Basement Waterproofing

Cast Contracting Ltd (CCL) is one of the nation’s leading basement waterproofing contractors, working across the entire UK. It specialises in the design, supply and installation of all major basement waterproofing systems, including:

As specialists in the waterproofing market, CCL closely follow all the latest industry standards and regulations and keep abreast of any changes that may transpire; in particular, BS8102:2022 Code of practice for ‘Protection of below ground structures against water ingress’.

This document clearly sets out waterproofing principles, the different environmental grades, and types of waterproofing available, and provides guidance on the which strategy should be considered depending on the level of risk on the particular site/project in question. This will be dependent on various and different sets of criteria. For example, ground conditions including water table classification and intended use of the structure and anticipated defects that could occur.

Within BS8102 table 2 classifies the different grades of waterproofing protection available, including performance definition of each. This is split between four grades: Grade 1a is the lowest grade whereby seepage and damp areas from both internal and external sources are tolerable, where this does not impact on the proposed use of below ground structure. 1B is similar but allows no seepage.  Grades 2 and 3 are similar however the main difference being the internal ventilation.  Although no seepage is acceptable with Grade 2 damp areas are tolerable as a result of internal sources e.g. internal air moisture/condensation.  Grade 3 states no water ingress or damp areas are tolerable and ventilation, dehumidification or air conditioning would be necessary; appropriate to the intended use.