Existing basement waterproofing usually requires a type C drained cavity protection system. On this project Midland Tanking was instructed to design and install a waterproofing system to allow the creation of lower ground floor areas of two new dwellings. This was all part of a large redevelopment of an old pub.
Waterproofing system
Type C – Drained cavity protection
When designing existing basement waterproofing systems, the substrate of the building needs to be considered. This project involved the conversion of an old pub.
The existing basement in the old pub was traditional brick walls and concrete floor, allowing for a straight forward design & installation. According to BS8102:2009, the most reliable form of existing basement waterproofing is a Type C – drained cavity protection system.
All walls and the floor were lined with a cavity drainage membrane (CDM). These membranes were linked to sump chambers via a combination of preformed perimeter channels and underground pipes with inlets cut off at floor level. Within the sump are two pumps and a high-level alarm. This system is designed to catch any water, direct it to the sump and discharge it automatically. Flushing and maintenance points were installed to allow future servicing of the system.
The waterproofing in the existing basement was designed by Structural Surveyors in Structural Waterproofing (CSSW) in accordance with BS8102:2009
All waterproofing materials were supplied by Triton Systems Ltd
