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Don't let it touch.....

Posted by Mongoose on November 17th, 1999 04:37 PM
In reply to House Wrap and water vapor by Mark on November 15th, 1999 11:04 AM [Go to top of thread]

Mark, whatever you use, don't let the cedar siding touch the Tyvek or the Red Rosin.I've done research because I'm siding my house with western red cedar shingles. Apparently there is a chemical reaction between the tannic acid in the cedar and the Tyvek which causes both the wood and the wrap to decay prematurely.I've installed my shingles on strips so the have plenty of ventilation between them and the Tyvek wrap.

The moisture not passing through the Tyvek is not and issue.Tyvek is designed as a wind stop type barrier, not a vapor barrier.It will let water vapor through but it prevents air infiltration caused by winds.

good luck


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