*
Resently, we added on a kitchen / mudroom to our home. For the ceiling in the kitchen we left the joists exposed with 2x6s visible across them. To insulate above this I used the “non-itch” R-25 batts from Owens-Corning that are wrapped in thin red plastic. They are great to use. Truly “non-itch”. But, will this offer the necessary vapor barrier or should I have put something down before the batts were rolled out? Like maybe house wrap or tar paper or …?
Wudda ya think?
Thank you – David
Discussion Forum
Discussion Forum
Up Next
Video Shorts
Featured Story

Freestanding with boxed stairs, this small deck is full of ideas for a long-lasting entry that will look great for years to come.
Featured Video
Video: Build a Fireplace, Brick by BrickHighlights
Fine Homebuilding Magazine
- Home Group
- Antique Trader
- Arts & Crafts Homes
- Bank Note Reporter
- Cabin Life
- Cuisine at Home
- Fine Gardening
- Fine Woodworking
- Green Building Advisor
- Garden Gate
- Horticulture
- Keep Craft Alive
- Log Home Living
- Military Trader/Vehicles
- Numismatic News
- Numismaster
- Old Cars Weekly
- Old House Journal
- Period Homes
- Popular Woodworking
- Script
- ShopNotes
- Sports Collectors Digest
- Threads
- Timber Home Living
- Traditional Building
- Woodsmith
- World Coin News
- Writer's Digest
Replies
*
I am pretty sure the bats don't count as vapour barrier. The ones I have seen have a zillion holes in them, probably to let air in/out during installation. Where I live the only legal vapor barrier is 6 mil poly, and it has to be installed on the warm side of the insulation (i.e. before the drywall goes on).
Not meaning to sound repetitve, but if the board is already up, you could look into vapor barrier paint. I have read about it, but never used it.
*From what I understand two coats of gloss latex enamel work well as a vapor barrier. It's not as good as the more expensive and sometimes hard to find vapor barrier paint. A little research may save some money.