Damp Proofing and Tanking

Damp proof course, membrane, tanking and foil tape: the full damp-defence kit

Damp is expensive when it goes wrong: mould, rotten timbers, ruined plaster, insurance headaches. Building it out properly the first time costs a fraction of the fix. This collection covers the four workhorse products for keeping damp where it belongs, outside the building.

About this range

What's in this collection

  • Capital Valley DPC Rolls (Damp Proof Course). The flexible polymer strip that goes in mortar joints, at the base of walls and around openings, to block rising damp. Available in the standard trade widths (100mm, 150mm, 225mm, 300mm, 450mm) to match the wall thickness. Rolled at 30m lengths for full-run installs without joins.
  • Damp Proof Membrane (DPM). Heavy-gauge polythene sheeting for under-slab floor installs, oversite protection and vapour control. Black polythene, 1200 gauge / 300 micron standard trade weight, in 4m×25m and 4m×12.5m roll sizes.
  • CT1 BW1 Tanking Kit. One-part waterproofing membrane for wet rooms, bathrooms, basements and below-ground brickwork. TRIBRID® polymer tech, anti-bacterial, applied by brush or roller, with no tape, mesh or primer. The pro's choice for internal tanking jobs. Not sure how much you need? Read how much BW1 do I need.
  • Aluminium Foil Tape. Reflective self-adhesive tape for sealing DPM joints, taping vapour barriers, sealing service penetrations, and repairing damp-proofing damage. Also handles insulation joints and ductwork.

DPC vs DPM: the difference that matters

Trade buyers often mix these up. DPC (Damp Proof Course) goes in walls, laid in a mortar joint to block moisture wicking up from the ground into brickwork. DPM (Damp Proof Membrane) goes under floors, laid over the oversite/hardcore before the slab is poured, blocking rising damp through the floor. Most builds need both. Tanking is a third job: waterproofing the walls and floor of a shower or wet room before you tile.

Why buy damp-proofing kit from BHD

  • Trade brands, trade prices. Capital Valley for DPC/DPM, CT1 for tanking, all at trade rates.
  • Full-run roll sizes. 30m DPC and 4m×25m DPM rolls mean fewer joints, faster installs.
  • Free UK mainland delivery over £120. A tub of BW1 or a DPM roll tips most orders past the threshold on its own.
  • Click & Collect from Gorslas. Call ahead on 01269 267030.

Not sure which gauge, width or grade for your job? Call Steve on 01269 267030 for quick advice and the correct spec first time.