Advances in room forming technology have created a trend toward construction of multi-unit shear wall structures. The availability of room forming systems is helping to bring down the cost of such structures to a level comparable with more conventional column and slab structures. Multi-unit shear wall buildings offer many advantages: the inherent strength of the design alleviates otherwise difficult structural problems in seismic zones; the density of concrete walls and slabs provides greater resistance to fire and to sound conduction, thereby contributing to a sense of privacy and peace of mind for the occupants; the structures provide greater resistance to moisture and seepage since there is no seam or joint between the walls and ceilings. These systems are designed to form a complete room monolithically. In addition to reducing time and labor costs, the forms produce a high-quality wall finish, which usually eliminates the need for finishing or plastering. The basic room form is an all-steel unit. Angles, channels or formed high-hats, spaced 6 to 12 inches on centers, are used as vertical stiffeners. Construction loads of room slabs with clear spans not exceeding 14 to 15 feet are efficiently transferred to the walls by diagonally braced horizontal stiffeners. A starter wall, poured monolithically with each successive slab, is essential to the function and design of most systems. The short starter wall serves as a precision locator for the placement of room forms, and results in factory-like precision of the structure. It also allows for a downward movement of the room from when releasing it from the slab above, and it transmits the concrete load to the bearing walls below. Depending on the forming cycle selected and the design of the system involved, room form units may be moved in either individual modules 2 to 8 feet in length, or in large gang sections up to 40 feet long. One system allows the contractor to fly a form gang of 1000 square feet or 15,000 points, whichever is greater. Where individual modules must be separated form one another on each pick, or where two gang sections are joined, most manufacturers provide a quick-release suitcase latch joint.