Plastic underlayment/subfloor, also known as dimplified plastic. This is to lay under flooring to create an air gap and vapor barrier for high moisture areas. We used it under laminate and had a left over roll.
You are only getting one (1) roll, unopened and sealed. One roll covers 328 sq ft. It is extremely easy to install.
From the manufacturer:
DELTA®-FL Subfloor ROLL 4' 9" x 68' 6" (328 sqft)
DELTA®-FL is a uniquely dimpled, heavy-duty gray plastic membrane that keeps you and your family warm and comfortable in your basement, or any room in the house with a concrete, slab-on-grade floor. The membrane is installed with its dimples down to create a 5/16-inch thick air space above the slab, and can be covered with a plywood subfloor and topped off with carpet or flooring systems. Great when used for basement subfloor!
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