Drained Cavity System ~ this method of waterproofing basements
can be used for both new and refurbishment work. The basic
concept is very simple in that it accepts that a small amount of
water seepage is possible through a monolithic concrete wall and
the best method of dealing with such moisture is to collect it and
drain it away. This is achieved by building an inner non-load bearing
wall to form a cavity which is joined to a floor composed of
special triangular tiles laid to falls which enables the moisture to
drain away to a sump from which it is either discharged direct or
pumped into the surface water drainage system. The inner wall
should be relatively vapour tight or alternatively the cavity should
be ventilated.Waterproofing Basements