GAS BARRIERS
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.
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.
WELDABLE
Keytec 400 Extra can be welded with conventional hot air welding equipment
or alternatively sealed with Keytec double- sided tape.
SUPPLY
Supplied in easy to handle rolls with instructions to be self installed,
in pre-welded panels or to be welded by Keytec technicians.
GAS VENTILATION SYSTEMS
Keytec designs, supplies and installs a variety of venting systems tailored
to the 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.
ACCESSORIES
Pipe penetration top hat sections, Keytec adhesive membrane (Keyflex),
(for step detail, abutment or multi-duct application) and Keyseal gas barrier
tape (double-sided) in 24 metre length rolls.
Stainless steel high quality gas venting bollards, ventilating aspirating
cowls, vent boxes, periscopic vents and adapters.
  
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