Exterior plaster on porous clay block masonry.

Structure type

Load-bearing or infill external walls in porous clay blocks.

Detail

Application of exterior plaster.

Application cycle

1. Scratch coat on concrete ring beams and columns with RALLK Muro K RA bonding mortar, applied by hand or by plastering machine. Applied over the whole surface, it also regulates water absorption.
2. Machine-applied plaster RALLK Muro K PM, plaster made with RALLK Muro K M5 plastering mortar, or alternatively 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.
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. If needed, water absorption can also be regulated (see step 1) with a first coat of standard plaster, although a bonding mortar is still required on the load-bearing structures.
3. See the individual product data sheets for application methods and precautions.