Vapor barrier with house wrap

[NXGTS]

Believe it or not I did do a search and could not find the answer to my question.

I was talking to a coworker today who just got done finishing the interior of a one car garage. He told me used unfaced insulation because the garage already had a vapor barrier. As we talked more he said the barrier was house wrap. I didn't think house wrap was considered a vapor barrier.

After I finish the electric rough in I will be insulating. I was going to use kraft faced insulation both on the walls and the ceiling. I also have house wrap on the outside walls. This is also how my house is built. My question is with the house wrap. Will this cause a moisture problem inside my walls? Will the house wrap keep the moisture from escaping?

 

[rockchucker]

I would use the Kraft Faced Insulation. Most Housewrap's are Breathable. They also have different qualities for different locations and humidity levels.


http://typar.com/pdfs/Typar_vs_Tyvek.pdf

Houses HAVE to breathe and I don't understand why most people don't understand this these days.

 

[NXGTS]

I guess it's a good thing I used Typar. It looks like kraft faced it will be.

Thanks.

 

[ForceFed70]

House wrap is not a vapor barrier. Good thing as it would be on the wrong side of the insulation anyway.

 

[rockchucker]

No worries!


I still am not a huge fan of using Vapor Barrier (Plastic Sheeting) on ANY part of a House. Houses need to breathe.

 

[ForceFed70]

No worries!


I still am not a huge fan of using Vapor Barrier (Plastic Sheeting) on ANY part of a House. Houses need to breathe.

Yes, but a breathing house is a house they costs a lot to heat.

My opinion is that it is required in some parts of america, and is not needed in others. Any place where it actually get's cold out, a house should have the barrier. Especially if you add humity due to the dry winter air.

 

[jimp]

House wrap on the outside. No vapor barrier! This stops most wind leakage but allows moisture to escape.

I built an air conditioned outhouse (shower and tolet) for the year it took to buid my house. It had house wrap on th outside and a vapor barrier on the inside (no other finish on either side). Well in the KC area it collected enough moisture on the cooled vapor barrier that water ran down it to the sill. Mold and rotten sills are not something I would want.

 

[mrpowderkeg]

It's code here to have a vapor barrier on the inside walls, and a house wrap on the outside. If you are having issues with moisture on the inside, then you need an air exchanger. Several things that I have seen that cause problems are not properly using bathroom fart fans, and ventless range hoods. Gotta vent sources of moisture.

 

[Falcon67]

I wrap my shop builds with 15 lb roof felt. Cheaper than housewrap, does the same thing. Inside I just used the kraft faced batts - fairly dry here, no real winter or summer issues. High humidity here is 60%, more if standing in a driving rain. Typical RH is 30% and under.

 

[jimp]

It's code here to have a vapor barrier on the inside walls, and a house wrap on the outside. If you are having issues with moisture on the inside, then you need an air exchanger. Several things that I have seen that cause problems are not properly using bathroom fart fans, and ventless range hoods. Gotta vent sources of moisture.

Our building inspector discourages vapor barriers and after what I saw, I agree. The water was on the outside of the barrier.

I can see an argument for either way, I just don't want one and will not use one.

Make up your own mind, but you will need to follow the codes requirments.