Longseal GR is an advanced waterproof membrane capable of resisting the passage of methane gas. The membrane is manufactured from an aluminium and cross-oriented HDPE film laminated to a layer of rubber modified bitumen adhesive. Independent tests show that this advanced backing film and adhesive layer provide good technical performance for the suppression of methane and radon gases. The membrane offers good conformability for site application, but should be covered as soon as possible after installation, with a cementitious screed or similar protective layer. The aggressive adhesive will bond at temperatures as low as 5° C, but are resistant to melting and dripping at up to 80° C.

Recommended use

• Internal and external tanking of underground structures
• Land-fill sites and specific geographical locations
• Car parks and retaining walls
• Subways and lift shafts