Sika BentoShield Max LM is a factory pre-hydrated, needle-punched polyethylene (PE) flexible membrane that uses the unique self-healing properties of sodium bentonite clay to provide robust, long-term waterproofing for below-ground structures. The membrane is fully bonded to the concrete structure through a combination of the bentonite clay activating in contact with water and the PE fleece integrating with the concrete. The pre-hydration of the bentonite means it activates and seals immediately without requiring the ingress of groundwater — providing waterproofing protection from day one. Sika BentoShield Max LM is suitable for basement slabs, walls, and retaining structures, and can act as a barrier to radon and ground gases when correctly installed. It is a Type A external barrier system in accordance with BS 8102:2009. Benefits Self-healing — pre-hydrated sodium bentonite at ≥5,000 g/m² swells on contact with water to automatically re-seal minor punctures and damage up to 2 mm in size Qualified waterproofing tanking membrane in accordance with BS8102:2022 Water tightness of the laps tested to BS EN 1928 Designed to offer protection in areas subject to changing geological conditions such as flood plains, areas of soil settlement and brown field constructions. An effective barrier against ground water in saline environments. Easy to install, no primers or protection boards required. Can be applied in temperatures below 0°C Can be applied during conditions of high humidity 0.3mm PE backing gives effective Radon barrier in accordance with BRE211. Good to know Can be placed within the formwork. Can be used in below structural reinforced concrete slabs and below ground reinforced concrete structures. Sika® BentoShield® Max LM should only be applied after the successful preparation of the substrate is completed When placing Sika® BentoShield® Max LM inside the formwork, the formwork must be removable & not the stay in-situ variety. Sika® BentoShield® Max LM products are not designed to be installed over ice or in standing water. Should the ground water contain strong acids, alkalies, or has a conductivity of 2,500 μmhos/cm or greater, water samples should be tested for compatibility. Rolls may compress slightly during storage. Membrane can be shaken once unrolled to return to their full length. Always check the BentoShield Method Statement - available in the Technical Information section on this page.
