Question by Tynman: Radiant barrier in attic – both under rafters and over insulation?
Hello, I am thinking about installing Radiant Barrier type product in my attic to save on energy costs. I was reading over the recommended installation methods and most of them say to install it under the rafters in the attic OR over the insulation on the attic floor. Does it make sense to install Radiant Barrier on BOTH the rafters and over the insulation? Or does that create a worse oven that what already exists in an attic without Radiant Barrier?
I’m not really concered about the cost. I’m curious to know if installing under the rafters AND over the insulation is more efficient? Or is it less efficient and should I just stick with one or the other.
Answer by JamesD
It’s just a chance to spend more money. I would put the radiant barriers under the rafters. That way if you have to have something installed that needs to use the attic you don’t have to worry about whom ever stepping through the radiant barrier and then the ceiling.
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