Radiant Barrier Attic Rafters

So you would order 2 500 sq ft of atticfoil to cover an area this size.

Radiant barrier attic rafters.

The heat escaping in the winter will be blocked at the insulation level while heat radiating down in the summer will still be blocked from reaching the living space. The results were very telling. Radiant barriers are utilized to reduce summer heat gain in attics. A radiant barrier works best when it is perpendicular to the radiant energy striking it.

A control study was published in 2013 showing the radiant barrier effectiveness of paint foil backed sheathing and foil that was stapled onto the rafters. A radiant barrier reduces the radiant heat transfer from the underside of the roof to the other surfaces in the attic. 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. When a good radiant barrier is employed under the attic rafters directly before the sheathing decking new construction or along the bottom of the rafters preexisting construction a majority of the heat is reflected back through the roof and never enters the attic at all.

This combines both of the standard installation methods and the benefits that each of those methods offer. 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. Radiant barrier installation attic radiant barrier installation most of the heat entering a home comes through the roof. A radiant barrier under the rafters will keep more heat in the roofing and hence somewhat reduce the lifespan of the shingles and it will limit drying to the interior should there be a roof leak that saturates the sheathing unless the rafters are vented from bottom to top.

Attic area of 55 x 35 1925 sq ft x 1 3 for a medium pitch roof about 8 9ft high at peak 2 503 sq ft. Radiantguard radiant barrier foil insulation installed in an attics can reduce attic temperatures by up to 30 degrees when stapled with a staple gun to the underside of roof rafters by reflecting up to 97 of the radiant heat that strikes its surface thereby reducing heat. The hot roof material then radiates its gained heat energy onto the cooler attic surfaces including the air ducts and the attic floor. A radiant barrier applied horizontally over the attic floor insulation is the more popular application for existing homes in cool climates.