Spray polyurethane foam (SPF) roofing is made up of a closed-cell polyurethane foam that is sprayed onto the roof to create a thick waterproof layer. SPF roofs can last a decade or longer with proper maintenance and timely repairs.
1. Surface Deterioration
Aging and weathering lead to surface deterioration of the foam. The surface will begin to crumble, developing pits and pinholes. Having the roof treated with a UV blocking sealant at the time of installation can help prevent deterioration, but once it has occurred, this isn't an option. Generally, deterioration must be repaired by either replacing the roofing material or applying a new coating of spray foam.
Cracking is also typically caused by sun damage on the roof, and UV coatings are the best technique to avoid it. If cracking has already occurred, then the damage must be assessed. Minor cracking that has only affected the surface can sometimes be repaired with an acrylic sealant application. If cracks have begun to penetrate deeply into the SPF, then re-coating or replacement is needed.
Blisters occur when the foam layer begins to separate from the sub-roofing structure, creating air pockets or blisters. Water can leach into these blisters and then make its way into the building. The chances for more severe damage, such as chunks breaking free from the roofing or wind damage from uplift, are also increased as extensive blistering develops. The only repair option for a blistering roof is to remove it and recoat with fresh spray foam.
A puncture is typically caused by external damage, such as windblown debris or a dropped tool during a rooftop maintenance call. The foam is punched right through, sometimes all the way to the sub-roofing. All that is required here is a patch, thankfully. Your roofing service will cut out the damaged section of foam and apply fresh foam. An external sealer may also be applied to ensure that no moisture can leak in between the patch and the rest of the roof.
5. Pooling Water
Water that pools on the surface of the roof can eventually wear down the waterproof layer and make its way into the foam. The first step for repair is to drain the water and address the cause, which may entail clearing rooftop drains or installing a new one. Your roofer will then cut small slits in the foam to determine whether water penetrated into it. If it has, the affected foam must be cut out and replaced. Otherwise, the test slits will be sealed over.
Contact a commercial roofing company for more help with your spray foam roof.