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FAQ

How to properly make an elevation on a single-layer cellular concrete masonry wall with narrow joints?

Such type of wall, due to its accurate construction technology, is very precise with little deviation from plane. This, in theory, allows to apply very thin layer of plaster, even 2 to 3 mm thick only. Sometimes, thermal insulation adhesives covered with acrylic plaster are used. Such solutions, however, are inappropriate and may lead to problems and disappointment. The elevation plaster is expected to have several basic functions:

protects mechanically cellular concrete which is itself a soft material,
provides hydrophobic barrier for rainwater preventing absorptive substrate from moisture penetration,
allows steam to diffuse out of the wall (“wall respiration”).

The solution based on cement adhesive and acrylic plaster meets none of those requirements. It fails to provide sufficient mechanical and hydrophobic protection and reduces partition diffusion, which may lead to steam condensation inside, and a resultant reduction of thermal insulation capability and also, quite often, plaster flaking. On the other hand, there is no reason in using conventional multi-layer plaster on such an even substrate. The best solution is to use a single-layer plaster mortar intended for absorptive substrates which is the ALPOL AT 312 white lime and cement plaster. That plaster, designed specially for such applications, applied in a single coat 10-12 mm thick, without any intermediate layers, provides an excellent fine substrate to be painted with permeable silicate (ALPOL AF AF 660) or silicone (ALPOL AF AF 680) paint. It is also possible to apply textured thin-layer silicate silicone or mineral plaster on such surfaces.

List of ALPOL products related to that question.

AF 660 - Silicate façade paint

AT 312 - White lime-cement plaster for machine application

AZ 115 - Thin-layer masonry mortar for cellular concrete, grey

AZ 116 - Thin-layer masonry mortar for cellular concrete, white

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