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The two types of wall are load bearing, which supports the weight of floors and roofs, and nonbearing, which at most supports its own weight. The load-bearing wall of masonry is thickened in proportion to the forces it has to resist: its own load, the load of floors, roofs, persons, etc., and the lateral forces of arches, vaults, wind, etc., that may cause it to crack or buckle. Its thickness often can be reduced at the top, because loads accumulate toward the base; in high buildings this is done by interior or exterior setbacks at the floor level of upper ...(100 of 24717 words)