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Even if the wall is not brick, it is necessary to insulate through a brick wall. If the fireplace is massive, then it is necessary to install the foundation for it so that it stands firmly and reliably. It is also necessary to put waterproofing on the foundation. In order for the floor to be protected in front of the fireplace, it is necessary to execute the site in front of the fireplace by 50 centimeters and on the sides of about 30 centimeters. The depth of the fireplace is usually 50 centimeters, but this is solved individually.