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Choosing The Best Truss Roof Underlayment

The roof underlayment on a truss roof is one of the most important components in your entire home when it comes to energy efficiency and insulation. Even though you cannot even see this underlayment, it has a big impact on how well your home can withstand the elements.

The actual material on the outside of the truss is also important. But, if your roof has a proper underlayment, then you can basically install any roofing material on top of it. For instance, wood shingles usually don't have amazing insulation, but they can still be used in pretty much any climate, as long as they have the appropriate insulation underneath them.

Different Underlayments

There are many different materials and styles of underlayment, and the best product really depends on what roofing material you choose, the design of your roof deck, and how much insulation you need; this article explains a few of the most common types of underlayment.

Spray Foam

Spray foam is an underlayment that is relatively new; this affordable foam is sprayed directly onto your roof deck. The on-site application actually makes it more affordable. It is very cost effective, and it provides great insulation for cold climates. A coat of spray foam adds a soft layer over the roof deck. Pretty much any lightweight roof material can be installed on top of it. However, if you have a steep roof pitch, it may not be practical to use a heavy tile material like slate or other heavy stones .In the end, spray foam roof is one of the cheapest and most practical solutions for the majority of roofing materials.

Styrofoam Sheeting

Styrofoam is another popular form of underlayment. It usually comes in large 4' x 8' sheets that can be easily glued or stapled to the roof deck. Then, the roofing material can be attached right on top of it.

Wooden Framing

Wooden framing underlayments can be a great solution for heavy roofs. That is, the roofer will build an extra layer of wood, with a cavity between the underlayment and the deck; this cavity becomes a very practical buffer zone underneath your roofing material. Wooden underlayment are built using normal plywood, which is very affordable. The wood itself isn't the best insulator, but the gap between the deck and underlayment adds some effective insulation. The supplies are cheap, but the building of the framing can be costly.

These are three of the most common roof underlayments that can be used on residential properties. To learn more, contact a company like Campbell Truss Company Inc


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