Building Paper
Definition and meaning of Building Paper in real estate.
Building paper is a heavy, asphalt-saturated paper applied over exterior wall sheathing and under siding to act as a protective barrier against liquid water and wind.
In more detail
This material is designed to shed water that penetrates the outer siding, preventing moisture damage to the structural wood framing. At the same time, building paper is vapor-permeable, which allows indoor water vapor to escape from inside the wall cavity, reducing the risk of mold and wood rot.
It is historically known as tar paper or felt paper and has been used in home construction for generations. While modern synthetic house wraps have become common, building paper is still widely used, particularly behind traditional stucco or brick finishes.
Key facts
| Category | Property Types & Construction |
|---|---|
| Also known as | Asphalt felt or tar paper |
| Primary function | Weather-resistive barrier |
| Key property | Water-resistant but vapor-permeable |
Before installing wood siding on a new house, the contractor staples layers of black building paper to the plywood sheathing to keep rain from reaching the structural framing.
Frequently asked questions
Is building paper the same as house wrap?
While both serve as weather-resistive barriers, building paper is traditional asphalt-impregnated paper, whereas house wrap is a modern synthetic material made of woven plastic fibers. Both perform similar functions but have different installation methods and strengths.
Can building paper be used on roofs?
Yes, heavier versions of building paper, commonly called roofing felt, are standard underlayments placed beneath shingles or metal roofing to provide extra water protection.