Fully Welded Gas Resistant Membrane Installation

 

The membrane barrier is the secondary element in a gas protection system, should the gas dispersal system should malfunction the gas barrier with prevent ingress of ground bourne gases into the structure until such time that the gas dispersal system has undergone a complete overhaul. In no instance should a gas barrier be used in isolation, as this can lead to a build of gas with potentially explosive results. Current guidance states survivability of the membrane during and post installation is a major consideration, therefore it is essential to ensure your gas resistant barrier is fit for purpose and can withstand the rigours of installation. It is also prudent to ensure that all installations are carried out in accordance to a CQA regime.

 

Large bay production to minimise in situ joints

 

Purpose built dispensing equipment

 

Fully welded installations with 110v PAT tested twin wedge welding equipment

 

On-site testing as part of comprehensive CQA regime

 
The diagram to the left clearly shows the pocket formed between the welds of a twin wedge welding device. The pocket (labelled E ) is sealed at both ends and subject to an air pressure test to ensure entegrity of the twin wedge weld.
 

It is essential that the gas barrier maintains complete integrity over the full plan area of the structure undergoing gas protection. The picture to the left shows factory formed column cloaks and gas grade dpc bridging the cavity between internal and external walls. The column cloaks are sealed to the steel columns and then heat sealed to the adjacent gas grade dpc and gas barrier. Likewise the gas grade dpc is heat sealed to the gas barrier. The installation of a gas grade dpc is essential in the prevention of creating a slip plane, as commonly occurs when gas resistant barriers are laid through walls and across cavities during construction.