Got a deck question. Have a friend with a 16×24 deck. It has 2/2×10 beams sitting on 6×6 posts at 18″ from the house and at the outer edge. It is also lag bolted to the rim joist. Lag bolts go completely through the rim joist.
Posts are set on concrete footers which are 30″ deep. The posts are not bolted to the footers but rest on them with metal cleats mounted to the bottom of the post. Worked great for a year. Solid as a rock, he says.
However, after being up for a year, it shakes when anyone walks on it. The posts closest to the house appear to have shrunk, ot the concrete settled.
It appears to be structurally sound but not braced diagonally. Before the posts near the house shrunk I’m guessing that they provided diagonal bracing which no longer exists. I think that anyone walking near the outer edge of the deck has a 16′ moment arm with nothing to stop that movement. It’s not going to fall out or down, but there’s nothing to stop some sideways motion.
I’m not a deck guy, but I’m thinking he’s got two things to try: put Simpson standoff post bases on the post which have pulled away from the concrete and put two stainless wires for diagonal bracing with turnbuckles to tighten. That’s probably overkill but he doesn’t want it to shake.
Photos attached, forum friendly sized. Looking for advice.