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Legal steps, composite wood and swimming pool, bed of gravel, waterproofing, tiling: here are 5 questions that one sometimes asks about a terrace.

six questions about making a terrace

Install a composite wood deck around a pool

Can we build a terrace around a pool with composite wood boards? They deform in the heat and are they very hot when walking on it?

Composite wood is an excellent product. Ecological (the wood comes from sawmill waste and the plastic part comes from recycling), it perfectly mimics natural wood, but its hue and appearance do not change over time. For maintenance, a simple cleaning is enough.
It is true, however, that the very dark colored blades heat a lot in the sun, but not more than slabs of black shale. Some major distributors had problems with blades (from distant countries...) that have twisted. Solid blades seem more stable. If the product is of quality and if the installation is carried out in the rules of the art, there is no reason that the blades twist.

Can we lay tiles on a cracked terrace without risk of seeing it crack too?

My concrete deck is cracked. Can we lay tiles without the risk of cracking them?


If the cracks are stabilized, that is to say they no longer evolve, a pose with a "flex" glue is possible, after patching or pouring a screed. On the other hand, if these cracks are evolutionary, it goes without saying that it is not possible to lay tiles on it, except to see it crack quickly. I advise you in this case concrete slabs on plastic pads or wood or composite boards placed on joists screwed into the slab.

The watertightness of our non-accessible terrace has just been redone and we notice that water is already stagnating. Is this normal?

The slope of a non-accessible terrace is generally 1 to 2 cm / m, but some terraces may have a slope of zero. It happens then that a little water stagnates there: the DTU * authorizes a "flash" (in other words a hollow) of 3 cm. If the water exceeds a few centimeters, make sure that the overflows are not clogged. For security, send a letter (LR / AR) reserve to the company that carried out the work. You can do the same with the insurance covering the damage-work guarantee (if you have subscribed it...).

* Unified technical document.

The steps to build a terrace

I want to make a wooden deck accessible from the living room of my house. The elevation will be approximately 1.20m. What are the steps to take?


Start by consulting the PLU (local planning plan) or the POS (land use plan) of your municipality to know the locally applicable provisions. As a general rule, for a raised terrace of 1.20m, a simple declaration of work is enough if its surface is between 5 and 20m2 (40 in urban area). Beyond that, you have to apply for a building permit.

What solution to make a wooden deck on a bed of gravel planned for a concrete slab?

If you do not want to pour slab, you can lay bastaings flat on the gravel bed. Then screw perpendicular slats, on which you can pose without problem the wooden terrace of your choice. For outdoor use, it is prudent to take Class IV treated wood.

How to remedy slippage on a terrace made of porcelain tiles?

For a terrace, it is always necessary to take tiling for the outside, but also with a coefficient of friction which corresponds to the use which will be made of it.

This coefficient is from R9 to R13. An R11 rating is perfect for a terrace.
If the tiles are very slippery, it is possible to treat them with a commercial slip reducer that will alleviate this disadvantage (Algigrip, Algimouss, Solagrip...).


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