I made a ventilation duct in the wall from aerated concrete. Understood why they are laid out of bricks

I started laying the inner wall of the bathroom on the second floor. This wall is not load-bearing and could be made of blocks 150 mm wide. But I decided to continue it with the same width as on the first floor - 200 mm. I do this only because of the ventilation duct, which rises from the first floor.

It can be seen that the ventilation duct runs inside the wall. To do this, I mark each block and drill a hole in it with a crown. I bought a bit for brick and concrete with carbide taps with a diameter of 120 mm. The plastic ventilation duct itself is 100 mm in diameter. For a bathroom, the diameter is sufficient.

Crown with fixation in a perforator chuck (like a drill). I tried to drill with a drill, holding it in a chuck. But the crown is not centered, there is a runout and the power of the drill is too small for drilling of such a diameter (you will see this in the video below). Somehow I drilled one hole. Then he drilled with a hammer drill in the "drill" mode.

You go through the hole for the ventilation channel with a crown in stages. I drilled it to its height, chipped off a part with an old chisel - I continued to drill further. It didn't start to work out right away. The two blocks split. I glued them with glue foam.

I decided to cover the ventilation duct with a plastic ventilation pipe. Pipe cost - RUB 150 / r.m. Docking node - RUB 40 Not so much money, but there will be no dust in the ventilation duct, it is more difficult for dirt to settle on the walls of plastic compared to aerated concrete.

It happened that the ventilation duct fell on the edge of the block. And then he made cuts and chipped off the inner parts. In the masonry, two such blocks are joined to the left and right of the ventilation duct.

In the block of the last row, I made a hole with a turn at 90 degrees. I put my knee in here. This will be the beginning of the second floor bathroom ventilation duct.

A short roller with the highlights of the block drilling process:

I saw this idea of ​​laying ventilation ducts in a wall made of aerated concrete in this video: https://youtu.be/EQNtIbE2-Dk But he did not cook home-made devices, but drilled with the acquired crown. Yes, a little longer. But it will come in handy later.

And now on the topic of the title of the article. Why do many builders make ventilation ducts the old fashioned way - they are laid out of bricks? Firstly, this is how it is shown on most projects, and this is how houses are still being designed. Secondly, for many builders, the speed of work or additional familiar work (like laying a brick) is important, which have an understandable cost.

Fiddling with markings, drilling holes is more technologically advanced. Not all bricklayers have a crown and a hammer drill. They are not needed in aerated concrete masonry. For many, this is like an incomprehensible piece of jewelry that has never been done. On which you spend time and earn less.

Another reason: simple aerated concrete houses that are built without a project do not have ventilation at all. This is considered to be heat loss. At most, they will slightly open the window to ventilate the smells.

The process of laying such a ventilation duct together with the wall is not quick, I confirm this. I spent more than a week laying two partition walls, working in the evenings and on weekends. Ahead is the laying of another inner wall, where there will be a ventilation duct from the kitchen.

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