Finish coat on rubble stone masonry.

Structure type

External walls or partitions in rubble stone (or alternatively solid brick).

Detail

Interior or exterior marmorino-type trowelled mineral finish on plaster based on natural hydraulic lime (or alternatively hydraulic binders) applied to rubble stone or solid brick masonry.

Application cycle

1. Interior or exterior plaster.
2. Mixed stone wall (or alternatively solid brick).
3. RALLK Muro K class M5 plaster based on NHL 3.5 natural hydraulic lime, applied in one or more coats (a scratch coat followed by browning coats) until the surfaces are even, or alternatively existing hydraulic binder plaster.
4. Reinforced skim coat with RALLK Rasante K nhl and embedded glass fiber mesh of more than 150 g/m².
5. Troweled interior or exterior finish with RALLK Marmo K, applied with a steel float and polished with a flexible steel spatula until the surface is even, smooth and silky, or has another desired look (or finish with a finishing coat, powder 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. Although not mandatory when the base plaster has no cracks, a skim coat with embedded glass fiber mesh (see step 4) is strongly recommended: based on current knowledge and site practice, it is the only effective long-term way to prevent hairline cracks in the finish caused by thermal expansion and minor settlement or movement due to uneven masonry.
2. On existing plaster, check that it is cohesive and well bonded to the wall, and free of dust, salt efflorescence, mold, soot, other organic material, oil, grease or anything else that could impair the bond between the skim coat and the plaster.
3. On cracked existing plaster, check the cause and stability of the cracks.
4. For cracks wider than 2 mm, once they have been confirmed as stable and NOT structural, we recommend filling them first with RALLK Marmo K, applied with a spatula, 12 - 24 h before the skim coat.
5. RALLK Marmo K is compatible with any acrylic, acrylic-siloxane or siloxane protective, consolidating and/or water-repellent treatment recommended for the exposure or use of the treated surfaces.
6. See the individual product data sheets for application methods and precautions.