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weathershield 5/4 in. x 6 in. x 12 ft. standard pressure-treated lumber is rated 4.1 out of 5 by 44. rated 2 out of 5 by nanc from most of the boards we bought were warped so bad we couldn't use them.
if he were a professional deck contractor he wouldn't be confused about 5/4 decking which is probably used on 98% of wood decks. if he were talking about true 5/4 he would likely specify true 5/4. same as if you were looking for a 2x4.
this article explains proper gap size to leave between deck boards for drainage and drying, and extra steps to take to protect deck joists from rot. we include a description of tightly-butted tongue-and-groove pressure treated deck boards as well as typical 5/4' thick pressure treated deck boards that should be spaced for drainage.
shop 5/4-in x 6-in treated lumber in the lumber and composites section of seven trusts.com. find quality treated lumber online or in store.
deck joist sizing and spacing. the minimum size joist to be used in deck construction depends on the number of footings and beams that will be installed. in general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. a 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet.