Q: How long does a spray polyurethane foam (SPF) roof last?
A: The oldest performing SPF roofs are over 30 years old. Because of the physical properties of the SPF change little with age, how long the SPF roof system last depends on the original application and long term maintenance.
Q: How do you maintain a SPF roof system?
A: SPF roof systems should be inspected semi-annually and after events that cause physical damage. Small dents, cracks, punctures from dropped tools, wind driven debris can be repaired with an elastomeric sealant compatible with the SPF and coating system. Reapplying SPF would repair more extensive damage. Typically SPF roof systems are re-coated every 10-15 years, depending on the type and thickness used and factors specific to the roof. Re-coating extends the service life of SPF roof systems.
Q: Where can I use an SPF roofing system?
A: SPF has excellent adhesion to a variety of substrates including, BUR, clay and concrete tile, shingles, metal, and wood. Since SPF adds little weight, it can be applied in varying thickness to add slope and fill in low areas.
Q: How does SPF reduce energy use in buildings?
A: SPF provides a continuous air barrier, prevents moisture infiltration through air leakage and minimizes dew point problems and condensation. SPF effectively resists heat movement in all directions and provides reliable performance under varying conditions.
Q: If you spray the underside of a roof deck with SPF insulation should you vent the attic?
A: No, the application of SPF insulation to the underside of the roof deck minimizes the potential for condensation. The SPF insulation develops a thermal and moisture gradient that avoids the development of dew point conditions in the attic, so moisture won’t condense or accumulate and therefore does not need to be vented to the exterior.
Q: Is SPF a good soundproofing material?
A: Both low and medium density SPF effectively reduces noise from outside sources by sealing cracks and gaps that allow sound to travel through the walls, floors and ceiling of a building.