Aerated concrete is porous and soaks up the first coat, and moisture from such a wall has to escape outwards. At POLIFARB two facade paints list aerated concrete among their substrates: silicone SILIKON FASAD and rubber RUBBER FARBA.

SILIKON FASAD for house walls

SILIKON FASAD is a silicone water-based paint for first and repeat painting of rendered, concrete, stone, brick, aerated concrete and sand-lime brick facades. The film has high vapour permeability (class V1) and low water permeability (W3): the wall releases vapour while rain is kept out. Declared protection is over 15 years, and the coating can be washed with detergents 7 days after painting. Consumption is 150–200 g/m² per coat on non-absorbent surfaces and 180–220 g/m² on absorbent ones; aerated concrete takes the upper figure. Apply 2 coats with 2 hours between them over a primed surface. The paint is white with a TR base and is tinted in POLIFARB Color System or with COLOR MIX pastes.

RUBBER FARBA for plinths and outbuildings

RUBBER FARBA is an acrylic rubber paint with an elastic, vapour-permeable film. Its substrates include foam and aerated concrete as well as brick, render, slate and metal. It has wet-scrub class 1, a matt finish, ready RAL colours and a TR base. Apply 2–3 coats at +10…+30 °C, below 80 % humidity and on a surface of at least +5 °C; the coating reaches full strength after 28 days. It is not recommended for floors or steps.

Questions and answers

Which of the two for a facade?

For house walls that need to dry outwards, SILIKON FASAD with vapour permeability class V1. RUBBER FARBA suits jobs where the plinth, fence and roof are painted in one colour; see “Plinth and foundation paint”.

How soon after rendering can I paint?

Fresh render is painted with SILIKON FASAD no sooner than 3–4 weeks, concrete after a month.

Where can I read more?

In the article “Facade paint for aerated concrete, brick and slate”.