House Wrap Under Roof Sheathing

When used to slow winds its job is to seal gaps and leaks in the osb panels or plywood sheathing that makes up your home s exterior walls.

House wrap under roof sheathing.

Install house wrap before doors and windows. General recommendations that usually apply to fabric type house wrap include. You can find a complete library of technical documents for the zip system at this link. Most house wraps are weather resistant barriers wrbs that aim to prevent air and moisture infiltration to the wall system while protecting the sheathing.

For instance protecto wrap flashing tape on tyvek. A house built well with wood sheathing covered with asphalt paper or plastic house wrap can perform as well as one with zip sheathing. It is literally wrapped around a building cut out around windows and doors and taped at the seams. 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.

Depending on how it s hung house wrap can either act as a moisture or wind barrier. Where you ll often see plywood used instead of osb is in roof sheathing where the risks of moisture and leaks are greater. In this post we compared barricade wrap plus tyvek homewrap homeguard house wrap certainteed certawrap and the zip system. Work from the bottom up overlapping the lower courses.

House wrap behind a building s siding is an excellent secondary defense against the weather. Hardiewrap weather barrier is installed over the sheathing beneath the exterior siding to reduce water and air infiltration. Plastic housewraps range from around 5 to over 50 perms. House wrap is a weatherization membrane which provides a protective layer under a building s siding and over the wall girts or sheathing.

Wrap the fabric around the edges of windows. I ve been using hardie siding in the texas heat for over 10 years. The other wrinkle is that when using zip sheathing very few manufactures include instructions for installation on that type of sheathing. Seal all seams with a special tape provided by the house wrap manufacturer.

The primary goal of a sheathing wrap or housewrap is to protect a building s structural components from water. The reason for this is the housewrap manufacterers instructions call out their own product not their competitors. Traditional sheathing wraps such as asphalt felt and grade d building paper used under stucco both measure about 5 perms. At the same time the sheathing wrap must be permeable enough to allow drying to the building s exterior if the framing or sheathing should get wet.

The homes i built then still look brand new today.