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Basement and negative-side waterproofing

Waterproofing

Basement and negative-side waterproofing

Interior crystalline and cementitious systems for damp and leaking basements that cannot be excavated.

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When do you need it?

  • Persistent damp and salts at basement wall bases
  • Render and paint are blistering and flaking
  • The outer face is inaccessible due to neighbouring plots
  • The basement is to become storage or living space

Layer build-up

Basement and negative-side waterproofing
  1. 5Breathable renderFinish
  2. 4Negative-side mortarOn brick/block surfacesView product →
  3. 3Crystalline waterproofingOn concrete surfacesView product →
  4. 2Plugging mortarActive leak points
  5. 1Existing wallDefective render removed
Layers are listed bottom-up; details are finalised per project after survey.

Process

Step by step

  1. 01Survey and measurement

    Our technical team measures moisture on site, inspects existing layers and details, takes dimensions and photos.

  2. 02Render removal

    Damp render is removed to a sound base and at least 50 cm above the damp line.

  3. 03Active leaks

    Leaking cracks and points are opened and plugged; fillets are formed at corners.

  4. 04Waterproofing

    Crystalline or negative-side mortar is applied in two coats as appropriate and moist-cured.

  5. 05Finish

    Finished with breathable render and mineral paint.

  6. 06Inspection and handover

    At completion we carry out a water test or visual inspection and hand over a photo report and written warranty certificate.

Products in this system

FAQ

Is interior waterproofing permanent?

With proper preparation it lasts long, though the wall itself stays wet. External waterproofing remains the first choice where possible.

How do you tell damp from condensation?

Moisture meters and surface temperature readings distinguish them; condensation usually appears in winter and in corners.

Can it be painted?

Yes, breathable mineral or silicate paints are recommended; plastic emulsions may trap moisture.