House Wrap Under Roof Sheathing

Most have high permeability and high resistance to liquid water good air barrier if taped.

House wrap under roof sheathing.

House wrap is a fabric paper or board material that covers the exterior sheathing of house walls to protect the wall framing. Seal the bottom of the house wrap to the sheathing with caulk or tape. Sheathing wrap under siding. 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.

Overlap the layers shingle style as you go up the wall like roofing shingles. Traditional sheathing wraps such as asphalt felt and grade d building paper used under stucco both measure about 5 perms. Its primary purpose is to prevent air and water leaks that may have seeped past the vinyl exterior. Overlap horizontal seams 6 inches upper layer over lower layer.

Tyvek has been used directly over studs where there is no sheathing although use of sheathing is a highly recommended building practice. Sheathing wrap under siding. When water gets behind the siding house wrap is there to shed the water and keep it from entering the wall cavity. 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.

Where you ll often see plywood used instead of osb is in roof sheathing where the risks of moisture and leaks are greater. When tyvek is used under sheathing it functions only as an air barrier and does not protect the sheathing as a secondary weather barrier. Low resistance to liquid water. Good option for all types.

Overlap vertical seams 6 12 inches. Most siding materials are not totally effective at repelling water particularly wind driven rain. 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.

Plastic housewrap not perforated. Can trap liquid water fdrom wall leaks. Extend house wrap below the mudsill for water management but also for air sealing.