The use of factory formed details is always recommended in line with good building practice. If the puncture of the membrane system by service entries or steelworks cannot be avoided, these areas should be sealed with propriety factory formed units.

Alderprufe Holdfast

A tying system for fixing gas protective membrane to the underside of concrete slabs when future subsidence of the prepared ground is anticipated.

The concrete displacing itself around 'T' bar sections. In the event of ground subsidence, the 'T' sections are fixed to ensure the membrane remains fixed with no possibility of failure due to rupture.

Alderseal Gastite Mastic

Developed for sealing around cable ducts, conduits, service pipe entries and reinforcing bars against gas and water ingress.

It is possible for gas and water to track up and along cable, duct and steel bar penetrations of the membrane. Alderseal Gastite Mastic has been developed to solve the problems of sealed collar systems on small diameter penetration.

It has British Telecom type approval and meets the requirements of British Gas for sealing services.