Ground gas and geomembrane specialists

Ground gas protection for housing

Gas protection for housing

Ground gas protection for housing typically comprises gas membranes combined with with a ventilation system to remove gas. This provides passive gas protection without the need for monitoring or mechanical equipment, which is ideal for housing and small industrial units. We can also supply active gas protection for larger installations or those requiring additional protection.

Gas membranes and venting

Many of the products that we use to provide barriers and venting are specially developed by us and available only from PAG. Gas membranes can be supplied in preformed sections to speed up installation on housing sites. Alternatively, we can carry out joining on site.

PAG standard ground gas protection membrane

PAGeoTechnical specialises in difficult-to-solve problems on housing sites. By looking at the site in its entirety and using combinations of single and multiple membranes and ventilation systems, many sites have been developed which would otherwise have been difficult or impossible. Please contact us early if you have such sites and we will be pleased to assist with everything from design, through planning and approvals, to managing construction.

Residential housing for sale can be designed in accordance with BS8485 OR in accordance with NHBC traffic light system. Please contact us for information.

Construction methods for ground gas protection

The method of ground gas protection depends on the type of construction of a building. Predominantly, these are ground bearing slab and suspended floors.

Ground bearing concrete slab

The slab is poured directly on to the gas barrier, below which is a venting layer of 200mm granular material, or PAG 25 vent layer, which provides the most effective venting and forms a more stable substrate.

Ventilation paths must be provided from the venting layer to atmosphere via a trench with granular fill, or air bricks

Passive gas protection for house

Suspended floors

Gas barrier is laid over the structural floor and covered with a screed. The sub-floor can be ventilated by air bricks.

Passive gas protection for house

Datasheets and brochures

Gas protection


Monarflex RAC

A robust high performance gas barrier, suitable for under slab application.

Monarflex Reflex Super

High performance gas barrier.

PAG Standard Gas Barrier

A high performance Gas Barrier, suitable for some under slab applications.


A high performance gas barrier, suitable for some under slab applications.

PAG CAB Clean Air Blanket

Active gas protection for contaminated land.

Quick links

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