What is a 'Grade 3' basement environment?

Defined by BS 8102, a Grade 3 environment is a 'dry environment' with no water ingress and humidity control, suitable for residential living, offices, or leisure. To achieve Grade 3, the standard typically recommends a 'combined protection' approach—using two forms of waterproofing (e.g., Type A Tanking + Type C Cavity Drain) to provide a failsafe. MPS specializes in designing systems to meet this rigorous habitable standard.