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Processes, machines, articles of manufacture and compositions of matter required to construct a habitable structure comprised of a cementitious product, preferably autoclaved aerated concrete (“AAC”), formed in unique blocks, panels and beams. This results in an extremely environmentally friendly ha

Processes, machines, articles of manufacture and compositions of matter required to construct a habitable structure comprised of a cementitious product, preferably autoclaved aerated concrete (“AAC”), formed in unique blocks, panels and beams. This results in an extremely environmentally friendly habitable dwelling, residential or commercial, which, due to the resultant synergy of embodiments, when compared to a similar structure employing prior art and/or current industry's standard materials and methods of construction, is structurally superior and simultaneously yields substantial savings in labor, time and costs.

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1. A stair system for an autoclaved aerated concrete structure comprising: a plurality of cementitious steps;each of said steps having two spaced ends;said ends having a top and a bottom edge;a pair of spaced side edges interconnecting said top and said bottom edges;a slot formed in each of said end

1. A stair system for an autoclaved aerated concrete structure comprising: a plurality of cementitious steps;each of said steps having two spaced ends;said ends having a top and a bottom edge;a pair of spaced side edges interconnecting said top and said bottom edges;a slot formed in each of said ends and extending angularly from said top edge to said bottom edge;a pair of elongated continuous support brackets secured to said structure;said support brackets being disposed parallel to and spaced from the pitch line of said steps;the angle of said slots being less than 90° and greater than 0° with respect to the horizontal plane and the vertical plane;said steps slidably disposed on said support brackets; andsaid support brackets disposed respectively in said slots. 2. The stair system according to claim 1 wherein said steps are further attached to said concrete structure by means of a screw. 3. The stair system according to claim 1 wherein mortar is placed between said stairs and said concrete structure. 4. The stair system according to claim 1 wherein said brackets are angular.