Foam Roof Insulation Problems

Spray foam roofing problems and myths answered spray polyurethane foam technology does not have a solid track record for commercial roofing.

Foam roof insulation problems. Some spray foam insulation sets rigid and can also be used to help reinforce roofs that are suffering from nail fatigue when the nails used to hold slates in place rust or support cavity walls where the wall ties are failing causing cracks and bulges in walls. The poor application of spray foam insulation by an untrained or unlicensed contractor can lead to several problems according to fine home building. 7 common problems solutions of spf roofing. Insulating with spray foam insulation at the roof line will cause moisture problems with the roof sheathing.

Poor ventilation equals condensation. Applying an even sheet of foam to the underside of a roof or other space can eliminate the routes that water vapor uses to leave the house. As spray polyurethane foam spf roofing becomes more popular for commercial roofing the benefits of installing a spray polyurethane foam spf roofing system rather than another roof type are numerous in terms of installation performance cost and longevity. Lstiburek takes blame for bad language.

In an unvented attic scenario to limit air leakage as well as any associated condensation at the roof line a continuous air barrier is required. The problem was that the installer was doing his first spray foam job ever and the thickness of the insulation varied from zero visible roof deck to about 9. Because a number of commercial roofing companies have installed this roof system poorly or incorrectly this misnomer is one of the greater misperceptions to emerge in the commercial roofing industry. This minimises the issue of cold air meeting warm air.

The essential guide to spray polyurethane foam roofing. The coverage needs to be uniform because a lot of heat will go through the under insulated areas. Over time trapped moisture can cause serious problems. It s not coming from above the roof and it s not some new moisture source resulting from the spray foam.

Unfortunately good average thickness doesn t cut it. Moisture generated indoors or that infiltrates into the home is responsible for the bulk of the moisture in an attic insulated with spray foam on the underside of the roof sheathing. However there are still some issues with spray foam insulation on the roof that can be avoided. Incorrectly installed spray foam insulation can trap moisture in the home encouraging rot and mold problems.