House Wrap Under Roof Sheathing

Low resistance to liquid water.

House wrap under roof sheathing.

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. Plastic housewrap not perforated. 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.

Good option for all types. Most siding materials are not totally effective at repelling water particularly wind driven rain. Overlap horizontal seams 6 inches upper layer over lower layer. 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.

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

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. 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. Where you ll often see plywood used instead of osb is in roof sheathing where the risks of moisture and leaks are greater. House wrap is a fabric paper or board material that covers the exterior sheathing of house walls to protect the wall framing.

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. Use in relatively dry areas. When tyvek is used under sheathing it functions only as an air barrier and does not protect the sheathing as a secondary weather barrier.

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. Sheathing wrap under siding.