Hints for creating a foundation

It's like everywhere. The details are the problems and casting a foundation is no different. The professional execution determines the quality of the foundation and thus the stability of the structure, which will be erected afterwards. When you consider how much water is contained in the liquid concrete, you realize that it must escape again during curing. It only serves to initiate the chemical processes in the cement and then has to evaporate. If the concrete is not compacted during filling, this leads to countless air bubbles and thus to voids that affect the strength of the foundation.

Step 1: the mixture

If you mix your foundation concrete yourself, use 3 to 9mm gravel and Portland cement. Mix in the ratio 3: 1 and do not trust the advice that 6: 1 consider sufficient. Do not use masonry sand, which is recognizable by its yellow color. He is too loathsome and does not guarantee good quality.
Add only enough water to make the concrete earthy. If you keep a shovel full of concrete at an angle of about 30 degrees, it must not run down.
You can safely proceed if you use precast concrete from the mixer. He has always tested, high quality, which exceeds your mixture by hand.

Step 2: concreting

Fill the concrete in layers of maximum 15cm. Then the compacting follows with a handstamper or in narrow places with a squared timber. In the case of a strip foundation, you fill the concrete in continuous levels in this way. Do not interrupt the concrete work. Applying a layer to already hardened concrete does not create any connection and your foundation is not sustainable at these points.

Step 3: the topcoat

For surface foundations, smooth the surface with the trowel or with a floor plate with the concrete puller. This work forms the basis for your further work. Always keep the surface moist for the first three days.

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