Lift Pit
(Identify the most appropriate RIW product(s) for your specific application from the text below and click on the product icon on the right to access the product page for more information and downloadable data sheets).
Lift pits are notorious for leaking. They are usually below the floor slab level and often below the subsoil drainage system, therefore they can be subject to hydrostatic pressure. They are usually small, externally tanked in difficult, often wet and confined working conditions. It is good practice to incorporate a small sump or low point in the base of the pit from which water can be pumped in the event of water ingress.
RIW LAC is a bitumen solution usually applied to the external face of concrete pits in conjunction with RIW Double Drain and a sub-soil drainage system. A high level of workmanship is essential to ensure all corners and angles are reinforced and sealed with RIW Sheetseal 226.
RIW Flexiseal is a flexible polyurethane membrane with colour-coded coats for quality control. Additional reinforcing strips and corner fillets are not necessary, simplifying the application, which is therefore less likely to fail due to inadequate workmanship. RIW Flexiseal is an ideal choice of membrane for masonry construction. RIW Protection Boards or RIW Double Drain should be used to prevent damage from backfill operations.
RIW Toughseal is a polymer modified epoxy membrane that can be applied to the internal faces of a lift pit to enhance the performance of watertight concrete by incorporating an oil resistant damp proof membrane. RIW Toughseal is available in Grey, which improves the level of lighting for lift maintenance.
RIW Structureseal is a sodium bentonite composite sheet that is the ideal choice to externally tank a concrete lift pit because its self-healing qualities are activated in conjunction with ground water. It is simple to install and is usually laid into the excavated ground or against sacrificial shutters. Protection boards are not necessary and the product can be used in conjunction with other RIW membranes when required. | 
