Reducing Wet Area Risk in Multi-Residential Projects Through System Specification

Why Technokolla tiling and waterproofing should be specified as a system in multi-residential

Apartments compress complexity.

Bathrooms sit over bedrooms. Balconies project above living rooms. Programmes run vertically. One delayed trade can hold up an entire floor.

In that environment, waterproofing and tiling are not just finishes.
They are one of the biggest programme risk multipliers on the project, and one of the most expensive to remediate if something goes wrong.

As Scott Newton, Managing Director at Surtec, says:

“Apartments don’t fail fast. Wet areas fail slowly, until the stain appears in someone else’s unit.”

And by then, the issue is rarely isolated.

The real risk is interfaces

A tiled wet area is not one product. It is a layered build-up:

Substrate → Primer → Membrane → Reinforcement → Adhesive → Tile → Grout → Movement joints → Sealant.

Failures do not usually happen because a membrane “didn’t work.”
They happen at the interfaces. Between products. Between trades. Or after substitutions are made under programme pressure.

Apartments amplify that risk:

• The same detail is repeated dozens or hundreds of times
• A single inconsistency can affect multiple units
• Accountability becomes unclear when products come from different suppliers

That is why more project teams are moving toward a coordinated system approach.

“Every substitution creates a new interface. Every interface is a new risk.”

Why specifying a full system will change the equation

The Technokolla Tiling and Waterproofing System, supplied in New Zealand by Surtec, brings together membranes, primers, reinforcement, adhesives, and finishing products into a single, compatible specification.

For apartment projects, which deliver three practical advantages:

1. Fewer compatibility risks

Products are designed and specified to work together, not matched on site.

2. Better programme control

Quantified schedules, staged deliveries, and technical build-ups reduce RFIs, substitutions and delays.

3. Clear responsibility

When everything forms part of one system, accountability is simpler.

Apartment programmes rarely slip because of one dramatic failure.
They slip because of small disruptions repeated across multiple floors. The wrong primer on one level. Missing reinforcement on another. A late change that triggers a new approval loop.

A system removes much of that friction before it starts.

Details matter more in apartments

When wet areas sit over neighbours, precision matters.

• Membranes must sit directly beneath the tile adhesive, not buried deep in the build-up
• Falls belong in the substrate, not formed in the membrane
• Corners and penetrations require reinforcement
• Movement joints are essential, especially with large-format tiles

In multi-residential projects, repeatability is everything.
If a detail works, it needs to work the same way, floor after floor.

The bottom line

Apartment projects do not need more products.

They need:

• Programme certainty
• Repeatable buildability
• Clear compliance pathways
• Durable long-term performance

A coordinated tiling and waterproofing system, backed by local technical support, helps keep wet areas uneventful.

And in apartments, uneventful is exactly what you want.

“The best waterproofing outcome is the one nobody ever has to talk about, because it simply performs for years.” Says Scott.