Roofing Question – Over-Roofed Spray Foam Problem
I have two roofs on campus that were over-roofed with spray foam approximately 10 – 12 years ago. In one instance, the foam has large bubbles and even holes in many dozens of locations. Fortunately, only one leak apparent inside. Any experience with how to remove this and reroof?
Our experience has been to remove the existing foam roofs and underlying roof system to the deck and to reroof. Typically foam roofs we experience are over-roof applications and the original roof is still working to some degree. Often there is trapped water between the two roof systems. We have not seen much success repairing foam roofs of this vintage. Foam roof removal and reroofing is pretty straight forward. We recommend a design, construction documents, and periodic roof observation during construction for best reroofing project results.