Keytec 400

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

A Keytec 400 Extra gas barrier 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 its 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 on any gas barrier membrane or gas barrier accessories contact us.