofing Fabric and applying a thicker membrane (40 - 50 mils). Walk pads should be used if frequent maintenance traffic is expected.
  2. Control overspray especially during windy conditions. Surfaces not to be coated shall be protected during the application of the system. If protection is not feasible, surfaces shall be restored to their proper condition by cleaning, repairing or replacing.
  3. All parking areas adjacent to (within 75 feet ) the work area are to be cleared and roped off.
  4. Protect work from damage due to subsequent construction activity on the site.

csi This product data sheet conforms to the editorial style prescribed by The Construction Specifications Institute.
The manufacturer is responsible for technical accuracy.