Choosing and Applying Car Park Floor Coatings

• Ahmet Toka
• 7 August 2026
• Floor Coating
• 4 min read

A car park is the most heavily stressed yet least discussed surface in a building. Vehicle loads, the horizontal forces of braking and manoeuvring, the salt and water carried in on tyres in winter, the temperature differences that build up on ramps in summer — all of it comes together on the same floor. What is more, on upper levels this floor is at the same time a roof for the level below.

In this article we treat the car park floor as two separate problems: surface performance (abrasion, slip, cleaning, appearance) and waterproofing (preventing water passing through to the level below). We then cover details specific to car parks such as ramps, line marking and wayfinding.

An upper-level car park deck is in fact a roof. The coating chosen there takes on not only abrasion but also keeping the level below dry.

Ahmet Toka, General Manager

Factors That Stress a Car Park Floor

• Point loads and horizontal forces: The weight of a vehicle bears on four small contact areas; braking and steering apply torsion to the surface. This is a different kind of stress from straight-line traffic.
• Salt and chemicals: Road salt carried in on tyres in winter is one of the most aggressive agents for reinforcement in concrete. Spills of oil, fuel and antifreeze are also continuous.
• Water and moisture: Water dripping from wet vehicles, wash water, and rainfall on open levels.
• Temperature differences: The day–night and summer–winter differences are pronounced, particularly on open upper levels; the coating must tolerate them.
• Tyre marks and abrasion: Hot tyres can leave marks on light-coloured coatings; cleanability matters.
• Fire and smoke behaviour: The fire classification of the material used in enclosed car parks must comply with the requirements of the project.

System Selection in Enclosed Car Parks

In enclosed car parks at ground level or in contact with the soil there is no space below to protect; the priority is surface performance.

• Epoxy systems: They provide high compressive strength and excellent adhesion. For medium and heavy traffic, mortar types or types reinforced with quartz filler are preferred. It is an economical and widespread solution. Details: epoxy floor coating.
• Polyurethane systems: Thanks to their elasticity they tolerate hairline movement in the concrete beneath and their impact resistance is high. Where there is a risk of cracking in the deck, this is the right choice. Details: polyurethane floor coating.
• Surface hardening: For car parks where the budget is limited and expectations of chemical protection are low; it stops dust production and reduces abrasion. Details: floor polishing and dust-proofing.

Upper Levels and Open Car Parks: The Coating Is Also the Waterproofing

On decks that carry vehicle traffic and have occupied space beneath them, two jobs are expected of the coating at once: resisting abrasion and keeping water out. This narrows the system choice.

The systems used on such surfaces are generally layered: primer, elastic waterproofing layer, wearing layer and top coat. The elastic layer bridges movement and hairline cracks in the deck, while the wearing layer takes the traffic. On open levels the top coat must be aliphatic for UV resistance.

On projects with heavy traffic that need to be back in service quickly, polyurea systems are also used; the ability to open to traffic within hours can be decisive for operators. For the waterproofing side as a whole see waterproofing page.

Ramps and Special Areas

In a car park, failure always starts in the same places. These areas require separate solutions.

• Ramps: Here the tyre both grips and slips; the slip resistance of the surface must be high. This is achieved by broadcasting aggregate or forming a non-slip texture. Ramps are also the areas that receive the most sunlight and the most washing.
• Turning points: Here the steering is turned on the spot, applying torsion to the surface. The coating thickness is increased.
• Entrances and exits: Rain, snow and salt are carried directly to these points. Chemical resistance and water management become important.
• Joints: Deck joints are carried through the coating and resolved with a profile or a high-hardness filler capable of taking vehicle loads. Details: joint sealing applications.
• Drainage channels: The coating must be turned into the channel and terminated there, not finished at the edge.
• Column bases: The points that take the most impact during manoeuvring; protective banding and marking should be planned.

Lines, Markings and Wayfinding

The work is not over when the car park floor is finished; the area also has to become legible. This is a matter of both safety and operational efficiency.

• Parking bay lines and numbering: Dimensions are planned according to vehicle sizes and regulations. Details: car park road markings.
• Pedestrian routes: Made clear by colour separation; continuity matters where routes pass between columns.
• Arrows and direction markings: Making the one-way flow clear prevents congestion and accidents.
• Accessible and electric vehicle bays: Marked with a separate symbol and colour.
• Column numbering and level markings: A user who cannot find their car is the most common complaint about a car park. Details: wall and column painting and numbering.
• Height and direction signs: Information before entry; see wayfinding and signage.

Planning the Application

Car parks are usually coated while in use, which makes planning as important as the technical part of the work.

1. Phasing. The area is divided and worked in sections; users are provided with alternative routes and a temporary parking arrangement.
2. Surface preparation. The surface is opened up by shot blasting or milling. Oil-stained areas are cleaned separately; oil is the most common enemy of coating adhesion.
3. Repair. Broken, spalled areas and areas with exposed reinforcement are dealt with using concrete damage repair are dealt with.
4. Moisture and adhesion testing. Application does not begin until measurements have been made.
5. Ventilation. Ventilation must be planned for resin application in an enclosed car park.
6. Return to service. The times for opening to pedestrian and to vehicle traffic differ; full curing must be awaited for vehicle traffic.

For a comparison of all floor systems see floor coating applications page.