How To Use Tar Paper As A Vapor Barrier

Tar paper is a roofing material that is made of asphalt and fiberglass paper. It is used to waterproof roofs and as a vapor barrier in walls and ceilings. Tar paper can be installed over sheathing or under sheathing, depending on the desired results. When used as a vapor barrier, tar paper should be lapped at least 6 inches and taped or stapled every 6 inches.

How To Use Tar Paper As A Vapor Barrier

Tar paper is a heavy paper that is coated with tar. It is used as roofing material and as a vapor barrier in construction. Tar paper can be used to line the inside of walls and ceilings before the installation of drywall to prevent moisture from passing through the walls and causing mold or rot. It can also be used under flooring to prevent moisture from seeping up through the floor.

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  • Measure the area to be covered and purchase enough tar paper to cover it. 2.lay the tar paper down on the floor and smooth it out. 3. if you are using it to cover a crawl space, make

-Tar paper can be used as a vapor barrier by installing it between the insulation and the exterior sheathing of a building. -If installing tar paper as a vapor barrier, make sure to overlap the seams by six inches and to staple the seams well. – also, make sure that the tar paper is installed in such a way that it will not be punctured or damaged by moisture.

Frequently Asked Questions

How Do I Make A Homemade Vapor Barrier?

There are a few ways to make a homemade vapor barrier. One way is to use a plastic sheeting such as polyethylene. Another way is to use aluminum foil.

Is Tar Paper Breathable?

Tar paper is not breathable and should not be used as a roofing material.

What Materials Would Make A Good Vapor Barrier?

Materials that would make a good vapor barrier are materials that are airtight and watertight. Some common materials that can be used as a vapor barrier are plastic sheeting, aluminum foil, and rubber membrane.


Tar paper is an affordable and effective way to reduce moisture infiltration and protect a building from water damage. It can be used on the exterior of a structure as a flashing material, or on the interior as a vapor barrier. When used as a vapor barrier, tar paper should be overlapped by at least 6 inches and sealed with caulking or tape.

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