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How much weight does the Spray Polyurethane Roof add to my existing roof?

April 26, 2017existing polyurethane roof spray weight

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How much weight does the Spray Polyurethane Roof add to my existing roof?

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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.