Simple installation of formwork for an armored belt made of OSB sheets without helpers

Armopoyas is a necessary structural element in the walls of a house, in which there are floors. It is necessary to distribute the load from the rafters. And in the case of slab floors, it is strictly necessary.

On the walls where the floor slabs will rest, I decided to mount a removable formwork from OSB sheets from the inside (they are easy to mount alone, unlike boards). And along the edges of the slabs, the armopoyas will be poured into a fixed formwork made of U-blocks of aerated concrete (glued from cut to 5 cm).

The width of the armopoyas on the walls, where the slabs will rest, is 25 cm (the height of the entire armopoyas is 20 cm). Armopias 20 cm wide in the side parts and on the inner walls.

Armopoyas, with a height of less than 15 cm, is not recommended to be done - it stops working as intended.

I purchased seven OSB sheets for the removable formwork. In a store (in an open warehouse) they were cut into sheets of 80 cm wide. Price example:

In place, I cut them in half by 40 cm.

All walls of the first floor (except one) are load-bearing. OSB sheets were screwed to aerated concrete with long 92 mm self-tapping screws - 8 pieces per sheet in two rows. The main thing is not to crank them in aerated concrete. Therefore, the drill is not suitable (rpm too high). It must be screwed in with a cordless screwdriver to control the force.

At the top and at the corners, the shields were pulled together with bars. The seams between OSB sheets were reinforced with 25 mm pieces of board. Ideally, you need two transverse bars per sheet (plus bars at the seams). And tighten the corners more securely. I didn't think it through, I hoped for the reliability of OSB, and in some places the sheets deviated from a straight line by 1 cm. Not critical. When pouring, the formwork was never pulled out of the aerated concrete.

I mounted OSB sheets immediately according to the level. To do this, I pulled a nylon mooring thread from corner to corner. And then the concrete was poured flush with the edge of the sheets. The first photos show this thread.

There will be a roof (or balcony) above the terrace. To fix the beam to the wall, I drilled the outer part of the formwork from 100 mm of aerated concrete and inserted the pins. I screwed the nuts inside - it just won't vomit.

I wrote about reinforcement cage earlier - reinforcement with a diameter of 10 mm. The square of the frame is approximately 16x16 mm. Frames of 6 mm smooth reinforcement are installed every 40 mm.

Someone will say that formwork from OSB sheets is more expensive than from a board. But it must be borne in mind that it is very difficult to mount the formwork from a 50 mm board alone. I would say it is impossible. Then the boards will get wet, they can bend when drying and will be in concrete. For further use, they need to be cleaned, stacked and pressed.

OSB sheets are quite moisture resistant and durable. Easy assembly and disassembly of the formwork by one person. And the most important thing is the reusable formwork, which is useful for filling the terrace, porch, balcony and staircase. Takes up little storage space.

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Photos of the author (c)

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