VaporBlock Plus 20 is a heavy duty plastic liner that is 20 mils thick.- This Poly Sheeting Gas and Mold Blocker is a 7 layer co-extruded barrier AKA Radon Plastic Vapor Retarder

VaporBlock Plus 20 plastic sheeting is a 20 mil polyethylene, high performance vapor barrier intended for under-slab applications where soil-borne gases like radon are a concern. VaporBlock Plus 20 (radon plastic) is 50 times less permeable than typical high-performance polyethylene vapor retarders. This is due to its tight cell structure.Superior unmatched impact strength for both under-slab and vertical wall applications.
VaporBlock Plus 20 is one of the most effective underslab vapor
barriers in the building industry today far exceeding ASTM E-
1745 Class A (Plastic Water Vapor Retarders Used in Contact with Soil
or Granular Fill Under Concrete Slabs). The 20 mil thickness is designed to meet the most stringent requirements. Vapor Block Plus 20 is a work horse when it comes to protecting your flooring and other moisture sensitive furnishings in your home or office building by greatly reducing condensation, mold and degradation.
VaporBlock Plus 20 is produced within the strict guidelines of our
ISO 9001:2000 Certied Management System.
This gas blocker is much less expensive than comparable products. A 10-foot-by-150-foot roll costs about $525. For radon blocking, seams should be sealed with a special foil-backed tape (VBP4VB Plus Tape) that costs $32 per 4-inch-by-150-foot roll.
Click here for VaporBlock 20+ details
Click here for Installation Guide
Click here for VIDEO Facts about Radon Gas in Your Home
VaporBlock Plus 20 roll size: 10' x 150'