Archives for March 2013

Spray Foam Insulation and Roof Shingles – Dispelling Myths

There is a common misconception among homeowners that having spray foam insulation installed underneath the roof causes too much heat to build up under shingles, leading to damage or invalidating the shingle warranty. The truth is that heat does build up under shingles, but the rise in temperature is negligible.

It is true that you can never install fiberglass insulation up against your roof; however the reason is that air can pass through the insulation and cause condensation to build up under the shingles. Spray foam insulation does not trap air against the shingles so the dew point is irrelevant. In the past, contractors ventilated the roof to allow moisture to escape, not heat. A misunderstanding of the process led consumers and even manufacturers to back away from spray foaming near the roof.

Today, many shingle manufacturers accept spray foam insulation and understand that it creates a superior, tight environment that makes homes more comfortable and efficient. You can now have your contractor help you choose a shingle manufacturer that will warrant its products without worrying that your choice of the best foam products will jeopardize your roof’s integrity and longevity.

If you are planning to have your home re-roofed, or are building a new home, consult with your spray foam insulation specialist today to help you formulate the very best plan for your property.