Radiant barrier, best location
I am planning to install radiant barrier in my attic.
Now, let’s get a couple of things out of the way first:
– I live in California; it gets hot here
– I have AC ductwork in the attic. (The duct insulation is 4.2 and I _will_ be replacing it, but that’s a separate project.)
– I cannot convert the attic to a conditioned one, as a good part of it is not accessible
– I am also air sealing the attic (well, at least the accessible parts).
I estimate that I am going to need <$200 in material and a weekend of work. Can’t go (very) wrong, right? The question I have is: where does the radiant barrier go? I can: 1) Staple it directly to the underside of the roof sheathing. 2) Staple it to the rafters, leaving an air gap between the barrier and the sheathing. 3) Do both – at least in the critical areas (south side). Ideas, suggestions, comments? Thanks! Bart