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Should DuPont™ Tyvek® be placed over or under the sheathing?

April 26, 2017Placed sheathing

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Should DuPont™ Tyvek® be placed over or under the sheathing?

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DuPont™ Tyvek® can be used either over or under sheathing. When DuPont™ Tyvek® is used under sheathing, it functions only as an air barrier and does not protect the sheathing as a secondary water barrier. DuPont™ Tyvek® has been used directly over studs where there is no sheathing, although use of sheathing is a highly recommended building practice.