Waterproofing is a small line on a project budget and a large line on a defects list. These are the questions that predict how the package will actually run.
- Which system, by name, and why that one for this substrate? "Advanced waterproofing" is not an answer.
- What is the dry-film build or sheet weight, and how will it be verified on site?
- Who does the surface preparation — you, or is it assumed done?
- What is the cure window before backfill or before the screed goes on?
- Which brand, and are you authorised by them or do you just carry them? These are different claims.
- What is the warranty term, what voids it, and who honours it — you or the manufacturer?
- How many crews can you mobilise, and are they yours or labour-only subcontracted?
- What happens at the cold joints and the penetrations? Ask for the detail, not the field.
- Show a written safety and quality policy. Procurement needs it in the prequalification pack anyway.
We answer all nine in writing at quotation, including the ones that are inconvenient for us.
Written by the INTRIC technical desk. If this raised a question about your substrate, ask it — send the detail and you get an answer, not a sales call.