To Add A Vapor Barrier Or Not? - Insulation - DIY Chatroom Home Improvement Forum
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Old 08-18-2015, 09:37 AM   #1
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To add a vapor barrier or not?


Am looking for a friend who is building a cabin. It will be his home for some time while he builds his main house. The cabin is in the Carolina's. It has a metal roof and hip rafters to give added height in the loft area.

My question is regarding a vapor barrier. He is getting ready to install insulation in the ceiling. He is asking if he needs a vapor barrier or not. The insulation is craft faced and is being covered with t&g pine. If he needs the barrier what is best? Plastic or something else? If plastic what mil should he use?

I have insulated many times but for some dumb reason I never learned what I was doing. I just was told to do this and that and the job was in. I was young with a who cares attitude. Now I wish I had that training again I would have listened better. Still don't want to insulate though.
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Old 08-18-2015, 11:07 AM   #2
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T&G is a notorious leaker and will stream air right through it.

I am guessing this is going to be a vaulted ceiling?
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Old 08-18-2015, 11:34 AM   #3
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Yes it's vaulted truss that we are dealing with.
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Old 08-18-2015, 11:51 AM   #4
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I would look into this product.

Getting that ceiling plane to be as airtight as possible is critical and T&G does not that accomplish.

http://www.certainteed.com/products/...vention/317391
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Old 08-18-2015, 01:42 PM   #5
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Thanks I'll mention that to him. Seam tape over or just overlap?
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Old 08-18-2015, 03:10 PM   #6
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Both.
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Old 08-18-2015, 03:11 PM   #7
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Ok thanks again. I'll let him know.
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