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Old 02-19-2011, 10:01 AM   #1
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installing tyvek house wrap


I am adding 2inches of strofoam to the exterior of my home. The walls are 2x4. I want to use tyvek as a air barrier. My question is where do I apply the tyvek. On the walls prior to the styrofoam or after the styrofoam is applied


Last edited by Bill Mitchell; 02-19-2011 at 10:05 AM. Reason: mispelled
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Old 02-19-2011, 12:03 PM   #2
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installing tyvek house wrap


Welcome to the forum!

1. What type of siding will go on the outside?

2. Type of insulation in cavity?

3. Type of sheathing?

4. Location?

Gary

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Old 02-19-2011, 12:53 PM   #3
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installing tyvek house wrap


Bill -

Tyvec is not an air barrier. It is water barrier that allows air to pass through.

Dick
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Old 02-19-2011, 06:07 PM   #4
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Originally Posted by concretemasonry View Post
Bill -

Tyvec is not an air barrier. It is water barrier that allows air to pass through.

Dick

Actually that is wrong. It is an air barrier. Air will not pass through it. It is also a liquid water barrier. What it does allow to pass is water vapor.

http://www2.dupont.com/Tyvek_Weather..._homewrap.html
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Old 02-19-2011, 09:22 PM   #5
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installing tyvek house wrap


According to the site referenced:

Tyvec "blocks excess water from entering the wall". Excess water is moisture the is free water (liquid state) and not in vapor form. - That sure sounds like a primary moisture barrier which is used in most design standards and codes. The purpose of the primary moisture barrier is to shed water downward to an exit on the EXTERIOR.

Tyvec "allows moisture vapor to pass through the to help the drying of the wall". That means it is not a vapor barrier, but breathes, so the vapor barrier can performed as required, which is on the warm side of the insulation unless the rigid insulation is the vapor barrier.

The reference citation is really non-technical description written for people other than engineers, architects and even code officials.

Just a side note: - there is not such thing as a vapor barrier, but in our loose building codes it is set at an arbitrary level of perms. As an example, the fraction of a mill can reject a material, but there is no reference for the nails penetrations, edge sealing or even uniformity of the material thickness. - It is really just a design concept with a short-hand definition of real performance.

Dick
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Old 02-24-2011, 07:00 PM   #6
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installing tyvek house wrap


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Originally Posted by GBR in WA View Post
Welcome to the forum!

1. What type of siding will go on the outside?

2. Type of insulation in cavity?

3. Type of sheathing?

4. Location?

Gary
wall will be covered with vynal siding
Wall has fibreglass insulation and is sheeted with 5/16 plywood.
my house is located in Saskatchewan
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Old 02-24-2011, 09:08 PM   #7
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installing tyvek house wrap


Something to think about; http://www.greenbuildingadvisor.com/...istive-barrier

Gary
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Old 02-25-2011, 08:12 AM   #8
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installing tyvek house wrap


My opinion would be to have the building wrap on the very exterior of the building. This way you can properly install the building wrap as a drainage plain also. If you are using foam, you would need to use plastic cap nails to hold the building wrap on.

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