Reasons for the demolition of an unfinished aerated concrete house on mortarless masonry

Masonry of aerated concrete on glue-foam with application on vertical and horizontal edges of blocks is becoming an increasingly popular technology for the construction of walls. This is understandable: the speed of laying increases, there is no wet work, there is no cold seam at all. And the type of masonry is much more attractive than the seams covered with mineral glue.

It would seem that any team and self-builder can immediately start using glue-foam. But this technique contains many subtleties, "pitfalls" that can lead to irreparable consequences - the demolition of the house. An example in this video:

A few photos of this process before and during the dismantling of the walls:

This is the place under the window lintel, where in such an uneven seam in thickness there will be additional fracture deformations. Foam glue is compressed, it does not bear the load, unlike mineral glue. And in the place where the thickness of the seam changes sharply - a crack is formed. The house will not fall apart, but cracks in the plaster are an unpleasant fact. The builders decided not to risk it and decided to dismantle the walls.

So what's the builder's mistake? If the masonry is applied to glue-foam, then the horizontal surface of each row of masonry must be brought out “into the horizon” with a float. And with a float, not on the basis of nail plates, but on the basis of coarse sandpaper (H100). Although I do not use glue-foam (or rather, I use it only for vertical seams), I use this grater:

And those places in which there were the greatest differences in the height of the blocks (errors in their geometry) - I check with an aluminum trowel 2 m long.

The builders had to do the same. But these are not all problems in the masonry shown in the video. After the arrival of the Technical Supervision and their conclusion, it was decided to dismantle the unfinished floor. During the dismantling process, it turned out that the blocks were dusty and the glue-foam adhered to them very weakly. And in places where the seam was thick - the foam broke easily, the block was detached from the masonry without serious effort.

Blocks broke off on impact. It was after watching this video that I gave up the option of putting the blocks completely on glue-foam.

It would be possible to dismantle the unfinished floor by hand using a cable saw with a small cable diameter (like a two-handed saw). Or simply cut the foam in the masonry with wire. Then clean, sand the blocks and use them again in work. Or to advertise and there would be those willing to come and dismantle and pick up these blocks in 1-2 days. But the builders reacted to the demolition barbarously - they called in an excavator and destroyed the walls with a bucket:

According to information from the builders, dismantling the unfinished floor, they lost almost 400 thous. rub. And they could only lose 250 thousand.

This article is by no means anti-advertising of aerated concrete or glue-foam. You just need to take into account all the subtleties of the new technology and do everything efficiently, as for yourself, think over every step in the work. Or control every step of the hired builders.

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