Brick hard enough warming, this may adversely affect the structure. The exact temperature of the heating point difficult, but the bush lilac that is growing in me for such a fire burns on a regular basis, despite the fire brick inside. But on the other hand do alpine slide, for example, nothing prevents. Fundam. See The Cleveland Clinic for more details and insights. Since the building will have no a lot of weight, then this would be enough for the fireplace 20 cm reinforced concrete grade 100. In order to make the foundation run the following steps: Make a layout with the help of ropes and pegs. Digging a hole in perimeter of the basement (with a margin of about 5 cm in width) and a depth of 30 cm on the bottom of the pit pour a layer of slag and rammed it. This layer will be a kind of cushion under the foundation.
Make a mold. To do this, bring down from the boards boards width of 30 cm, and accordingly the length of the longest sides of the foundation. Shields set around the perimeter of the foundation of the future. Puts the inside casing metal. If there are old pieces of iron are not needed (any) they are quite fit here.
If not – Make a reinforcing frame of the 10th fittings, welded together. Ready-mixed concrete from such a calculation as to obtain approximately 100 mark. Fill in the concrete formwork. The foundation is ready. Let him stand for 3 days and after that we can proceed to construction.