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Slabs on plots attract more and more individuals. Among the wide variety of products available on the market, we compared eight models to help you make your choice.

Terrace slabs

While an ordinary tile can only rest on a flat, smooth and hard support, so masonry, slabs - or more exactly mineral tiles - are content with a bed of sand or crushed gravel (to facilitate drainage on a low permeability soil), or even a compact soil when it comes to creating a simple path (not Japanese way). It is true that these slabs are particularly solid. This eventually allows them to rely on synthetic pads. Adjustable in height or not, they can support the angle of four slabs.

Three types of materials for patio slabs

Slabs are molded products, mainly made of concrete and reconstituted stone. One incorporates sand and small aggregates, while the other incorporates finer aggregates as well as stone powder (porphyry and / or quartz for example).
Reconstituted stone is also distinguished by the use of white or tinted cement while the cement of concrete slabs is gray, sometimes with a shot blasted appearance. Concrete and reconstituted stone give birth to products of 40 to 60 cm side for the most part.
Concrete and reconstituted stone slabs are added to the porcelain stoneware tiles: a sandstone filled with silica and baked at 1300° C. This has the effect of vitrifying the silica, making the material non-porous (insensitive to gel and stain resistant) and particularly resistant to scratching. Moreover, it can be stained in the mass or decorated by enameling. Given its solidity, porcelain stoneware is found in large format to be laid in a conventional manner and 60 x 60 cm x 20 mm thick for laying on studs.

Height and slope: two points to check carefully

Despite its many advantages, laying on studs still has some constraints... Depending on the number and height of the studs, it increases the cost of the terrace about 12 € / m2 (3.5 blocks of 50-80 mm to 3,50 € each for 1 m2 slabs 60 x 60 cm). It also raises the level of the finished soil several centimeters: if the smallest studs measure only 2 cm in height, it is considered that it takes at least 5 cm to ensure a correct evacuation of water, necessary when the whole rests on a masonry support (terrace located in floor). It is therefore a factor to take into account, as well as the slope to give the support and the seal to add beforehand. Conversely, it is necessary as much as possible to limit the height of such a structure to 20 cm, in order to reduce the risks in the event of a slab breaking. This recommendation sometimes appears in the indications of the manufacturers.
Finally, we must not forget that laying on studs is incompatible with the passage, even casual, of any vehicles.

The waterproofness of roof terraces

If it can be obtained in several ways (for example with bituminous pavement strips), horizontal sealing must be carried out respecting the prescriptions of DTU 43.1 (Sealing of roof-terraces and inclined roofs with masonry load-bearing elements) and 43.5 (Rehabilitation of roof-terrace or inclined roof waterproofing structures). But also, the card C8 "Roofs and frames "(weak points of the heavy protection in accessible roof terraces) of the Quality Agency Construction (AQC).
Do not forget either that in addition to the watertightness must be evacuated water with minimum slopes of 1 cm / m to the evacuation holes.

Unique assets

Terrace tile

Even if an extra pad is sometimes necessary in the center for very large slabs and more generally along the edges of the terrace where the studs only support two slabs, this method of installation offers unique advantages: speed, simplicity, cleanliness, adaptability, no joints to realize, immediate commissioning. It's also easy to quietly circulate one or more power lines (outside lighting...) or a pipe supplying a tap. And these networks remain accessible at all times.

The studs used for laying terraces

Plot for terrace

In the upper part, the studs have fins that ensure the precise positioning of the slabs.
The height is usually adjusted using a large knob with notches at its periphery.

Set pads for terrace

By means of a special key, some studs offer permanent access to their adjustment device...
An advantage for the heavier slabs, which no longer need to be lifted to fit.

adjustable pad for terrace

The adjustment range of the pads is proportional to their height: from 20 to 30 mm for the smallest ones and from 155 to 245 mm for the bigger ones. Some also have a compensation capacity of a few degrees.

Slabs on studs

formats
While the 60 x 60 cm is a standard among the products to put on studs, some collections include smaller or larger formats, even rectangular. The layout (laying pattern) can be done with straight or staggered joints, but the latter then imposes a greater number of studs per square meter, just like the 40 x 40 and 50 x 50 cm formats. The cost of installation is then substantially higher.

slip
While reconstituted stone or concrete products naturally have a slightly rough surface, porcelain stoneware must be worked during its manufacture. It is then possible - but not mandatory for manufacturers - to have the "slipperiness resistance" of their products evaluated, in the form of an increasing performance index: from R9 to 13.

slabs on plots

The slabs on studs are easily matched with other coatings, such as wooden deck boards... They are then placed on studs, with joists oriented perpendicularly.

studs for terrace slabs

The thickness of slabs on plots is generally 40 mm, but there are thinner than 20 mm. Hence a reduced footprint that can make the difference in some cases.

