DIY Chatroom Home Improvement Forum

DIY Chatroom Home Improvement Forum (
-   Insulation (
-   -   insulating low pitch attic (

ratherbefishing 12-11-2011 12:45 AM

insulating low pitch attic
I'm about ready to start insulating my addition. I'd planned on using R-19 (code here) above the ceiling, but was convinced to buy R-30 instead. But my roof is such a shallow pitch (2.5/12) that the ceiling to roof is only 6" at the top plate. I do have the foam air channels stapled to the underside of the roof for ventilation. Even at the ridge, there's barely a foot and a half or so. It looks like R-30 wants to puff up to 9.5 inches or so.

Am I better off compressing the R-30 near the walls, or using R-19 (6.5" thick) and letting it puff up like it wants to?

Windows on Wash 12-11-2011 11:03 AM

You would be better with a rigid foam layer that could double as your vent chute and adjust your depth as needed as you go up.

ratherbefishing 12-11-2011 12:40 PM

Thanks, WoW. It looks like I have a little reading to do.

All times are GMT -5. The time now is 03:29 AM.

User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.