Laying instructions

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Prepare CollaElite in a clean recipient. First pour an equivalent of about three quarters of the water needed. Gradually introduce the powder, and stir with a helicoidal whisk from bottom to top at a low number of revolutions (˜ 400/min.).

Then add water until the desired consistency has been reached and that is uniform with no lumps. To get the best mix and to mix the greatest quantity of glue, it is advisable to use an electric mixer with vertical blades and at a slow rotation.

Lay a layer of glue onto the wall, then spread it using a toothed spatula, and also onto the back of the stone you are about to put on.

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Lay the stones starting from the corners, alternating long stones with short ones and those of different sizes. Exert light pressure using vertical movements to let any excess glue come out.

Using the same method, apply the flat stones with the side on the vertical, thus creating the most natural interlocking possible, by trying to create spaces between stones of an equal thickness.

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Prepare StuccoElite by mixing one 25 kg sack with about 4.5 liters of clean water in a cement mixer or in a bucket. To obtain the mix, pour water into the recipient and add the powder gradually. You can do the mix in a cement mixer, in a bucket (by hand or with a mechanical stirrer at low rotation) or with a pug mill. Mix until the mortar is uniform and has no lumps. Use all the mix, do not leave any left over for the next mix.

Fill the triangular bags with StuccoElite and apply it uniformly and in large amounts in the spaces between one stone and another. Make sure you do not mark the stones.

When you have finished, let the mortar dry a little and then make it neat using a glove, the end of a mason's trowel, a wooden stick, a dry sponge or whatever you feel is appropriate.

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Time requirements

Laying times vary according to the product and the characteristics of the surface it is to be laid on.

An expert should be able to lay about 10m2 of stone per day. However, given the simplicity of the laying procedures, using experts is not essential.

Clients can thus decide to carry out the laying by themselves in their spare time, though clearly they will take longer than a professional.

Advice on laying

PietraElite® cladding is packaged in cardboard boxes in minimum quantities of 12 (one pallet). Each box contains al that is needed to lay about 1 m2 of plain stone or 3 'linear' meters of corner pieces.

  • Do not lay on surfaces with any layers of paint or demoulding agents or any plaster that has been worn by damp or weakened over time. Make sure you remove any trace of paint or demoulding agents with mechanical cleaning eg (blasting with a hydrosander).

  • The surface to clad should be cleaned thoroughly.

  • Do not lay on fine mortar or on any finishes that have little consistency, or in the presence of dust. It is best to remove the finishing if possible, or at least use some kind of pinning of the surface, or use a thin wire mesh plugged into the wall.

  • Respect the joints for the different expansions of the materials.

  • Do not lay on any surfaces whose temperature is lower than 5°C or greater than 30°C (if the surface has a temperature over 30°C, wet it with water).

  • Do not lay on very absorbent surfaces with unsuitable glues or without having wetted the surface.

  • Spread the glue on the surface itself and on the back of the stone, using a toothed spatula so that there is perfect bonding.

  • Premixed surface plaster must have a consistency that can bear a cladding of around 60-70 kg/m2.

  • We advise shaving the surface with PIASTRELKOLL. When the surface is completely dry, proceed with laying the stones.

  • Begin at the sides and go towards the center. Lay the stones out as 'naturally' as possible - not in a completely regular pattern.

  • Generally speaking, the longest edge of the stone should be laid horizontally.

  • If you get glue on the stone while laying it, immediately clean it with a sponge and water.

  • Once all the stones have been laid, if the type of stone requires mortar, then fill in the spaces between stones with pointing mortar, talking care not to get it on the stones. Wait for the mortar to dry and then remove any excess mortar with a sorghum brush. Once the cement has hardened sufficiently you can do this with a wooden stick as well. Clearly if the stones are laid dry, then the above procedure is not necessary.

  • For the upper part of external walls (eg for boundary walls), use a stone covering (eg with a wall covering) to avoid any water infiltrations.

  • Do not use any acids on the stone.


If correctly laid, cladding stone should not generally require any maintenance. If exposed to substantial levels of dirt, the cladding may need washing, just with water but with no high pressure jet, no detergents or any substances with an acid base.

Working materials

This is a professional mono-component glue that has high hydraulicity and adhesion, and no vertical slip. Combined with water release regulators, it provides quick and safe laying. It guarantees the immediate adhesion of the stone, while still allowing for any adjusting. CollaElite facilitates diagonal laying, top to bottom, and without the need for any distance pieces.

This is an eco-compatible mortar made of natural hydraulic lime (NHL 3.5), with a high level of transpiration and a very good yield. It is used to fill in any air spaces or blind areas between one stone and another, via the use of small triangular bags supplied by PietraElite.