Life Expectancy of Sprayed Polyurethane Foam Roofs
There are no known end of service life figures for SPF. Generally, if SPF is pressure washed and sprayed with a top coat every 15 to 20 years this system will last decades. SPF shows little sign of deterioration or change in physical properties even after 30 years.
Condensation Concerns of Sprayed Polyurethane Foam Roofs
SPF provides a continuous air barrier preventing moisture through air leakage, minimizing dew point problems and condensation within the building envelope avoiding thermal bridging, resisting heat movement in all directions and providing reliable performance under varying conditions.
SPF roof systems can be applied directly over BUR, modified-bitumen, concrete, wood, asphalt shingles, clay tile, and metal.
Since it adds very little weight (about 8oz. per square foot at 1 inch thick) SPF is uses as a recover system over existing roofs without the need for tear-off. This reduces the amount of construction debris in landfills.
Also if no tear off is needed, exposing the interior of your building to the elements is eliminated.