Why choose Avenir Renovations?
What is a masonry slab?
The masonry slab is a reinforced concrete slab poured on a previously prepared ground. It can serve:
- as a final covering (smooth, deactivated or printed finish)
- as a base for tiles, natural stone, wood, pavers or clip-on slabs
- as a load-bearing structure for durable outdoor fit-outs
It is reinforced with a metal mesh or fibers, and can be designed with slope, expansion joints, non-slip or decorative finish.
Steps for installing a masonry slab with Avenir Rénovations Belgium
Avenir Rénovations Belgium: 5 steps for your masonry slab – study, preparation, formwork, pouring, then drying and finishing.
Why choose a masonry slab for your exteriors?
The masonry slab offers exceptional strength, adapts to all uses, ideally prepares the ground, and serves as a versatile support.
The masonry slab withstands heavy loads, weather conditions, erosion, and freeze/thaw. It is designed to last several decades without settling.
It can remain raw (smooth concrete finish, bush-hammered, deactivated...) or serve as a base for a covering: natural stone, porcelain stoneware, wood, outdoor tiles, concrete pavers...
It is suitable for terraces, driveways, parking lots, garden sheds, technical rooms, as well as pool decks. It can also accommodate a carport, a pergola, or a jacuzzi.
It allows for leveling, creating a slope for rainwater drainage, and ensuring a flat, stable, and perfectly leveled base.
Price of installing a masonry slab in Belgium
Factors that influence the price
- Thickness and strength of the slab (pedestrian or vehicle)
- Total surface area to cover
- Site access and logistics (narrow, remote, floor...)
- Type of finish (raw, deactivated, stamped, covered)
- Drying time required before laying the covering
A custom quote is essential to define the exact rate according to your project.
Average price per square meter
| Type of slab | Average price (VAT included, installation included) |
| Pedestrian slab (terrace, driveway) | 70 € to 100 € / m² |
| Vehicle slab (garage, parking) | 90 € to 140 € / m² |
| Deactivated or decorative slab | 100 € to 150 € / m² depending on finish |
| Ground preparation (earthworks) | 10 € to 30 € / m² depending on the nature of the ground |
Common uses of the masonry slab
- Outdoor terrace (raw or covered slab)
- Garden courtyard or path
- Pool deck
- Base for pergola, garden shed, carport
- Parking slab (driveable)
- Extension or veranda slab
Technical characteristics of an outdoor concrete slab
| Element | Possible characteristics |
| Thickness | From 10 to 20 cm depending on use (pedestrian, driveable) |
| Reinforcement | Welded mesh ST25, synthetic or metallic fibers |
| Concrete dosage | Generally 350 to 400 kg/m³ for outdoor use |
| Finish | Smooth, brushed, bush-hammered, deactivated or printed |
| Waterproofing / slope | Slope of 1 to 2% for water drainage |
| Expansion joints | Recommended for large surfaces |
Possible types of finishes
| Finish | Advantages |
| Smooth | Sober appearance, easy to clean |
| Brushed | Non-slip, well-finished raw look |
| Deactivated | Natural aesthetic with exposed aggregates |
| Printed | Decorative (imitation of pavers, wood, slabs, stone...) |
| Covered | Tiles, wood, resin, stone... according to your tastes |
Why choose Avenir Rénovations Belgium?
- Free technical study
- Custom design of your slab
- Professional quality concrete, dosed and reinforced according to use
- Compliance with slopes, levels and Belgian standards
- Possibility of decorative finish or covering
- Warranty on masonry work
Request your free quote for an outdoor concrete slab
Do you want a solid, stable, and durable base to set up your terrace, yard, or future garden shed?
Trust Avenir Rénovations Belgium with the construction of your masonry slab for a clean, durable, and compliant result.
Contact us today for a free on-site technical study, and receive your personalized quote, with no obligation.
Frequently Asked Questions – Installation of masonry slabs in Belgium
What is the recommended thickness for an outdoor slab?
This depends on the intended use:
- 10 to 12 cm is sufficient for a terrace or pedestrian slab.
- 15 to 20 cm is necessary for a load-bearing slab intended for light vehicles or a carport.
Our technicians adjust the thickness and type of reinforcement based on the type of soil and loads to be supported.
Is it mandatory to reinforce a concrete slab?
Yes, except in some very specific cases. The reinforcement (welded mesh or fibers) helps to limit cracking, increase mechanical strength, and ensure good durability over time, especially in Belgium where freeze/thaw cycles are frequent.
Is an outdoor concrete slab sufficient as a finish?
Yes, if you choose a suitable finish: smooth, brushed, bush-hammered, exposed aggregate, or even stamped concrete. However, it is also possible to apply a complementary covering (tiles, wood, stone, resin...) depending on the desired aesthetic.
How long should you wait before applying a covering on a concrete slab?
It is recommended to wait at least 3 weeks, ideally 28 days, for the concrete to reach its maximum strength. This timeframe may vary depending on weather conditions, thickness, and ambient humidity. A residual moisture check is sometimes necessary before laying tiles or outdoor flooring.
Can a concrete slab be installed on a slope?
Yes, and it is even highly recommended for outdoors. A slope of 1 to 2 % is generally applied to allow for natural drainage of rainwater towards a drain, gutter, or garden.
