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Sprayed Polyurethane Foam (SPF)



Asphalt Shingles    Built-Up (Tar & Gravel)    Copper    EPDM (Rubber)    Metal Roofs
Modified Bitumen    PIB    PVC    Slate    Spray Foam    Tile (Clay and Concrete)
TPO (Single-Ply)    Wood Roofing

INSTALLATION
The "A" and "B" components of SPF are pumped out of separate 55 gallon drums, are mixed at the spray gun, and are applied in what are known as "passes". A pass is a single application of foam and can vary in thickness from 1/2 inch to 1 inch or so. Therefore, SPF roofs that are several inches thick are applied in multiple passes.

SPF must have a protective elastomeric coating installed over it because it's very susceptible to UV and mechanical damage. Elastomeric means the coating must be able to stretch with the foam and return to its original shape. Coatings are spray applied and can be acrylic, silicone, butyl rubber, and different urethanes. All have different physical characteristics and varying costs. Coatings are usually installed in three stages: a base coat, a mid-coat, and a final coat. Granules can be embedded into the mid and top coat or only the top coat for added protection against UV and mechanical damage and to increase the system's fire resistance.

 

  
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