Some like it Shiny
When it comes to energy efficiency and the roof, the city of Dallas provides three options.
Professionals can install radiant barrier under the roof deck, spray foam insulation with a minimum value of R22 or Energy Star-rated roof shingles.
As you can see, the ModelReModel went with the first option.
The use of radiant barriers varies between regions, but it’s a truly great product that’s seen big gains in popularity over the past few years. However, they’re still a lot of misconceptions about what a radiant barriers does and its strengths and weaknesses. Here are three things you should know.
Air Space
Foil radiant barriers lower the radiant heat gain in an attic and can reduce the temperature by an impressive 20-40 degrees.But, in order to do its job, a radiant barrier needs to have space for air on at least one of its reflective surfaces. If the shiny area comes into contact with another surface it will act like a metal spoon in a pot of hot soup, conducting heat and actually increasing the attic’s temperature. For that reason, never install a radiant barrier with its low-e surface in complete and direct contact with other materials.
Dust
Next is the question of dust. A radiant barrier can be placed right on top of the insulation on the attic floor or stapled to the bottom of the roof rafters. While the first option is easier to install, it also creates more accumulation of dust, which cuts down on the product’s effectiveness.
Shingles
Radiant barriers reflect heat and this causes a slight increase in the temperature of roof shingles—about 2-5 degrees. When the product was first used, there was some question about whether the shingles would be affected, but that has ceased to be a concern. No shingle manufacturer limits their warranty due to the use of a radiant barrier, according to the Reflective Insulation Manufacturers Association.
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