Foam concrete block – cellular hygroscopic construction material. These properties of stone need to be considered when drawing plaster coat on it. For finishing work with foam concrete block there are rules.
Features of stucco work with foam mortar
Walls from foam concrete block have very modest appearance therefore many house owners seek to plaster them. The main objective when performing finish coat on foam mortar is to create steamproof layer. Its purpose - in the free admission of moisture from within the room outside, but not on the contrary. Therefore plastering of such walls has the features. Rule of works with foam mortar following: the inside layer of plaster has to be exactly twice thicker, than external. Only in such a way it is possible to achieve optimum vapor permeability of walls.
How it is correct to plaster walls from foam concrete block?
For foam mortar there are special primers which will protect this hygroscopic material from emergence of fungus and mold and will provide its adhesion to finishing mortar. The optimum choice – Ceresit CT-1, Aquastop, "Betonokontakt", AEROC, "SILBET". Any of these solutions needs to be put in 2-3 layers, trying as it is possible to fill more carefully with the grounding structure all time of foam concrete block. In work it is desirable to use brush with rigid elastic bristle.
It is necessary to know that normal cement and sand solution quite badly sticks to porous concrete and over time by all means will peel off. Therefore it is recommended to use ready mixes as a part of which there are ingredients enhancing adhesion. It is "Dekor Highway-39" with filler from the synthetic reinforcing fibers; "Distances" - special structure for plastering of foam mortar; "PROFIT CONTACT MN"; Ceresit ST 24, at the heart of which the special cementing agent allowing to level qualitatively wall from foam concrete blocks; "Mix Mask" which part quartzite and polymeric modifiers are; ATLAS KB-TYNK - the most inexpensive and popular plaster mix. Process of drawing topping coat on foam concrete block almost differs in nothing from similar works with other materials. But the features nevertheless are. First, this careful multilayered priming of surface of walls as with external, and from the inside. Secondly, if construction stones are produced by method of casting, on them previously fix grid for stucco work. It without fail reinforce joints and cuts of blocks in window and door openings. Further prepare plaster mix according to the instruction and apply it on walls by means of the palette with wide metal cloth.