The CM20 Cavity Drain Membrane is a 20mm studded membrane, suitable for Type C waterproofing and delivering a grade 3 environment to BS8102:2009 and NHBC Chapter 5.4. CM20 is the highest drainage capacity membrane in the Wykamol Waterproofing range.
Wykamol CM20 Waterproofing Membrane is BBA-approved as suitable for type ‘C’ Cavity Drain Membrane Systems in accordance with BS8102 and now includes our high-vis yellow membrane.
This waterproofing membrane is the highest drainage capacity membrane in the CM range, giving a void of 14 litres/m². Suitable for use on floors and walls in very wet situations, or where a large stud height is needed to maximise insulation values.
This membrane is available in 2 m width as 20 m rolls or 10 m rolls, the latter being light enough for individual manual handling.
CM20 creates a dry, habitable living space in areas previously suffering from damp or wet conditions.