Unless a cover board is used, spray foam cannot be installed over a TPO roof. The shortfall with a TPO roof is that it is not completely adhered to the roof deck as the material is just heat-welded at the seams and not attached to the substrate at all.
However, Norris Spray foam has had many successful projects which resulted in spray foam roofing over a TPO roof. We start by making an inspection of the roof under the TPO layer and make any repairs or augmentations needed. Then, we use a cover board that we fully adhere to the roof substrate which can accept the spray foam roofing material.
What is a TPO roof?
TPO is one of a few different types of rubber, usually a blend of polypropylene and ethylene-propylene rubber. These single ply roofing systems are a dependable and energy efficient roofing system that lowers your home’s overall construction costs. TPO roofing systems are quite common in both home and commercial roofs.
Like all synthetic roofing options, no two companies produce the same formula of TPO. Instead, they alter it just enough to create their own brand. All of it results in a membrane material, between 40 and 100 millimeters thick that gets attached to a roof deck.
TPO is known as a single-ply application, meaning one sheet is sufficient to achieve the benefits. It competes each year directly with EPDM, and PVC membranes (PVC is similar in application methodology to TPO) with some of the same benefits, but with each system having its unique pros and cons.
Reroofing with spray foam is also possible on these other commercial roofing system types.
Built Up Roofing Systems | EPDM | Metal Roofs | Modified Bitumen Roofing System | Single Ply | TPO