To fulfil the requirements of BS8102:2022 and BS 8485:2015+A1:2019 a strategy to develop a specification which combines structural waterproofing and ground gas protection were required for this refurbishment project.

The project involved creating additional living space to an existing mid terrace Victorian property in W12.  The site of the property, whilst not being located on contaminated land was identified as being potentially at risk, it was near what is classed as contaminated land (an old brick yard).

To satisfy Building Control requirements gas protection measures were required to meet BS 8485:2015+A1:2019.

Delta and MemTech Registered Installers, Renlon were called upon to offer a solution to this property, taking into consideration the proximity of The New River and the risk from ground gases. The proposed remedial strategy to be adopted at the site was one of managing the pathway between the source of contamination and the critical receptors on-site.

The project was to convert a former vehicle maintenance and repair workshop into a dwelling. Ground tests did not reveal any significant level of Volatile organic compounds (VOC’s) in the soil but the local authority required a gas membrane to be installed and independently verified.

The scope of the project was to provide a gas protection system and waterproofing solution for four new build properties in Barnet, North London.

The four new residential (semi-detached and detached) houses were built on an existing brownfield site. Low levels of methane were detected on site during the site investigation and gas monitoring of the site.