Independent Gas Protection Consultants

Below-ground gas protection refers to systems designed to prevent harmful gases—such as methane, carbon dioxide, and radon—from entering buildings through foundations and substructures. Protection typically involves gas-resistant membranes, ventilation layers, and monitoring provisions specified to BS8485+A1.

Gas protection is required when ground investigation reports identify the presence of ground gases, contaminated land, or radon risk zones. Building control will not approve developments on affected sites without appropriate protection measures in place, regardless of building use or size.

BS8485+A1 is the British Standard for the design of protective measures for buildings against hazardous ground gases. It provides guidance on risk assessment, system selection, installation requirements, and verification testing to ensure occupant safety and regulatory compliance.

Retrofitting gas protection is extremely difficult and costly once a building is complete. Membranes should be installed during foundation works and integrated with structural elements. This is why early-stage design input and independent verification during construction are critical.

Contractors and product manufacturers have commercial interests in specific systems. As independent consultants, we assess your site objectively and specify the most effective solution—not the most profitable one for a supplier.