stiffening a structure

[Jack]

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I have a 20' x 12' deck, attached to the house with a 20' ledger board. The opposite (long) side is up on four 3' posts. Needless to say, if I push along the 20' axis, there is significant movement back and forth.

I can run diagonal bracing from the bottom of the posts up to the inside of the ring, along the outer 20' dimension. What other approaches can I use to stiffen up the structure?

I plan to use lattice along the bottom front, fashioned in some manner to let it swing outward - in order to allow access underneath the deck for storage. So the diagonal bracing isn't the best solution for me.

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[mark Ransley]

What is Swaying, The posts or deck joints. Reinforce the weak link. your deck should not sway. Remember the deck collapes in CHICAGO ? Your Deck support must be solid, or it may fail under weight. I think your supports and construction are a stupid joke, fix them , before you kill people.....call a pro,. or better yet , the city inspector... Someone Was a REAL HACK, If it was You get Pro Advise and follow it, Either way you screwed up, by cheaping out

[Java Man (Espressopithecus)]

This is a good solution, and if it fits the structure under you deck, will stiffen the deck very well.

Rick

[Jeff Wisnia]

The reason I suggested a pair of 16 footers was that I solved for the hypotenuse and thought the OP might have trouble finding a 24 footer and getting it home by himself. A pair of 2 byes in a vee shape should handle his problem quite well.

Jeff