I just tore off the decking of a 5 year old deck. The decking was 5/4 and yes on 16" OC's. I walked the deck between the joists and the deck did bounce.
She hated it.
I tore the 5/4 off and laid 2x6's on and she should never have any problems.
I space my joists 16 OC even with 2x6's and have heard that a non bounce deck with 5/4 should be on 12 OC. What a waste of money in extra joists.
BC, I just have not had good luck with 5/4 and my compadres down here would not touch it either.
Here are a few dollar material figures per square foot that I have adhered to and do work.
Wolmanized Treated Wood $3.50 a square footRedwood Heart Wood $7.00 a square footCedar $6.25 a square foot
Trex is more than redwoodVinyl is more than trex
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