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External Waterproofing

Structures that are earth retaining can be damaged by moisture penetration from the outside or by the ground water under hydrostatic pressure.

external waterproofing

DELTA® Membranes are available as geocomposites to deal with such problems. They act as a protection layer and a waterproof drainage layer, and quickly remove the water to suitable land drainage around the structure. They prevent the build up of hydro static pressure on the structure and filter the water via an internal polypropylene filter layer. This prevents the fine ground particles from blocking the drainage facility and avoids destabilising the soil. The membranes also act as a protection layer against any primary waterproofing (type A waterproofing) on the structure against damage when the backfill takes place. The membranes can be used up to 10 metre depths.

external waterproofingTypical detail of our external waterproofing

A primary waterproofer is applied to the external wall, lapping over the foot of the foundation using Koster Deuxan 2CKSK SY 15 peel & stick membrane or Koster 21.  This is then covered by the Delta-Geo-Drain-Quattro, NP-Drain, MS-Drain or Terraxx, which is a waterproof, protection and drainage layer. This protects the primary waterproofing when the backfill takes place, and relieves the hydrostatic pressure from the structure by draining the groundwater down to the perforated land drain pipe, which is taken off to a soak-away or sump chamber. The open top edge of the membrane is capped off using Geo-Drain Clips and MS-Profile or Terraxx Profile for when using insulation. The backfill is then put in place. View below the external waterproofing video using our NP-Drain.

Make sure to check out the newest product to our range, DualProof, a pre-applied waterproofing and gas proof membrane that also protects against chemicals. Ideal for new build basements.



For any queries on cellar drainage equipment, basement waterproofing solutions or structural waterproofing systems please contact us.

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