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Fire and sound ratings for building systems utilizing gypsum wallboard are dependent on the core type and thickness of the wallboard, its application in conjunction with the component parts, and the manner in which it is applied. Tests for fire resistance and sound transmission, performed by independent laboratories, have resulted in specific ratings for walls/partitions; floor/ceiling assemblies; shaftwalls, stairwells and area separation walls; and columns. For maximum fire resistance and sound control, double layer construction is generally recommended since the additional mass further retards heat and noise penetration. Gypsum wallboard can be installed to both metal and wood framing using nails, screws or adhesives in combination with nails or screws. In many instances, the application will dictate which fastening method is appropriate. Control joints may be necessary to prevent cracking in the gypsum wallboard facing of drywall systems, especially in areas where structural elements such as slabs, columns or exterior wall can bear directly on non-load bearing partitions. To relieve the stresses which occur as a result of movement induced by changes in moisture, temperature or both, control joints are required in both partitions and ceilings |
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