Lay out stones and mix from various cartons at least 2m to create a ballance between different colours, shapes, thickness and textures
Add mortar taking into consideration the amount of water for good accretion and the right consistency.
If the installation includes corners then begin from the corner of the wall & continue the installation in line with the flat elements.
When installing the joint the creation of vertical joints in parallel lines must be avoided
If empty gaps are large, fill them with stones by cutting them to the size needed.
In case the stone surface dirties from the mortar it is recommended to clean it with a soft wire brush, a litttle before the mortar “hardens”.
Do not try to clean when mortar is fresh and do not use metal.
Before installation – Preparing the surface
We clean the substrate from dust, dirt, for good accretion of the mortar-shapes, thickness and textures. Level out the first line of where the stones will be placed.
If we work on a absorbent substrate like gypsum board or wood, we have to apply primer to reduce the absorbency
Using the spatula or resambing tool, perimetrically clean the stone from overlapping concrete for better installation. Since the back surface of the stone is dry , wet it with water to avoid the absorption of water of the mortar.
Apply mortar on the installaton surface as much as needed so that it does not dry out when installing the stone
Apply mortar at the back surface of the Stone as much as possible so there is no gap between the stone and the surface.
Apply the stone by pressing hard to ensure a very good adherence of the mortar in the back surface of the stone.
In the installation of stone use a rubber mallet (rubber hammer) in order not to wound the stone
Installation without joint
Fill the perimetric channel of the stone with mortar by using the spatula. Remove any excess mortar using a towel.
Installation with joint
Provided that there is a joint, in order to stabilise the stones small spacers can be used where it is needed
For the installation use a pastry bag or a grouting gun. In both cases effectively cut the end until the desirable width for the joint is achieved.
Lay the mortar with a spatula or special tool
If mortars gets on the surface of the stone before it hardens (after ó or 1 hour) brush off the mortar with a soft wired brushed or hard plastic, do not use metal.