New VOC barrier provides flexible protection for brownfield development

The A. Proctor Group has extended its range of ground gas protection products to include Protech VOC Flex, a new and innovative solution in membrane technology, specifically to make the development of brownfield sites safer and easier.

Protech VOC Flex is a high performance six layer flexible proprietary reinforced VOC barrier suitable for use on brownfield sites that require protection from dangerous contaminants such as hydrocarbons.

Aubrey Machin, Ground Protection National Technical Sales for the Group explains the need for the new membrane,

“With the emphasis that is being placed on brownfield development, more is required from the systems that have traditionally been used for ground gas protection. We wanted to develop a new membrane that is designed specifically to meet the needs of these sites. Protech VOC Flex was designed as a Hydrocarbon and VOC membrane, as in our experience, these are typical of the type of contaminates present on many brownfield developments. However, continual testing enables us to provide not simply yet another hydrocarbon membrane, but a chemical barrier, which should be suitable against a whole range of contaminates.”

“Previously the membranes which were recommended to provide protection for buildings were derived from landfill and industrial solutions, typically HDPEs of various thickness. The main problem with these membranes is that they are incredibly difficult to work with and detail, plus the misconception that HDPEs offer complete protection to VOCs when in reality the permeation rates are quite high as indicated in CIRIA C748. Therefore the main objective was to produce a new membrane, which is highly resistant to Hydrocarbon and chemical attack, plus strong and robust enough to survive the build process highlighted in BS8485 2015*, and more importantly flexible enough to detail and install quickly and easily. Our initial projections are that it should be four times faster to install against traditional HDPEs.”

*BS8485 2015 Code of practice for the design of protective measures for methane and carbon dioxide ground gases for new buildings.