Gypsum composition and building construction

Claim 1

AN IMPROVED LIGHTWEIGHT MONOLITHIC POURED GYPSUM ROOF AND FLOOR CONSTRUCTION HAVING A PLURALITY OF SPACED ROOF AND FLOOR SUPPORTING MEANS HAVING A VERTICAL WEB PORTION AND SUBTENDING FLANGES, FORMBOARDS DISPOSED BETWEEN SAID SUPPORTING MEANS AND SUPPORTED AT THEIR MARGINAL PORTIONS BY THE SAID SUBTENDING FLANGES, AN OPEN RETICULATED REINFORCING MEANS OVERLYING SAID SUPPORTING MEANS AND FORMBOARDS AND SPANNING THE SPACES BETWEEN THE VERTICAL PORTIONS OF THE SUPPORTING MEANS, AND A SET GYPSUM OVERLYING THE FORMBOARDS AND ENCASTING THE REINFORCING MEANS AND VERTICAL PORTIONS OF THE SUPPORTING MEANS TO ENCASE THE SAME AND BONDED THERETO IN A MONOLITHIC STRUCTURE, THE SET GYPSUM COMPOSITION BEING COMPRISED OF AN ADMIXTURE OF WATER AND A DRY GYPSUM MIX CONSISTING ESSENTIALLY OF CALCINED GYPSUM, FROM 0.25 TO 5.0 WEIGHT PERCENT PORTLAND CEMENT ON A CALCINED GYPSUM BASIS AND FROM 2 TO 6 CUBIC FEET OF PERLITE AGGREGATE PER 100 POUNDS OF CALCINED GYPSUM, SAID ADMIXTURE FORMING A GYPSUM SLURRY FURTHER CHARACTERIZED IN HAVING A SET TIME OF UP TO ABOUT 35 MINUTES.