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- Before starting a wall construction it is necessary to prepare a dressed board on which unit height and length modules are marked for further control. The length of the board must correspond to the height of the future wall.
- Check the evenness of the base. Where the base or the floor structure is not even, they must be levelled with mortar.
- Place the insulation stripe over the surface prepared for construction which is 150 mm wider than the wall thickness.
- Construct at the temperature of +5oC to +30oC, it is not allowed to perform the construction at a temperature lower than 5oC. When constructing during winter, mortars must be with additives against freezing. Moreover, harder mortars are to be used.
- Upon completion of works, the stonework must be protected from cold and impregnations by covering with blankets or panels. During the construction it is difficult to avoid precipitation or sun heat, which is why units must be covered or moisturised. Hollow parts in units and thin walls do not absorb much humidity and also dry much quicker.
- Units must not be frozen, dusty, greasy or otherwise polluted.
- First of all, units are placed at corners covered with mortar, levelled horizontally and vertically and correctly oriented in accordance with the distribution of grooves. To fill in the gap along the length of the wall it is necessary to use half-units which must be available in complete sets of materials. Where they are not available, they must be cut using disk or chain saws. In the event of a small crack, it must be filled in with heat insulation mortar to avoid the formation of the cold bridge through the stonework. It is not advisable to chop units.
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- At the exterior of the wall corners connect units with a tense construction rope and continue laying them along the rope over fresh mortar pushing them together closely. Units are connected through grooves without mortar. The mortar layer of the horizontal seam is laid through the entire thickness of the wall without gaps. If agreed with the construction specialist, it is possible to cover the layer with gaps saving mortar and improving heat insulation properties of the stonework. Such a way is possible where the static stonework calculations allow doing so. It is the best to use heat insulation mortars which have good heat properties and are sufficiently resistant to compression.
- Level the unit row with a rubber hammer along the entire length. Remove the excessive mortar with a plastering trowel. To reduce the penetration of rain into wall, it is necessary to use good-quality mortars. Mortar fillings must be no thicker than 2 mm. Seams between units at the façade side must be thickened (up to the depth of 20 mm).
- The vertical gap between units is not filled in with mortar. Units are connected through grooves avoiding cold bridges.
- When constructing a triple-layer wall, the air gap between the heat insulation material and the finish stonework must be kept the same, no less than 40 mm. Wall surfaces in the air gap must be even. Mortar sticking out of seams must be removed because the rain water through mortar bridges may get into the heat insulation layer. To connect wall layers in between, use metal connections protected from corrosion or fibreglass.
- Mortar used must be of such consistency so that it would not flow into hollow parts of units. Before laying another layer of mortar, the upper part of the previously laid units must be dampened; if they are very dry after the summer season, all units in the package must be dampened.
- Unit layers must be constructed so that vertical gaps would overlap chequerwise, by at least 95 mm.
- Check regularly whether the construction rope is tensed accurately. Control the stonework vertically with the help of a spirit-level, and the height of layers – with the help of a board prepared in advance.
- The unit stonework is constructed in accordance with the height module of 250 mm, which is determined by the unit height of 238 mm with the seam thickness of 12 mm. To construct a 1 m high wall 4 layers need to be laid. Where the height of the premises (up to the floor) does not correspond to the module, there is a smaller or a larger gap which must be filled in with a row of bricks, cut units or concrete by filling in the points of connecting the floor structure.
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