How to build a concrete foundation

You will need
  • - cement M400;
  • - sifted river sand;
  • - rubble stone of medium and large sizes;
  • - building level;
  • - trowel;
  • - scrap;
  • - Plumb;
  • - tape measure;
  • - cord.
Instruction
Clear the plot chosen for the construction of a house by removing rubbish, grass and bushes from it. Mark up the foundation of rubble stones using the �two arc� or �Egyptian triangle� method. Place the pegs in the corners of the future house and stretch an inelastic cord between them. Dig a trench 70 cm deep. Carefully level the bottom of the trench. Knock down formwork from boards 2.5 cm and install it in the trench.
Put sand on the bottom of the trench. Lay it in layers of 5 cm with tamping water from a hose. The total thickness of the �cushion� should be 20�25 cm. Close the sand with one-layer roofing felt. Pour the cement mortar, prepared in a 1: 3 ratio, in a 15 cm layer, on top. Wait until it hardens.
Place another 25 cm thick layer of concrete over the resulting solid base.Wait until it thickens slightly. Press into the concrete half rubble stones. They can either dial in the vicinity, or purchase from some construction company. The stones in the layer should not touch each other. Lay them 3-4 cm apart.
Pour another layer of concrete mix and push stones into it. Continue the procedure until the concrete foundation reaches the desired height. Place the stones in such a way that the finished structure looks like a clutch. In the corners, use large rubble material. In the uppermost layer, immerse the stones in the solution not half, but completely.
Align the top plane of the ribbon to level. A day after pouring the foundation, remove the wooden formwork. In the next two weeks, spray the bottle with water twice a day. This will prevent the formation of surface cracks on the tape.


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