Plyload GR

High Performance Gas Resistant DPC

Plyload GR provides protection against the ingress of gases when sealed to both the slab membrane and DPC or cavity tray system.

Two examples of a passive (on the left) and an active system
(on the right) where the underfloor is vented

• Conforms to the current requirements for use as part of a gas resistant membrane system.

• Can be used as part of a gas protection scheme for either a passive, or active system.

• Factory welded preformed units i.e. pipe penetrations, corners, stop ends and changes of level.

The properties of landfill gases are principally determined by the presence of Methane and Carbon Dioxide and any air that these gases are mixed with. The migration of these gases, as a result of diffusion and pressure flow, have increased in recent years, and present a risk to both health and safety in both new and existing buildings. Radon or other gases can enter buildings by airflow from the underlying ground.

There are two methods for sealing against these, a passive system and an active system. The passive system is normally achieved by increasing the airtightness of the damp protection within the floors and walls. The active system requires the provision of a powered extraction system by means of an integral fan and must be used where Methane is present. Landfill gas can enter buildings through gaps around service pipes, cracks in walls below ground and floor slabs, construction joints and cavity walls.

Plyload GR, when installed correctly, is completely airtight. Uniquely Plyload GR itself is available either in rolls to provide a horizontal, vertical or stepped gas resistant dpc or in either pre-formed or bespoke shapes to suit any shape or profile. In areas where a significant concentration of Radon is present, sufficient protection can be provided by a well installed damp-proof membrane linked to the damp proof course or sealed to a cavity tray system. Dwellings in areas where higher Radon protection is required should be supplemented by the provision of sub floor ventilation or depressurisation.

Plyload GR provides protection against the ingress of gases when sealed to both the slab membrane and through he cavity. The use of factory welded preformed units i.e. pipe penetrations, corners, stop ends and changes of level must be used as part of a gas protection scheme for either a passive, or active system. Plyload GR conforms to the current BRE requirements for use as part of a gas resistant membrane system.