WhiteCap crawl space vapor barriers have become a household name with contractors across North America. The WhiteCap Standard series of reinforced liners is what built that reputation. WhiteCap Standard comes in 12 mil and 20 mil thickness with a variety of different sized rolls to fit any job. WhiteCap Standard series heavy duty plastic sheeting gives you incredible value at some of the industry’s most competitive pricing. WhiteCap Standard is a high-strength polyethylene liner, and is cord reinforced for increased durability. The visible side of the liner is bright white in color and creates a bright, clean, seamless look when finished.