Gas Barrier
Keytec 400 Extra
Keytec 400 Extra Barrier is an aluminium foil cored membrane, encapsulated
in polyethylene with a polyester scrim reinforcement. These laminated
films combine to form a membrane that protects against Methane (CH4),
Carbon Dioxide (CO2) and Radon gases. An additional benefit is the partial
plastic memory, which allows the membrane to be used in three-dimensional
detailing of building structures where conventional gas membranes will
not profile.
Trigger levels for a gas barrier arise where the following readings are
obtained, Methane 1 % by volume in air (5% being the lowest explosive
level – L.E.L), Carbon dioxide 1.5% by volume in air and radon
in designated areas where the Becquerel’s level is above 200.
Download Spec sheet for Keytec 400 Extra »
Compliance
Keytec 400 Extra Complies with UK building regulations for damp proof membranes (DPM) and damp proof course (DPC) membranes.Transmission
Low Gas permeability 0.005 cm ²/hm ²/atm methane transmission rates tested by the British Research Establishment. Radon improvement factor 500-1.Installation
Keytec 400 Extra can be welded with conventional hot air welding equipment by Keytec Technicians or alternatively sealed with Keyseal.Gas Ventilation Systems
Keytec designs, supplies and installs a variety of venting systems tailored to gas concentrations, flow rates, structural design of a building and it's architectural aesthetics.The final composition of the venting system is dependent on these critical factors. They can be a combination of perforated pipes, capsulated or polystyrene void formers to the foundations with the gas being vented through vent stacks, aspiring cowls, vent boxes, vent bollards, gravel perimeter trenches, or periscopic vents and airbrick to the atmosphere.
For design assistance and information advice contact us.
