The entrance will be quite heavy, so it needs good support.

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Next, we need to proceed from the fact that 320 kg of M400 cement is needed to prepare one cubic meter of concrete mix. Knowing that the solution is prepared in a ratio of 1 to 3 to 5, we can calculate that approximately 1000 kg of sand and 1600 kg of crushed stone will be needed. If you build a semicircular porch with your own hands with the dimensions given above and on three steps, then its total volume will be 1.2 m3. This means that it will require a total of 384 kg of cement, 1200 kg of sand and 1920 kg of crushed stone. These figures were obtained by multiplying the volume of the porch by the employment data amount of materials. It is worth considering that concrete mortar will also be needed for the foundation.

Preparatory stage

The preparatory stage is one of the most important when building a semicircular porch with your own hands. The area is carefully cleared of various debris and plant remains. It is necessary to remove the top layer of turf to make it easier to make markings. It will be more convenient to work on a flat area, so it can be partially leveled using a rule. After preparation, you can start marking. The size of the lower step is already known, to draw a semicircle of the required size, you need to take a strong rope, the length of which will be equal to the radius of the lower circle. The rope is fixed at a point that will correspond to the middle of the door. Reinforcement or a small wooden block is tied to the opposite end of the rope. Using such a simple device, a semicircle is drawn from wall to wall. It will indicate not only the lower step, but also the foundation of the entire structure, as in the photo below.


A pit is dug with a width of 30 cm. It is necessary to go down to a depth of at least 70 cm. The best solution would be to build a foundation for the porch to a depth below the freezing of the soil. At the bottom of the resulting pit, a 10 cm thick layer of crushed stone is filled. It is leveled and the same layer of sand is laid. The sand must be well compacted and leveled. Additionally, it can be moistened so that the load is subsequently well distributed over the material. For better waterproofing of the structure, roofing felt can be laid on the bottom and walls. A mesh is made of metal reinforcement, which is laid in the pit. In this case, it must be slightly raised, installing it on supports. This is necessary so that the solution is also below the structure, an example is shown in the photo.