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Old 01-31-2010, 11:59 PM   #1
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Faced or Unfaced Insulation ? - Room below porch


Hi, I'm putting in a bathroom in an exterior room that has an outdoor porch above it. The porch has a roof over it, but has open walls, so when it rains, the porch will still see a little bit of water. Below the porch there's a room that I'm putting a new bathroom in. I'm going now to put insulation in the ceiling joists, but I wasn't sure if I should use faced or unfaced. I think the porch is sealed relatively well, so I don't anticipate there will be much moisture there, but I want to make sure I do the right thing so I don't have a problem down the road. Any suggestions?? Thanks!

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Old 02-01-2010, 10:12 AM   #2
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Faced or Unfaced Insulation ? - Room below porch


Faced insulation is used for a vapor retarder, plastic for a barrier
The paper goes towards the heated space
You still want to minimize water vapor coming thru the ceiling

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Old 02-01-2010, 10:29 PM   #3
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Faced or Unfaced Insulation ? - Room below porch


You need R-49 in the roof for your location: http://www.ornl.gov/sci/roofs+walls/...on/ins_16.html

Are your sloped rafters above 14" thick for this glass batt insulation?

May want to think about foam or foam board: http://www.buildingscience.com/docum...aspen-profile/

Is it ventilated?

Be safe, Gary
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