House Wrap Under Roof Sheathing

Tyvek has been used directly over studs where there is no sheathing although use of sheathing is a highly recommended building practice.

House wrap under roof sheathing. Can trap liquid water fdrom wall leaks. Overlap horizontal seams 6 inches upper layer over lower layer. Sheathing wrap under siding. Most have high permeability and high resistance to liquid water good air barrier if taped.

Plastic housewrap not perforated. Seal the bottom of the house wrap to the sheathing with caulk or tape. Its primary purpose is to prevent air and water leaks that may have seeped past the vinyl exterior. In theory the sheathing on your home should never get wet as long as the proper preparations are made when siding the home flashing house wrap j channel caulk etc.

Plastic housewraps range from around 5 to over 50 perms. When water gets behind the siding house wrap is there to shed the water and keep it from entering the wall cavity. Overlap the layers shingle style as you go up the wall like roofing shingles. Extend house wrap below the mudsill for water management but also for air sealing.

Overlap vertical seams 6 12 inches. To sum it up house wrap is a lightweight paper like material that is most often used to completely cover the house directly on top of the sheathing and behind the vinyl siding. However if you re interested a residing project offers the perfect time to examine your home s weather barrier and exterior insulation and improve it if need be. When tyvek is used under sheathing it functions only as an air barrier and does not protect the sheathing as a secondary weather barrier.

In general a sheathing wrap should have a perm rating of at least 5 to enable walls to dry out in a reasonable period of time should they get wet. Where you ll often see plywood used instead of osb is in roof sheathing where the risks of moisture and leaks are greater. Low resistance to liquid water. Traditional sheathing wraps such as asphalt felt and grade d building paper used under stucco both measure about 5 perms.

Good option for all types. Sheathing wrap under siding. House wrap is a fabric paper or board material that covers the exterior sheathing of house walls to protect the wall framing.