I have a basement with a poured concrete floor and block walls. I also have a radon issue. Radon mitigation has been installed and is providing good evacuation of the air under the slab BUT i believe that the unsealed block walls are "leaking" enough air to bring some radon into the space. Will treating the walls with GBS seal the walls against any airflow and hence the radon that would be carried in with the Air? SAMPLE - Green Building Supply, Penetrating Concrete Sealer Concrete & Masonry Sealers

Question

I have a basement with a poured concrete floor and block walls. I also have a radon issue. Radon mitigation has been installed and is providing good evacuation of the air under the slab BUT i believe that the unsealed block walls are "leaking" enough air to bring some radon into the space. Will treating the walls with GBS seal the walls against any airflow and hence the radon that would be carried in with the Air? SAMPLE - Green Building Supply, Penetrating Concrete Sealer Concrete & Masonry Sealers

Status: Open Oct 23, 2019 - 02:15 AM

1answer

Answer

Oct 24, 2019 - 07:40 AM

Our GBS Penetrating Concrete Sealer used on concrete block will block the intrusion of moisture and air. We have no documentation to prove that this will stop Radon, but our customers have advised us they feel it is helping immensely. Concrete block is very porous and will require lots of sealer to fill the pores properly. This could require 3 or more saturating coats. One gallon usually covers 200 SF. As an insurance policy, you may wish to seal the concrete floor as well. For cracks larger than 1/16" wide, we recommend our M-1 which comes in a 10 oz caulking tube or our AFM Dynoseal which is spreadable with a trowel.