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Posted by jb on November 6th, 2001 09:53 AM
In reply to Attic Insulation by James Swanson on November 5th, 2001 10:45 PM [Go to top of thread]

Rafters 30" to 35" O/C sounds odd. What do you have for roof sheathing that spans that far? Do you have cross blocking 16" or 24" O/C? If so, this could create a problem for venting above the fiberglass with "vent keepers", as they would block the airflow from soffit to ridge. Your best bet is probably a "build down" to maximize r value and venting. You need ridge vent and soffit vent and air space between ply and batts/blown. See this article (2 pages long):

You also need to confirm that your floor framing is up to the task. Jay is right, your homeowners insurance would not pay out if your attic joined your bedroom b/c it wasn't framed right/permitted with the town.
What about heating/cooling? I would think this should probably be a separate zone for heat/cool. You'll be sorry if you don't fully anticipate these needs before the drywall goes up. Remember, if you have hot air heat that a return duct is as important as a supply duct. Also put in plenty of phone/catv/network wiring as your kiddies will need it before long.

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