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Old 04-12-2012, 01:35 PM   #1
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Tyvek, Insulation or both


I've researched this for the past week and still can't come up with a definitive answer. I've decided to let my decision rest on the responses from this forum.

Re-siding house. OSB, flanged windows (not replacing them), replacing front door/deck door (french). I am using tyvek flexwrap/straightflash flashing system on both doors and over the window flanges.

First question, do I go tyvek and insulation (1/2" dow super tuff r)? Just tyvek? Or just insulation taped at the seams?

Second, since I am replacing the doors, should I install the insulation sheets all the way to the rough opening, or install the door first and butt the insulation to the brickmold? I don't know how well the straightflash will adhere to the insulation.

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Old 04-13-2012, 07:39 AM   #2
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Tyvek, Insulation or both


Depends on where you live. Insulation on the outside of the house must allow moisture to get out, or you will have moisture trapped in the walls, NOT good. Tyvek is desighned to allow moisture thru from the house, but stop rain/wind, so yes to tyvek.

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Old 04-13-2012, 07:50 AM   #3
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Tyvek, Insulation or both


+1

Where is the home?

In terms of order, there are multiple schools of thought on the arrangement.

I prefer the tyvek to be the last layer but it is somewhat dictated by the placement of the windows.

If they windows are and inside (i.e. inside the foam) most will put down tyvek, then foam.

I would also recommend a non-foiled faced foam as that is a vapor retarder (Class I) at that point. That foam wall will not allow moisture out.
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Old 04-13-2012, 10:28 AM   #4
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Originally Posted by Windows on Wash View Post
Where is the home?
I am in a Mixed Humid zone roughy 30 miles north of Philadelphia which I believe is zone 5?

I now plan on furring out the existing windows with the new doors to make the surface depth even with the insulation. Was at lowes today and they had both foiled and non foiled sheathing in 1". There was a lot less non foiled on the shelf which makes me think that installers in my area go with non-foiled insulation over foiled.
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Old 04-13-2012, 03:02 PM   #5
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I prefer the tyvek to be the last layer but it is somewhat dictated by the placement of the windows.
How would I attach it to the foam?
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Old 04-13-2012, 07:10 PM   #6
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Tyvek, Insulation or both


What type of cladding?

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Old 04-13-2012, 08:28 PM   #7
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What type of cladding?

Gary

OSB, 1" Insulation then Tyvek.
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Old 04-13-2012, 11:29 PM   #8
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Sorry, by "cladding", I meant siding....

You don't want foil-faced foamboard; "Vapor management" pp.14: http://www.buildingscience.com/docum...ting-sheathing

As per that article, I would install the H.W. on the OSB, using a "Stucco wrap" for the air space, then the foamboard over it. http://www.buildingscience.com/docum...d%20in%20walls

This will prevent "wind-loading" of the H.W.
Depends on the siding..... if you need a "rainscreen" system or not. You have about 40" rain annually.

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Old 04-14-2012, 08:36 PM   #9
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Originally Posted by GBR in WA View Post
Sorry, by "cladding", I meant siding....
I am using vinyl siding.

Where can I purchase stucco wrap? I have read a lot of people say that vinyl siding is not a complete water barrier, wouldn't I want to use the H.W. on top of the insulated sheathing, especially since the insulation will not be foil-faced and therefore absorb water?
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Old 04-16-2012, 12:54 AM   #10
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Be sure to pay attention to details when applying it- reverse laps, etc.http://www.buildingscience.com/docum...d-wall-systems

http://www.buildingscience.com/docum...m-shrinks/view

The closed-cell (XPS) is very dense, absorbing minimal water; http://msdssearch.dow.com/PublishedL...romPage=GetDoc


You need the stucco wrap between the foam/OSB to dry the OSB if it ever gets wet. Read "Practical recommendations." at end, notice the second and third ones: http://www.nrc-cnrc.gc.ca/eng/ibp/ir.../ctus-n32.html

Gary

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