Do I Need Vapor Retarder In Seattle? - Insulation - DIY Chatroom Home Improvement Forum
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Old 12-09-2018, 02:25 PM   #1
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Do I need vapor retarder in Seattle?


I guess Seattle WA is in marine climate.

Do I need to install some kind of vapor barrier/retarder? If yes, which side of insulation should the vapor barrier/retarder be installed? I do use AC for ~2 weeks in the summer. The house is next to a lake.

Should I buy faced or un-faced fiberglass bat? What’s the purpose of that paper?

When painting the Sheetrock/drywall, does the paint have some vapor barrier function built in the paint? An insulation contractor told me we don’t need any vapor barrier on insulation because the paint has that feature built in. I’d like to check whether he is right or not.

Thanks!
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Old 12-09-2018, 04:05 PM   #2
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Re: Do I need vapor retarder in Seattle?


The short answer is that air leakage is more of an issue than the vapor barrier.

Vapor barriers were an exaggeration of the 70's and 80's that have been hard to correct. I'll add a link that explains it better.
https://www.greenbuildingadvisor.com...vapor-retarder

And yes, the paint serves as a vapor retarder and is probably all you might need. Air seal, Air seal, Air seal.

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Old 12-10-2018, 01:21 AM   #3
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Hi Bud, thanks for your input! I think you’re right. I plan to tape the seam of exterior plywood sheathing, add two layers of grade D 60 minutes paper before putting on stucco siding, of course caulk all holes gaps on the sheathing, that will be good in air sealing I think.
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