House Wrap Under Roof Sheathing

Use in relatively dry areas.

House wrap under roof sheathing.

Plastic housewrap not perforated. Sheathing wrap under siding. Overlap horizontal seams 6 inches upper layer over lower layer. Low resistance to liquid water.

Most siding materials are not totally effective at repelling water particularly wind driven rain. Overlap vertical seams 6 12 inches. 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. Seal the bottom of the house wrap to the sheathing with caulk or tape.

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. 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. Plastic housewraps range from around 5 to over 50 perms.

Good option for all types. Tyvek has been used directly over studs where there is no sheathing although use of sheathing is a highly recommended building practice. Traditional sheathing wraps such as asphalt felt and grade d building paper used under stucco both measure about 5 perms. Extend house wrap below the mudsill for water management but also for air sealing.

When tyvek is used under sheathing it functions only as an air barrier and does not protect the sheathing as a secondary weather barrier. 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. Can trap liquid water fdrom wall leaks. House wrap is a fabric paper or board material that covers the exterior sheathing of house walls to protect the wall framing.

Overlap the layers shingle style as you go up the wall like roofing shingles. When water gets behind the siding house wrap is there to shed the water and keep it from entering the wall cavity. Sheathing wrap under siding.