Radiant Barrier - Exterior Wall Assembly

Saturday, October 28, 2017

A radiant barrier is the foil-faced roof decking (with the foil facing the attic side) that stops radiant heat gain through a vented roof assembly in hot climates.  is is usually one of the first upgrades for  existing construction if your roof design allows good access for installation, along with improving the insulation in the attic if needed. Note that radiant barriers require an open, ventilated air space on the side facing the house, so they should not be installed in a sealed attic, as they simply don’t work when foam insulation is in contact with them.

If you live in a cooling-dominated climate, you should also strongly consider using aluminum foil faced radiant barrier roof decking material with an emissivity of 0.05 or less26 to keep your attic cooler in the summer.  is will at least prevent much of the radiant heat gain through the roof assembly.  is results in helping to take some of the heat load o  your air conditioner and ducts during hot weather.

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