Roof Radiant Barrier Under Shingles

Increasing summer energy consumption and cooling costs.

Roof radiant barrier under shingles.

April 19 2019 posted in. If the roof deck sheathing is installed with the radiant barrier facing into the attic space the radiant barrier must be perforated. In these attic space applications there is an air space below the radiant barrier. Radiant barrier damages roof shingles.

You are getting a new roof so why not scrape off the shingles put down roofing felt thenradiant barrier foil and thenshingles right on top. When the sun heats a roof it is the sun s radiant energy that makes the roof hot. Radiant heat travels in a line and heats anything solid within its path. There are a number of ways a cool roof can be created including the installation of radiant barriers within the attic as well as radiant shingles on top of the roof.

You can install the radiant barrier foil below the raised shingles either on top or below the battens. There is a misconception that if the heat is coming in through the roof shingles and strikes a radiant barrier only to reflect back out of the roof shingles then it will be twice as hot. At first it sounds reasonable. Radiant barrier applied either under the roof rafters or under the roof sheathing is probably the most common application of a radiant barrier but many homeowners shy away from it because they don t fully understand what radiant barrier is or how it works.

The temperature of the attic space increases and that heat is transferred to the building below. The florida solar energy center also conducted a study on the use of radiant barriers under shingle roofs and found that properly installed radiant barriers do not void the warranty for the shingles. Roofing material warranties are not affected by the installation of radiant barriers. Radiant barrier under shingles scams bad information foil under shingles will not create a radiant barrier unless there is an airspace on one side of the foil.

A radiant barrier can be effective with an asphalt shingle roof only when installed inside the attic either to the underside of the roof decking or to the underside of the roof rafters. Attics heat up when the sun s radiant energy heats the shingles and the heat is transferred to the interior attic space through the roofing materials via conduction. Radiant barriers are utilized to reduce summer heat gain in attics. Radiant barriers integrated with the roof deck sheathing installation of tamko fiberglass asphalt shingles onto roof deck sheathing with an integrated radiant barrier is acceptable.