Matching Waterproofing Systems with Project Types - A QS Perspective

Every waterproofing job isn’t created equal - and neither are the systems. From membrane decks to tanking basements, choosing the right system matters. This post breaks down how understanding the project type through a QS lens can guide better system selection, reduce rework, and support smoother installs - without stepping on the applicator’s toes.

EDUCATIONAL

Sumit Kumar

7/31/2025

The QS Angle on System Selection

As Quantity Surveyors specialising in waterproofing takeoffs, we often see the same issue play out: mismatched systems being priced or assumed early on, only to be revised later with urgency and cost pressure. That’s where a clear, QS-led overview upfront adds real value.

By reading drawings carefully and understanding the project's functional needs (trafficable vs non-trafficable, below grade vs above, new build vs retrofit), we help ensure the right system is scoped and priced from day one.

Different Projects, Different Needs

Here’s a simple breakdown of typical NZ waterproofing project types and system categories:

Decks/Balconies (Trafficable or Non-trafficable)
Often need robust membrane systems like torch-on, tpo, pvc or liquid-applied. Drainage, door threshold and upstand detailing are key.
Basements/Retaining Walls (Below Grade)
These demand tanking systems, sheet membranes, or spray-applied barriers. Site conditions matter.
Wet Areas (Internal Bathrooms, Laundries)
Smaller scope but require tight coordination and often fast turnaround in residential builds.

Why This Matters at Takeoff Stage

We’re not here to choose the system - that’s up to the client or architect. But as QS, we ensure the scope reflects the right assumptions based on system intent. That includes:

Flagging missing upstands, sumps, or junctions
Highlighting areas needing compatible primers or substrates
Clarifying overlaps, termination details, or drainage layers
Building templates that match supplier systems for quicker quoting

Smarter Quotes, Fewer Variations

A sharp takeoff can mean the difference between quoting fast or quoting twice. When a supplier or applicator receives a clean scope that already matches their system logic - it speeds up pricing, builds trust, and reduces the need for clarifications.

That’s where our experience becomes your edge.

Ready to Streamline Your Next Takeoff?

If you want your quotes to reflect real-world install logic - not guesswork - we’d love to help. Our QS takeoffs are built specifically for waterproofing workflows.
Connect with AQUOSYNC now and let’s make quoting cleaner, clearer, and on-point.