Thermal insulating plaster on concrete walls.

Structure type

Concrete external walls.

Detail

Interior or exterior thermal insulating plaster with its skim coat and finish.

Application cycle

1. Interior plaster (or exterior, if the thermal plaster is used indoors).
2. Cast-in-place or precast concrete wall or floor.
3. Bonding scratch coat of RALLK Muro K RA, applied at least 24 - 48 hours before the thermal plaster at a plastic consistency by plastering machine and left rough, without screeding.
4. RALLK Termo K thermal plaster, class T1 according to UNI EN 998-1, based on NHL 3.5 natural hydraulic lime and selected lightweight mineral aggregates with a maximum grain size of 3 mm, applied over the hardened bonding scratch coat, well bonded to the concrete, by plastering machine for pre-mixed products in one or more coats of about 4 cm each, until the thermal insulation required by current regulations is reached.
5. Reinforced skim coat with RALLK Rasante K, or alternatively RALLK K OttO, and embedded glass fiber mesh of more than 150 g/m².
6. Interior and exterior mineral finish with RALLK RasoColor K, applied with a plastic or steel float and finished with a sponge or plastic float until the surface is even and uniform, with no visible joins (or alternatively 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. Before using RALLK Termo K as an interior thermal insulating plaster, check that no interstitial condensation will build up in the wall.
2. Although not mandatory when the masonry has no discontinuities and the plaster thickness does not vary significantly, a skim coat with embedded glass fiber mesh (see step 5) 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/or minor settlement or movement due to uneven masonry.
3. RALLK RasoColor 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.
4. See the individual product data sheets for application methods and precautions.