Damp Proof Membrane

An impervious membrane should always be applied as a damp proof membrane above or below a ground floor slab to stop ground moisture reaching the upper surface of the floor. RIW's damp proof membranes can be applied to either a suitable blinding layer under the slab or internally to the top of the slab. Consideration should be given to applying the damp proof membrane to the top of the slab, as the installation and moisture sensitive internal finishes are protected from any residual moisture in the concrete. RIW's DPMs are compatible for use with all commonly encountered insulation materials.

RIW LAC is an effective damp proof membrane on insitu concrete slabs and has been used as such for over 90 years. This product can be used under a floating floor as well as under a screed.

RIW Flexiseal is a high performance alternative, with its colour coded quality control system and excellent flexibility making it especially suitable for modular floor construction; such as pre-cast planks or beam & block floors.

RIW Sheetseal 226 is a popular choice, as it can be applied quickly with no drying time. With a factory-controlled thickness, the material is also able to self-seal minor damage. Suspended floors e.g. ‘beam and block’ are also easily protected with RIW Sheetseal 226 due to its elasticity.

RIW Toughseal, a liquid applied epoxy coating, is suitable for use as a finished surface membrane (e.g. under raised access floors, plant rooms, bunded areas and below levelling compounds) as it has excellent adhesion to the substrate and a Class 1 Surface Spread of Flame fire rating.

RIW Cementflex is a high performance cement based waterproof coating with excellent flexibility making it especially suitable for modular floor construction; such as pre-cast planks or beam and space block floors.

RIW Cementseal, a high performance cement based waterproof coating with excellent durability and is suitable for use as a finished surface membrane e.g. plant rooms, bunded areas and below levelling compounds or other floor finishes. 

(Identify the most appropriate RIW product(s) for your specific application from the text aboveand click on the product icon on the right to access the product page for more information and downloadable data sheets).

For more information about damp proof membrane applications please contact the RIW Technical Department.