foam board on ceiling above sheetrock

Old 02-17-14, 07:38 AM
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foam board on ceiling above sheetrock

I'm adding a little bumpout to my house. It will be a nursery for a couple years before it becomes an office or storage.

There isn't going to be a lot of room in the ceiling for insulation and I can't afford spray foam right now.

I was thinking of putting up either half inch pink foam board or the foil faced yellow urethane foam on the joist. I would start with the outside side of the of the space, where the roof joists meet the outside wall. Here there is very little room at all for insulation. Just a few inches. I was thinking of putting great stuff on top of the foam board so it fills in to the foam air baffle (at the very narrowest side) below the roof sheeting.

I might put a 1 inch layer of great stuff above the rest of the ceiling by doing only a small section of foam board at a time. Then I would fill in unfaced fiberglass above that. Sheetrock would go below the foam board.

Does this sound like a workable idea? Would there be a condensation concern?

Thanks to anyone who can help.
Old 02-18-14, 08:25 AM
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The foam board might be okay. I don't know about the great stuff. I'm not a fan, of it.
Old 02-18-14, 09:30 AM
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Why not cut foam to fit between the ceil. joists and place them just above your bottom edge and foam seal the edges with the great stuff.

Great stuff in a can in designed more for gaps rather than surface application. If you want to get a small spray kit of 2 part spray foam you can find those on line or probably get through an insulation contractor.

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