Car park waterproofing built to carry the load.
Car park decks combine everything hostile to waterproofing — hydrostatic pressure, constant vehicle traffic, oil and fuel, thermal movement and heavy point loads. We install trafficable deck systems engineered to take all of it and stay watertight.
A car park deck is a waterproofing membrane you drive on
Car park decks present a unique combination of waterproofing challenges. The membrane isn’t hidden and protected beneath tiles or screed — it is the driving surface, or immediately beneath a thin wearing course. It has to be waterproof and it has to be trafficable: abrasion-resistant, able to carry vehicle loads and point loads, resistant to oil, fuel and tyre scuffing, and durable under constant use.
Below-ground car parks add hydrostatic pressure to the mix — water pushing up through the base slab and in through perimeter walls. Elevated decks add thermal movement and the need to protect the occupied spaces below from any leak. Both add expansion joints that move continuously under traffic. It is one of the most demanding applications in the industry.
We waterproof and remediate car park decks for body corporates, building owners and facility managers across Brisbane and the Gold Coast — with traffic-grade systems, correct joint and drainage detailing, line marking reinstatement, and staging that keeps the car park operational.
Trafficable, watertight, durable
Traffic-grade deck membranes
Polyurethane and epoxy traffic-deck systems engineered to be waterproof and to carry vehicle traffic, loading and abrasion.
Expansion joint systems
Watertight, trafficable expansion joint systems that move with the structure while carrying vehicle loads.
Below-ground tanking
Waterproofing and remediation of below-ground car park walls and slabs against hydrostatic pressure, from the internal face.
Drainage & falls
Correction of falls and drainage so decks shed water to outlets rather than ponding — essential to membrane longevity.
Concrete protection
Anti-carbonation and chloride-barrier coatings to protect car park structural concrete and its reinforcement.
Deck remediation
Removal and replacement of failed car park deck coatings, with line marking reinstated and works staged around operations.
Keeping the car park running
Survey & stage
We survey the deck condition, drainage and joints, and plan a staging sequence that keeps as much of the car park operational as possible throughout the works.
Prepare the deck
Concrete repaired, cracks and joints treated, surface mechanically prepared to the correct profile, and drainage corrected where needed.
Apply the traffic system
The trafficable membrane system installed to specified thickness with aggregate broadcast for slip resistance, and joints detailed for movement and traffic.
Line marking & handover
Line marking, bay numbers and signage reinstated, and a handover package of certificates, photographs and warranty provided.
The performance requirements we build to
A car park system that meets only the waterproofing requirement, or only the trafficking requirement, will fail. It has to do both, together.
- Waterproof under pressure — below-ground decks resist hydrostatic uplift; elevated decks protect occupied space below.
- Trafficable & abrasion-resistant — the system carries vehicle loads, point loads and constant tyre wear without breaking down.
- Oil & fuel resistant — unavoidable automotive contaminants must not degrade the membrane.
- Slip resistant — aggregate-broadcast surfaces provide safe traction for vehicles and pedestrians.
- Movement accommodating — expansion joints stay watertight while flexing under continuous traffic.
- Serviceable staging — works sequenced so the car park keeps functioning for residents and tenants.
Car Park Waterproofing FAQs
In almost all cases, yes. We stage car park works level by level or bay by bay so a proportion of the car park remains operational throughout. We coordinate closely with building management on timing, resident communication and temporary parking arrangements to minimise disruption.
Water coming through an elevated deck usually means the deck membrane or its joints have failed. We diagnose whether it’s the field membrane, an expansion joint, a crack or a drainage issue, then remediate — which for a failed deck coating means preparing the deck, treating joints and cracks, and installing a new traffic-grade system. Line marking is reinstated afterward.
A quality traffic-grade deck system, correctly installed and maintained, typically delivers many years of service before recoating — though wear in high-traffic zones like ramps and turning areas is faster and may need earlier attention. Regular maintenance and prompt attention to localised wear significantly extends the overall system life.
Yes. Line marking, bay numbers, directional arrows and signage are reinstated as part of the works so the car park is returned fully operational and compliant.
Explore related work
Protect your car park deck
A leaking car park deck damages the structure and the cars below. Book an assessment for a trafficable system and staging that keeps you operational.