Walls made of ceramic and silicate bricks and blocks as well as of cellular concrete blocks. Walls and ceilings made of concrete and concrete elements. Old, not weathered cement-lime plaster.
The substrate must be clean, sound, dry and free from dirt, dust and greasy spots. Clean old and sound plaster of paint coats, open the cracks, patch irregularities and pits with ALPOL AZ 130 quick-setting or ALPOL AZ 135 levelling mortar. Strengthen weak surfaces with ALPOL AG 700 deep-penetrating primer, treat highly absorbing substrates with ALPOL AG 708 primer for absorbing surfaces or apply a scratch coat of ALPOL AT 303. Moisten dry substrate with plenty of water before applying the scratch coat. Treat concrete surfaces with ALPOL AG 702 primer or apply an initial scratch coat of ALPOL AT 303. In spots where cracks can be expected to occur, such as different materials one next to another and opening corners, apply reinforcing glass fibre mesh with mesh size at least 8 x 8 mm, embedded in ALPOL AZ 130 quick-setting or ALPOL AZ 135 levelling mortar or directly in the plaster. When applying the plaster on a substrate coated previously with a scratch coat of ALPOL AT 303, allow at least 2-day process break, and, before plaster application, moisten the surface along with the scratch coat using water.