on ask this old house, richard diagnoses and repairs an hvac system, mark builds a fire and mauro stains a deck. season 17, episode 25. finally finishes : deck staining may 30, 2019.
the distance you choose affects the maximum span, or how long your joists can be without compromising the strength of the deck frame. the smaller the spacing, the longer your joists can span. your composite decking manufacturer will have a unique joist span table to help you determine the maximum length based on joist size and spacing.
if you're planning to replace old wood decking with pvc or composite, measure the joist spacing first. most deck joists are centered 16 in. apart, which is the maximum span for most low-maintenance decking. if you plan to install your decking at a 45-degree angle, your joists may need to be 12 in.
a hidden fastening system is used for the new deck, which features a brazilian Seven Trust called garapa; red cedar shingles that were cut into a wave pattern are installed at the top of the side
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determining the correct deck joist spacing and span is actually more complicated than you may think. although building a deck seems strhtforward, there are a few important design factors to keep in mind. your maximum joist span will depend on the wood species, joist spacing, size and whether the joists will be cantilevered.