Sika Bentoshield Max LM

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.