Frequently Asked Questions
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SPF is a closed cell roofing material formed by the combination of two liquid components. When these two materials meet in the mixing gun, they immediately expand 20-30 times their volume. The roof is sprayed to the desired thickness, usually 1-2 inches. The entire roof is sprayed to form a seamless monolithic surface including flashing, penetrations and parapet walls; this eliminates seams and cold joints, the major source of roof leaks.
SPF can be applied directly over any roof – BUR, modified bitumen, wood, concrete, asphalt shingles, clay tiles and metal.
In most cases SPF can be sprayed directly over existing roof. The roof must be cleaned of all dirt and debris, if underlying areas are saturated a minimal tear-off may be required.
SPF is lightweight, weighing 8 ounces per square foot, one inch thick. If the roof happens to be tar and gravel all loose gravel will be removed. This will actually remove weight before the foam is applied so this roof will have less weight on it with the Polyurethane Foam over the tar and gravel than it did with just the tar and gravel.
Within minutes of the application the roof is firm enough to be walked upon. We do ask you to give the coatings 5-7 days to completely cure before walking on the roof too much.
Yes a SPF Roof will give you an r-value of 7, which makes it the most efficient form of insulation.
SPF is seamless so the area that is ponding can be built up to the desired thickness by spraying more foam in the area to assure proper drainage.
No, the topcoat may be painted to any desired color but remember the white coating further reduces heat load and thermal stress to the roof. A gravel layer of ¾” to 1” thick may be applied in some flat roof applications.
In most cases the damaged area can be sealed with a recommended caulk. Then call you Roof Specialist to inspect it to be sure all damage has been properly completed.
The SPF Roof will last indefinitely as long as the coating is redone every 8-10 years and any damage done by workers is repaired properly. The mistake people make with their roof is they never pay attention to it, until it starts leaking. Every roof should be inspected yearly by you or a Roof Specialist; this will insure you will find problems before they get out of hand.