House Wrap
Definition and meaning of House Wrap in real estate.
House wrap is a synthetic, weather-resistant barrier installed over a building's exterior sheathing before the siding is applied. It prevents liquid water from entering the wall cavity while allowing water vapor to escape, protecting the structure from wood rot and mold.
In more detail
This material is crucial for managing moisture in residential construction, as it functions like a one-way protective membrane. While it keeps external rain and wind from penetrating the walls, its breathable design allows moisture from inside the home to evaporate outward. It also acts as an air barrier, reducing drafts and helping the home retain heated or cooled air.
Proper installation is key, requiring the wrap to be overlapped at the seams and sealed with specialized tape to prevent leaks. Damaged or poorly installed house wrap can trap moisture, leading to structural damage that can be expensive to repair.
Key facts
| Category | Property Types & Construction |
|---|---|
| Material type | Spun-bonded polyolefin or synthetic fabric |
| Primary purpose | Moisture protection and air infiltration reduction |
| Installed before | Exterior siding or veneer cladding |
During the construction of a new home, the builder covers the plywood sheathing with house wrap to keep the wood dry before installing the vinyl siding.
Frequently asked questions
Is house wrap the same as vapor barrier?
No, house wrap is breathable to let water vapor escape, whereas a vapor barrier is designed to completely block moisture transmission and is typically installed on the warm side of the insulation.
Can house wrap be left exposed to the sun?
House wrap can resist solar damage for a limited time, usually a few months, but it should be covered with siding promptly to prevent degradation from ultraviolet rays.