Gas Membranes aren't always a gas!

Gas membranes are becoming a common feature in buildings. Increasing environment standards, often aimed to prevent chronic health problems in vulnerable people, driven by EU legislation are requiring greater control of ground gas pollution of air within a building.

There are various types of membrane designed to control different gases ranging from Radon to hydrocarbons. Many membranes perform a dual function in providing a damp proof membrane. Our contamination engineers are, however, finding common problems with membranes being installed by developers and builders. Planning Conditions normally require that the local authority approve the membrane material and that it is validated after installation.
We have come across a number of instances where incorrect membranes have been supplied either through ignorance of a non-technical salesman and/or the supplier not being provided with all the necessary information. In the current economic climate there is pressure to save every penny on materials and decisions are often being made solely on price comparison. The savings will however be overwhelmed by remedial costs if the incorrect membranes are installed. Common problems are also arising because of poor installation with issues such as;
• Incompatibility or incorrect materials being chosen for damp proof courses.
• Materials not being lapped and sealed correctly.
• Membranes bridging internal corners such that they are placed in tension when concrete is placed.
• Failure to properly clean the working area and bonding surfaces before installing the membrane, tapes and adhesives.
• Poor positioning of SVP.s and service entries such that gas proof seal are difficult to achieve around their perimeter.
If you require advice and assistance regarding gas membranes contact Gary Clarke in our Chorley Office.