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Descellée, a slab of coping night to the aesthetics of the edge of the pool. But it can especially become a dangerous element for bathers or damage the basin if it falls into the water. Urgent repair is needed before the tragedy...

Text and Photos P. Maviel

Practical advice

To prevent flying debris from scraping debris from glue, adhesive mortar or grout during repair, float
and moor an air mattress along the rim beneath the work.

Essential accessory of finishing of the edge of the swimming pool, the coping also ensures the transition and the junction with the beach. In stone, ceramics, reconstituted concrete... the slabs of the coping serve as much to sit with your feet in the water as to take support for a dip. The fun activities often take place in the same places, some are subjected to severe tests and finally come off. With a few tools and basic products - some glue mortar and stone powder seal - it's easy to put them back in place.

Take off the slab

As soon as you realize that a slab is moving underfoot, remove it even if you do not have time to repair immediately. You will avoid any risk of accident.
● Remove the slab (s), taking care not to drop debris into the pool. Take the opportunity to try to identify the reason for this incident. This is often the wrong application of the adhesive mortar, it has not been spread evenly on the floor and on the back of the tiling. If all the glue remained on the back of the slab, it is because it did not adhere to the support. The application of a primer is essential before re-gluing a new tile.
● Remove all traces of mortar and joint with a hammer and chisel, taking care not to damage the adjacent slabs. A hammer drill with chipping function is also very effective for this type of work. After removing the adhesive mortar and the joints on the floor and on the back of the tile, cleaning with a wire brush removes the residue and roughens the surfaces.

● Then a thorough sweep is required to remove dust and small debris, followed by leaching and rinsing.

Choosing the right glue

In order to avoid the renewal of the incident, it is advisable to pass on both surfaces to stick a primer which improves the adhesion of the supports ("Ibotac" of weber & broutin for example).
● The border slabs are for the most part very thick elements that require a sealed installation on mortar to be made on site or with a mortar adhesive ready to tempt. The latter is generally compatible for indoor and outdoor installation.
● A high-adherence, slip resistant adhesive mortar with an extended open time (time during which the tiles can be adjusted further) simplifies installation and guarantees good durability over time (eg "Fermaflex classic" from weber & broutin). ).
● Wait twenty-four hours of drying before grouting the glued slabs. For this purpose, use a grouting mortar suited to the width of the joints and resistant to chemical attack, cleaning agents and intensive use ("fermajoint HR" by weber & broutin for example).

Remove the slab

Remove the slab

Remove the slab that no longer adheres. With a chisel or a brick chisel, remove the glue and seal residues on the support and the back of the slab. If a nearby item is threatening, peel it off.

Clean and dust

Clean and dust

Dust prevents adhesion between the border and the support. Clean them with a wire brush to loosen any mortar particles. Dust carefully.

Apply a primer

Apply a primer

To obtain a durable assembly, apply with a brush, roller or sponge a primer on the support and back of the slab. Let dry according to the manufacturer's instructions.

Mix the adhesive mortar

Mix the adhesive mortar

Strike the adhesive mortar in a trough with a volume of water indicated in the instructions for use until a thick but soft homogeneous paste is obtained. Let stand a few minutes before use.

Moisten surfaces to stick

Moisten surfaces to stick

Moisten the two surfaces to be glued with a sponge so as to avoid too fast absorption of the water of the adhesive mortar. This one would then dry too quickly and could not guarantee a perfect adhesion.

Apply the adhesive mortar

Apply the adhesive mortar

Apply with a toothed spatula (teeth about 8 mm) a thick layer of mortar glue on the support and the back of the slab. A trowel can do the job as long as you streak the mortar.

Lay and press the slab

Lay and press the slab

Lay the slab. Then press hard on or beat with a rubber mallet to crush the furrows of the adhesive mortar that must flow back to the sides. Clean as you go.

Check the alignment

Check the alignment

Check at the bubble level or with a metal ruler the alignment of the slab nose with respect to the others. After twenty-four hours of drying, apply grouting mortar.


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