Is 12 mil thick enough for a crawl space vapor barrier?

Yes. 12 mil is about double the common 6 mil liner and is a standard choice for encapsulation and radon work where durability matters. Thicker liners resist tears and punctures better during installation and inspections.

How much area does a 10 x 100 foot roll cover?

A 10 by 100 foot roll covers 1,000 square feet. That is enough for many average crawl spaces, but measure your footprint and add overlap at walls and seams before ordering.

Which side faces up, black or white?

The white side faces up into the crawl space to reflect light and brighten the work area. The black side faces down against the soil to block light and limit microbial growth.

Can it be used for radon mitigation?

Yes. The description lists radon gas mitigation systems as an intended use. It must be sealed at seams and edges with compatible tape and a radon system installed by a qualified contractor.

Does it need tape or fasteners?

Yes. A vapor barrier only performs when seams and wall edges are sealed. Plan on vapor-barrier tape and mechanical fastening at the foundation walls.

Is it better than a 6 mil liner?

It is stronger and more puncture-resistant than 6 mil, which helps in high-traffic or rough-soil crawl spaces. A 6 mil liner is lighter and easier to handle for light-duty jobs.