Next to shingles, underlayment is one of the most important components in building an optimal roof. But what is underlayment and why is it so important?
Underlayment is a membrane that is applied over the deck of a roof before shingles are added. Historically, underlayment is a black felt paper that has been coated with asphalt to help bond with the shingles. The underlayment acts a water barrier to help to protect the seams and joints in the plywood roof deck from moisture while still allowing the deck to breathe. It also assists in creating a seal around nails in the roof to prevent leaks.
Today, there are many options for roofing underlayment materials from rubberized asphalt to organic, fiberglass to synthetic. Synthetic underlayment is designed to add even more protection during extreme weather conditions and can be specific to certain types of shingles.
Below are the brands of underlayment we carry. For additional information or help selecting the underlayment that is right for your project, visit one of our twelve Southwest showrooms and have an RWC roofing expert assist.