A multi-storey car park in Dubai or Doha is a civil-engineering structure with a paint problem on top. Get the system right and you waterproof the building. Get it wrong and you have leaks, line-marking failure, and a complaint file.
The five-layer system
- Primer (0.2 mm) — solvent-free epoxy, locks the substrate
- Crack-bridging membrane (1.5–2 mm) — elastomeric PU, the waterproofer
- Wear coat (1.5–2 mm) — pigmented PU with quartz aggregate for slip rating
- UV-stable top coat (0.3–0.5 mm) — aliphatic PU, the colour and gloss
- Line-marking (0.3 mm) — cold plastic or PU paint for bays, arrows, disabled
PU vs PMMA — the real trade-off
PU (polyurethane): cheaper, tougher, 12–24 hr cure. Standard choice for Gulf malls.
PMMA (methyl methacrylate): 2–4 hr cure to full traffic. ~25% more expensive. Standard for airports, hospitals, anywhere live operation can't afford a closure.
Where Gulf decks fail (and how to avoid it)
Joint detail at expansion gaps
Movement joints between concrete pours move with thermal cycling. Bridge them with a backing rod and PU caulk in the membrane layer; never paint over them solidly.
Drain transitions
Pre-form a cone around each drain with self-levelling PU; coat the drain edge separately. Otherwise the membrane lifts at the drain.
Upstands and walls
Run the membrane 200 mm up every wall and column. Cove fillet at the floor-wall junction.
Ramp surfaces
Heavy quartz broadcast for R11 minimum. Slip injuries on ramps are a major Gulf insurance claim category.
Night-shift logistics
A live mall car-park can't close. We pour zone-by-zone overnight, masking lift lobbies, fire exits and accessible bays. Cure rate engineered to allow vehicles back by 06:00. Recent project: 14,000 sqm Dubai mall basement, 11 weekends, zero customer complaint.
The car-park deck isn't a "floor" — it's the waterproofing for the structure below. Spec it like one.
Send us your deck plan — we'll quote within 1 to 2 working days, including night-shift phasing.