FORZAFLEX BASE Torch-On Sheet Membrane 3mm 1m x 10m

• Roof waterproofing systems, as the base or intermediate layer beneath a cap sheet
• Podiums and plaza decks beneath protection layers
• Balconies and terraces beneath tiles, screeds or pavers
• Retaining walls, positive side, beneath protection and drainage layers
• Below-ground foundations and structures
• Lift pits and wet basements
• Intermediate ply in engineered multi-layer torch-applied build-ups

Surface suitability

• Concrete (fully cured minimum 28 days, Concrete Surface Profile 3-6, dry and sound, blowholes and defects repaired, primed with FORZAPRIME)
• Cement render and screed (fully cured, sound and non-friable, dry at the time of priming, primed with FORZAPRIME)
• Masonry and blockwork (sound, joints struck flush and made good, primed with FORZAPRIME)
• Metal (rigid, clean, free of oil, oxide and mill scale, all laps and fixings secure, primed before membrane installation)
• Existing bituminous membranes (only where sound, well adhered and compatible, and only with written FORSPEC approval following a site assessment)
• Timber and combustible substrates (torch application direct to a combustible substrate is prohibited; a non-combustible overlay board must be installed first)

Not a finished surface. FORZAFLEX BASE 3mm must be overlaid with a cap sheet, protection board, screed or finishing system and must never be left permanently exposed to UV. Classified CLASS I, low extensibility; where the design requires a Class II or Class III membrane for movement accommodation, specify a higher-class FORSPEC membrane or design the movement detail accordingly. Torch application direct to combustible substrates is PROHIBITED; a non-combustible overlay board must be installed first. Torch-applied work is hot work and must not proceed without a hot work permit, a fire watch and the fire safety measures in the TDS. Do not torch onto wet, damp, green or uncured substrates, or onto wet or uncured primer. Do not overheat; excessive heat degrades the bitumen and damages the polyester reinforcement, and the damage is not visible from the surface. Insufficient heat produces a cold bond that looks acceptable and is not adhered. No cold joints, fish-mouths or open seams are permitted at any lap. Do not install in rain, on a wet surface, or in wind conditions that prevent control of the torch flame. Not compatible in direct contact with polystyrene insulation, PVC membranes or plasticised sheet materials without an approved separation layer. Bitumen fume is classified as a suspected carcinogen. Poor surface preparation will result in adhesion failure and voids the warranty. Application must be carried out by trained and experienced waterproofing applicators.