How Spray Foam Insulation Mitigates Radon Risk

Originally published by: Building EnclosuresFebruary 8, 2019

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Demilec Inc. announced their Heatlok HFO High Lift and Heatlok HFO Pro are now radon gas resistant and can be used in place of a conventional polyurethane membrane barrier to mitigate risk of radon incursion.

Most modern building regulations require all foundation seams and breaches to be sealed to prevent the incursion of radon, an invisible, odorless, radioactive gas and America’s second most common source of lung cancer.

Heatlok HFO is sprayed on substrate before a basement floor is poured. A single pass can seal wall and floor seams, as well as the space around utility fittings such as floor drains, sewer lines, and electrical passages. Heatlok HFO is an ICC compliant air barrier, sealing gas as well as, or better than, industry standard products.

According to Demilec, Heatlok HFO is also 11 times more efficient than the conventional polyurethane membrane used to seal against radon. In late 2018, that thermal efficiency earned Heatlok HFO the Center for the Polyurethane Industry’s (CPI) coveted Innovation Award. Heatlok HFO High Lift is rated at an R-value of 7.5/inch, while Heatlok HFO Pro, designed for commercial and industrial applications, has an R-value of 7.4/inch.

Demilec also cites Heatlok HFO’s environmentally responsible composition as a benefit, as it is composed of 12.5% post-consumer waste. To date, Demilec has recycled more than 400 million plastic bottles to manufacture their spray foam products. Heatlok HFO generates no jobsite trash and is sprayed from reusable containers.

“Spraying Heatlok HFO under slab in basement serves two distinct purposes in the building envelope. It provides thermal insulation in an area which can be the coldest part of the home, and it helps prevent carcinogenic radon gas from entering the living space. All done without having to tape down and seal polyethylene sheeting,” says Douglas Brady, Vice President of Product Management and Technology.