3/4" Styrofoam & House Wrap - Insulation - DIY Chatroom Home Improvement Forum
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Old 03-13-2013, 09:13 PM   #1
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3/4" Styrofoam & House wrap


I have an old house & I am going to reside the house. I cant to put 3/4" styrofoam on & house wrap. Is that a good thing to do or not? Or what should I do? I have been reading online & there are so many different ideas. If it dose help I live in MN.

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Old 03-13-2013, 09:28 PM   #2
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I'd stick with just the house wrap, reason being the foam will act as a vaper barrier.
You do not want moisture trapped in the walls.

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Old 03-14-2013, 08:42 AM   #3
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What type of foam is it?

EPS (typically referred to as Styrofoam) is very vapor open and does not create a vapor trap.

That being said, 0.75" of EPS has a minimal R-Value. In order to make the proper recommendation, we need to know what the wall construction is right now. Is it insulated, 2x4 or 2x6, any other details, etc.
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Old 03-14-2013, 09:37 AM   #4
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Also adding any thickness to the outside wall will cause a lot more work building out all the window and door trim before it can be wrapped.
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Old 03-14-2013, 09:52 AM   #5
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foamboard is a great choice energy wise. Your insulation in the existing walls is going to slow down your convection. The foamboard under the siding address your thermal bridging, which is an entirely different issue.
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Old 03-14-2013, 10:23 AM   #6
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It is a 2x4 wall. & the styrofoam I was thinking of using is the bead board kind
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Old 03-14-2013, 12:12 PM   #7
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In this case, it can't hurt.
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Old 03-16-2013, 10:21 PM   #8
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http://publicecodes.cyberregs.com/ic..._11_par002.htm

http://www.buildingscience.com/docum...r-requirements

http://www.buildingscience.com/docum...ting-sheathing

No poly sheeting under drywall.

Gary

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