House Wrap Under Roof Sheathing

Can trap liquid water fdrom wall leaks.

House wrap under roof sheathing.

Its primary purpose is to prevent air and water leaks that may have seeped past the vinyl exterior. Tyvek has been used directly over studs where there is no sheathing although use of sheathing is a highly recommended building practice. Extend house wrap below the mudsill for water management but also for air sealing. Most have high permeability and high resistance to liquid water good air barrier if taped.

When tyvek is used under sheathing it functions only as an air barrier and does not protect the sheathing as a secondary weather barrier. House wrap is a fabric paper or board material that covers the exterior sheathing of house walls to protect the wall framing. Good option for all types. When water gets behind the siding house wrap is there to shed the water and keep it from entering the wall cavity.

Where you ll often see plywood used instead of osb is in roof sheathing where the risks of moisture and leaks are greater. 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. Sheathing wrap under siding. In the end the decision to install house wrap under your siding is a personal one that you should make after discussing it with your contractor.

Low resistance to liquid water. Most siding materials are not totally effective at repelling water particularly wind driven rain. Traditional sheathing wraps such as asphalt felt and grade d building paper used under stucco both measure about 5 perms. Overlap vertical seams 6 12 inches.

Plastic housewraps range from around 5 to over 50 perms. 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. Overlap the layers shingle style as you go up the wall like roofing shingles. Overlap horizontal seams 6 inches upper layer over lower layer.

Plastic housewrap not perforated. 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. Sheathing wrap under siding.