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The best foundation – concrete or rubble concrete. In dry soil can be made of bricks, using lime, cement or lime-cement mortar. Lime mortar is prepared from slaked lime and sifted sand, taken in the ratio from 1:2 to 1:3. Cement mortar (ratio of cement and sand have traditionally 1:3) is prepared in small portions, so as to have time to apply it to seizure. To prepare the well-known Covo-cement mortar charge of 1 hour 1.2 hours of cement lime and sand in 6-16 hours depending on the brand of cement and fat content of lime. The surface of the foundation is poured cement substance, tone down the strip on the level and covered with waterproofing, traditional or Toll ruberoid in 2 layers.
Grate grid set slits along the firebox. Between the edges of the grid, and in brick masonry leave a gap of more than 5 mm for the expansion of the grid. The gap is filled with sand. Such is the gap left between the slab above the firebox and masonry.

The interior surfaces of ovens should be smooth, because chipped and rough hewn bricks, put faces outwards. Every 4-5 rows of masonry inner surface of the erasure mochalnoy brush or cloth dipped in water without the addition of the solution.
Checking the correctness of the angles. Oposlya laying the first row validates the corners with polygon or cord. Oposlya stacking the 2 nd series set at the corners of the furnace guides cords with cut off. Cords hang nails to the ceiling and the bottom is wound on the nails, pressed into the seams between the lower 2-name series.