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Old 02-10-2009, 08:50 PM   #1
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Attic Insulation question


I am converting my attic into a master bed. I am about to run my ventilation channels in my 2X6 rafters. I have 3 skylights about 3' from my knee wall. How do I get ventilation from soffit to ridgevent with the skylight in the bay? Also, should I overlap the channels or leave a space between each one. If space, how much?


Last edited by Vermont1; 02-10-2009 at 08:52 PM.
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Old 02-11-2009, 04:54 AM   #2
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Attic Insulation question


You don't get ventilation in the skylight bays.
I just butt the ends on the baffles.
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Old 02-11-2009, 12:01 PM   #3
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Attic Insulation question


I assume this is for a cathedral ceiling. If you live in Vermont you will never get enough insulation into a 2 x 6. I would recommend going above code to prvvent ice dams to R40 or R50

I think the Dept of Energy recommends drilling holes at the top of the rafters to allow air to flow from one channel to the next around skylights. Exactly how to attach the air channels is some custom work. The air channels need ~ a 2" gap between each piece of styrofoam. THe styrofoam web site shows it.
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Old 02-12-2009, 08:58 PM   #4
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Attic Insulation question


I actually live in MA. This is a Cape Cod second floor. I am putting R21 (5 1/2") in the bays and 1" Rmax before sheet rock. This should give me approx R28. Across the top I am putting R30.
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