Skim coat over existing plaster on masonry with concrete beams and columns.

Structure type

External wall with concrete beams and columns and brick infill.

Detail

Skim coat over existing exterior plaster.

Application cycle

1. Scratch coat on concrete ring beams and columns.
2. Standard plaster, class CS I – CS III according to UNI EN 998-1.
3. Skim coat of RALLK K OttO or alternatively RALLK Rasante K with embedded 150 g/m² glass fiber mesh, laid from top to bottom with the vertical strips overlapping by at least 10 cm. The mesh must cover the whole surface or, alternatively, straddle the concrete load-bearing element, extending at least 30 cm onto the brickwork on either side of the columns and over more than one course of bricks at the ring beam. Meshing the whole facade is recommended for porous brick infill walls.
4. Finish with a finishing coat, RALLK Marmo K powder mineral finish or another mineral finish, acrylic, siloxane, lime or silicate paste finish, or lime, siloxane, acrylic or silicate paint, as set out in the specifications.

Additional information

1. Based on current site experience, a reinforced skim coat on fully cured plaster is an effective way to prevent hairline cracks in the plaster caused in the medium and long term by minor settlement, vibrations or thermal expansion.
2. See the individual product data sheets for application methods and precautions.