Terrace on plots

With slabs laid on the ground and others on studs, it is easy to obtain a multi-level ground...
Aesthetic effect and guaranteed walking comfort with levels perfectly adjusted to the thresholds of the windows.

Comparison of eight slabs of terraces to put on studs

Test: eight slabs of terrace to put on studs: slabs


Click on the table to enlarge

Blooma (Castorama)

Blooma terrace tiles (Castorama)

Collection: Lagos 624927
Material: Shotblasted concrete
Format: 40 x 40 cm
Thickness: 40 mm
Unit weight: 4 kg (88 kg / m²)
colors: Anthracite
Aspect: Structure
slip: Yes
Conditioning: Single
Price*: € 24 / m²
Distribution: Castorama
The strong points: Value for money
* These prices are given as an indication and may vary according to the colors and aspects. They do not include installation accessories (studs, finishing elements if necessary...).

Square of Arc (Carré d'Arc)

Terrace tiles Carré d'Arc (Arc Square)

Collection: Ceres
Material: Reconstituted stone
Format: 60 x 60 cm
Thickness: 39 mm
Unit weight: 32 kg (89 kg / m²)
colors: Off white, light gray and dark gray
Aspect: Smooth and matte
slip: Yes
Conditioning:
Price*: 45 € / m²
Distribution: Wholesalers
* These prices are given as an indication and may vary according to the colors and aspects. They do not include installation accessories (studs, finishing elements if necessary...).

Leroy Merlin

Leroy Merlin terrace tiles

Collection: Océane 70174055
Material: Reconstituted stone
Format: 60 x 60 cm
Thickness: 39 mm
Unit weight: 32 kg (89 kg / m²)
colors: Beige gray, driftwood look
Aspect: Smooth and matte
slip: Yes
Conditioning: Single
Price*: 40 € / m²
Distribution: Leroy Merlin
The strong points: Floating wood appearance
* These prices are given as an indication and may vary according to the colors and aspects. They do not include installation accessories (studs, finishing elements if necessary...).

The Exclusives (Point P)

Terrace tiles The Exclusives (Point P)

Collection: Factory 2.0
Material: Stoneware
Format: 60 x 60 cm
Thickness: 20 mm
Unit weight: 17 kg (47 kg / m²)
colors: Beige, gray, anthracite
Aspect: Structure
slip: Yes
Conditioning: Single
Price*: 50 € / m²
Distribution: Point P
* These prices are given as an indication and may vary according to the colors and aspects. They do not include installation accessories (studs, finishing elements if necessary...).

Marlux

Marlux terrace tiles

Collection: Kera Linea (In'Stone)
Material: Concrete
Format: 60 x 60 cm
Thickness: 40 mm
Unit weight: 33 kg (92 kg / m²)
colors: Gray-blue, dark gray-blue, anthracite, caramel, beige, ivory
Aspect: Smooth and matte
slip: Yes
Conditioning:
Price*: € 73 / m²
Distribution: Trade and Specialty Retailers
The strong points: Treated stain resistant
* These prices are given as an indication and may vary according to the colors and aspects. They do not include installation accessories (studs, finishing elements if necessary...).

NOVOCERAM

Novoceram terraces

Collection: Outdoor Plus - Azimut
Material: Stoneware
Format: 60 x 60 cm
Thickness: 20 mm
Unit weight: 17 kg (47 kg / m²)
colors: Dark gray, gray, beige gray, light gray, white, brushed oak and oiled...
Aspect: Structure
slip: Yes (R11)
Conditioning: Carton of 2 pieces (0.72 m²)
Price*: 117 € / m²
Distribution: Trade and Specialty Retailers
The strong points: Palette of hues and aspects
* These prices are given as an indication and may vary according to the colors and aspects. They do not include installation accessories (studs, finishing elements if necessary...).

Pierra

Pierra terrace tiles

Collection: Rustic Bubble
Material: Reconstituted stone
Format: 50 x 50 cm
Thickness: 25 mm
Unit weight: 15 kg (60 kg / m²)
colors: Pink, yellow, beige, medium gray
Aspect: Slightly bubbled
slip: Yes
Conditioning:
Price*: € 39 / m²
Distribution: Wholesalers
The strong points: Other sizes available (40 x 40 and 75 x 50 cm)
* These prices are given as an indication and may vary according to the colors and aspects. They do not include installation accessories (studs, finishing elements if necessary...).

Soprema

Soprema patio slabs

Collection: Sopradalle Ceram
Material: Stoneware
Format: 60 x 60 cm
Thickness: 20 mm
Unit weight: 17 kg (47 kg / m²)
colors: Beige, light gray and anthracite
Aspect: Structure
slip: Yes (R11)
Conditioning: Single
Price*: 60 € / m²
Distribution: Wholesalers
* These prices are given as an indication and may vary according to the colors and aspects. They do not include installation accessories (studs, finishing elements if necessary...).


Video Instruction: Waterproofing - Flashing a Concrete Slab To Porch