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Old 12-11-2011, 01:45 AM   #1
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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?

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Old 12-11-2011, 12:03 PM   #2
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insulating low pitch attic


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.

http://www.buildingscience.com/docum...f-venting/view

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Old 12-11-2011, 01:40 PM   #3
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insulating low pitch attic


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