Below-Grade Waterproofing System
A waterproofing assembly for foundations, retaining walls and below-grade structures, matched to the water condition and confirmed by technical review.
Is this the right assembly?
- Foundations or retaining walls need waterproofing
- Interior wet areas require a continuous membrane
- The water condition and soil are understood or can be assessed
- A positive- or negative-side approach is defined by design
These are indicators, not a specification. Suitability is confirmed by a project review.
Substrates
Product families
The assembly, layer by layer
Protects the membrane during backfill
Continuous below-grade membrane
Coves, joints and penetrations
Matched to the substrate
Sound, clean and prepared
Layers shown top (finish) to bottom (substrate). Actual products and build are per specification.
What we assess first
- Hydrostatic pressure and water table
- Positive- vs negative-side application
- Soil chemistry and drainage
- Structural movement and joints
- Access and sequencing with construction
- Prepare and clean the structure
- Form coves and treat joints and penetrations
- Confirm the water condition and approach by review
- Prime as required
- Cold and construction joints
- Wall-to-footing transitions and coves
- Penetrations and tie-holes
- Terminations above grade
How it goes together
Assess & prepare
Confirm the water condition; prepare the structure.
Detail
Form coves and treat joints and penetrations.
Prime & waterproof
Prime and apply the membrane continuously.
Protect
Install protection / drainage before backfill.
What it delivers
- Continuous, detailed below-grade protection
- Options for positive- and negative-side conditions
- Interior wet-area suitability with low-odour products
Where to take care
- Hydrostatic and immersion conditions require technical review
- Backfill and protection sequencing is critical
- Repairs after backfill are difficult — detailing must be right first time
- Protect the membrane from damage before backfill
- Apply within specified conditions
- Allow cure before covering
- Water condition and approach confirmed
- Detail and cove waterproofing inspected
- Continuity verified before protection
- Backfill protection confirmed
Backed when specified & installed correctly
Warranty coverage for this system depends on specifying it appropriately for the conditions, installation by a qualified installer, and a registered project. Coverage terms are defined by the applicable warranty document.
Technical documents
The specification, installation guide and detail drawings for the Below-Grade Waterproofing System are maintained with revision control and available on request.
Request specification Specifications libraryEvaluate this system for your project
Share your substrate and conditions for a confirmed recommendation.