Quote:
Chris in Dallas wrote:
 You should be able to fill in the gaps between the rafters and the foam board with a spray polyurethane foam. You can buy a kit that delivers an expanding bead from a straw-like nozzle. Or, you can buy a lot of cans of "Great Stuff," which is the same thing in individual cans.
One more thing: put a 1/2" thick sheet of polystyrene foam board under the rafters before putting the gyp up. This will create a thermal break for your rafters. Otherwise, you'll have hot lines. It'll cost you that 1/2", though. |
Yup - we did use the spray foam for the gaps - but it was pretty time consuming. We used a smart vapor barrier between the drywall and the joists/foam to provide an extra layer of protection. So far, it's worked pretty well.