Polyurethane Roof Problems

Substrate Problems

• While the polyurethane foam itself is a type of substrate for the roof, it must be sprayed on another substrate, the wood or panels that are installed on the roof beforehand. Unfortunately, the bond between the foam and its own substrate is not always secure. If the substrate is dirty or warped, then the foam may not adhere properly, causing problems with the roof in years to come and eventually loosening large sections of the insulation.

Durability

• Polyurethane foam is durable substance, but over time it will grow weaker. As long as the foam stays beyond the reach of the sun it is relatively safe, but as the roof ages and sunlight starts to reach the foam it can quickly degrade. This results in roof damage, loss of insulation and eventually loss of roof structure integrity. Light degradation problems can be fixed, but major problems may require a complete replacement.

Experience

• As with many types of foam application, the quality of the foam can depend largely on the skill of the contractor applying it. A contractor without enough experience may mix the foam improperly and spray it inadequately, leading to a poor job. Repairing damaged foam is even more difficult, requiring additional coats and foam reparations that need a skilled contractor.

Leaks

• While evenly sprayed foam can stop leaks from making it through the roof, there is a danger that unknown gaps in the foam may encourage leaks, while also making them difficult to stop. Walking on the roof or the foam during repairs and insulation can also damage the foam barrier, giving water a way to get inside and cause damaging moisture problems.