New Build Basement, Chelmsford

Not satisfied with the original specification, CCL worked closely with J J Building Services and their client to develop an appropriate waterproofing strategy for their form of construction. CCL re-designed the waterproofing solution to combine the external waterproofing and internal cavity drain systems and provide two lines of defence against water ingress. GCP- Applied Technologies Preprufe 160R plus was pre-applied to the concrete

slab. GCP Preprufe 800PA was installed to the external face of blockwork retaining walls and these were further protected with GCP Hydroduct

220 protective/drainage sheet.

GCP Bituthene Liquid membrane was applied to the top of retaining walls, terminating at DPC level, to completely seal the system. GCP Hydroduct CF08 fully maintainable internal water management system was applied to the inside face of

walls prior to GCP Hydroduct CF perimeter drainage channel being applied to wall/floor junctions, including inspection ports. This ensured the channels could be maintained efficiently. GCP Hydroduct CF08 cavity drain membrane was then installed across the slab, on top of 50mm thick Newton Fibran XPS-500C extruded polystyrene insulation. This was sealed at wall/floor junctions with GCP Hydroduct strip. The internal cavity drain system linked into two cavity drain pumped sump chambers with battery back-up system and high-level water alarms.