The ADD Waterproofing and Radon Gas Management System was developed by a group of property preservation specialists, with over 40 years of experience in waterproofing underground structures and 20 years experience in the field of radon gas. When basements are used for living or working accommodation, making the environment dry is not the only issue to take into consideration. In order to create a safe, habitable space control measures should also be installed to deal with the potential presence of radon gas.

With an ever increasing numbers of people recognising the need to take account of radon gas contamination in basements, the idea of designing a combined solution to both these issues for use in basements was born.

The concept was patented and packaged as ADD Waterproofing in 2008 (Patent No: 2464401) and is offered by Radon Gas Systems Limited.

A nationwide network of highly-trained waterproofing specialists has been granted licenses to install the ADD Waterproofing system. These specialists have a reputation for offering premium quality workmanship and have demonstrated their skills over the years. Surveyors and designers from these specialist firms have also completed rigorous training and completed an examination prior to becoming a Radon Gas Systems Limited Licensed Installer for the ADD Waterproofing System.

The ADD Waterproofing system is only available from official Licensed Installers, who each hold a certificate indicating their status.