Originally Posted by AtlanticWBConst.
FWIW: If anyone were to use the Reflectix, it must be installed with another solid nailing surface attached over it (like strapping) - when sheetrock is intended to be applied.
That is per Reflectix's manufacturer direction.
(It doesn't say it on the packaging, we had to call the plant directly and speak to their technical engineer about that. Our concerns were regarding the drywall screws "popping", if sheetrock were to be applied directly over Reflectix, which is over studs/rafters/joists. Reflectix confirmed that they did not recommend sheetrock be installed directly overe that product for the same reasons... use strapping)
Well said about avoiding the Reflectix between wood/metal joists and drywall.
You can however, acheive satisfactory results by stapeling the Reflectix along the left and right hand sides of studs in a "U" fashion. Then insert the fiberglass R-13. I'm in the camp which believes that the spray in poly-foam is the absolute best for a watertight/condensation, heat and sound retention/reflection as well.
Recommend that you hire a seasoned pro for this type of project.
Then, take the famly out of town for an overnight until the place airs out.