Mounting onto a stone wall
Tulppa boards can be mounted onto strong stone walls using mortar. Clean the wall of any loose materials and dust, then wet the wall using a cloth or sponge. Use a compatible, tested ARDEX, Casco, SCHÖNOX or Sika tile mortar.
If the stone wall is level and straight, the mortar can be combed onto the wall using a mortar comb with spacing of 8 mm or more. The boards should be affixed to the fresh mortar immediately. If the wall is irregular, point mounting should be used. Apply small mounds of tile mortar evenly across the board at 15 to 20 different points. Then press the board against the stone wall using a wooden plank and a bumping mallet so that the board is straight (measure using a spirit level). When using point mounting with very irregular walls and thick filler layers are required, the board must also be secured using Tulppa O brackets and 100 mm screws after the mortar has dried. Seal the brackets using sealing tape.
In walls requiring thick layers of mortar, pieces cut out of Tulppa board can be used as filler and support elements. The mortar must not be allowed to dry or the boards will not be bonded to the wall properly. The boards can be secured from their top edges using Tulppa Z brackets (and from the bottom board using O brackets) at 1300 mm intervals. The brackets are attached to both ends and to the centre of the board. If no brackets are used, it is important to support the boards (using bracing struts set against the opposite wall, for example) while the mortar is drying to prevent the boards from moving. Through holes and the 3 mm gap between the floor and the wall should be sealed using an elastic sealing compound, as for spar frame installations.
In all other respects, follow the instructions given for spar frame installation.