Waterproofing basement walls

Basement waterproofing: Sealing outer walls with bitumen membranes

For a basement waterproofing solution that’s immediately water resistant, check out our guide. We’ll get you started with what you need and how to do any substructure and deep structure waterproofing on shoring walls and more.

Bitumen membranes provide easier waterproofing application.

Basement waterproofing systems: Substructure and deep structure waterproofing

The right basement waterproofing system selection depends on several factors including the temperature at the job site. For outside basement waterproofing or any other substructure and deep structure waterproofing, use Polybit’s Bitustick and Bituplus range of products as well as accompanying system products.

Preparation for waterproofing basement walls

To begin, prime the walls with Polybit Polyprime SB to improve the membrane’s adhesion. Take special consideration of the substrate condition. Below you will find instructions on how to prepare the substrate and how to apply Polyprime SB:

  1. Clean the surface from any substances that might diminish adhesion, e.g. dust, oil and grease.
  2. Smooth uneven concrete structures. Repair pockets, cracks, mortar joints and large defects with a repair mortar like Henkel Polybit’s Polycrete products.
  3. Make sure the surface is dry before applying the primer. When working with Polyprime SB, wear safety goggles, gloves and a protective mask.
  4. Mix Polyprime SB thoroughly to ensure there’s no sediment left.
  5. Apply a generous and uniform coat with a brush or roller at a coverage rate of 4-5m2/Ltr.
  6. Allow full dry time before applying the membrane.

How to seal outside house foundations with the Bitustick range of self-adhesive membranes

After the primer has dried, apply the Bitustick self-adhesive membrane to the clean, dry surface as follows:

  1. Carefully unroll the self-adhesive membrane as needed and cut it to the required size. Make sure not to damage the membrane.
  2. Check if the membrane fits the substrate profile.
  3. Work vertically down walls, peeling 1m of the release film at a time.
  4. Align and fix to the substrate, adhesive side down.
  5. Smooth the membrane to ensure no air is entrapped.
  6. Continue peeling the release film backing and attaching the membrane to the surface. Overlap between strips should be at least 100mm.
  7. At the seams, smoothen the overlapping areas between the strips to improve adhesion. Did you know? The selvedge on one side of the Bitustick self-adhesive membranes allows bitumen-to-bitumen contact on the overlapping parts.

The basement/substructure is going to be exposed to weather for a longer time? Polybit Bituboard will protect the self-adhesive and torch applied waterproofing membranes!