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I have an odd setup right now with my front deck; it uses steel triangles bolted to the foundation to hold the beams for my deck. A couple of them have let go and need replacing.

enter image description here

That steel is one of the brackets, but I’m planning to replace these with ledger board bolted to the concrete.

The only challenge I’m having is the best way to get the original floor height. Currently it’s two 2x6s tall, above the top of the steel bracket. If I put a ledger board there and set the joists on top of the ledger board, I’ll still be 5.5” too low.

Could I make a ledger board that is one 2x6 and one 2x12 (to get the height back to original)?

Here's perhaps a better mock-up of the design. The black horizontal line is the grade. The round column represents the helical pile. The 2x6 get the 2x12 out past the brick, and with the bottoms of the 2x6 and 2x12 flush I get 6" of rise that I can set the joists on.

enter image description here

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  • Those steel angle supports offer better support than only a ledge board would offer. How is the deck structure being supported in your new design? Oct 23, 2022 at 20:56
  • The problem is that those supports stick out 5’, forming a right triangle. At the tip of those triangles are the columns that support the roof overhand. Two of the brackets have already had their bolts snap off (plus using them isn’t too code anymore). My new design is ledger board on the house and helical piles support the beam under the columns. Oct 23, 2022 at 21:07
  • Oh another thing to mention is there’s only one bolt holding those brackets to the concrete and nothing fastens the beam to the steel. Oct 23, 2022 at 21:08
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    Because whatever I use for a ledger will have the same height as the top of the steel brackets. Currently a beam sits on the top of the brackets, and then joists on top of the beam. So the floor is 11” above the top of the brackets. The 2x12 is required for two reasons. One is because the brick fascade stick out 1” past the concrete, and two I need the extra height above the top of the ledger to sets joists on top of to get the right floor height. Perhaps I can do a better diagram. Oct 24, 2022 at 12:40
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    @FreeMan does the new diagram help explain what I'm trying to say a little better? Oct 24, 2022 at 17:27

2 Answers 2

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See IRC R507.9.1.3. There's a table for 1" of sheathing instead of your 2x6 spacer. If the 1" spacer is sufficient instead of your 1.5" spacer, then the table has a bolting schedule that you can use.

I suggest 2-1/2" wide chunks of wood at each bolt location so that any water that falls back there can escape or at least dry out.

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Don't use a ledger. Put in 2 helical piles near the house and put a beam across the top of them. Set joists on the beams. The joists can extend past the beam a bit. No water retention problem, not ledger twisting problem (which is a problem with your stacked proposal.) The deck will now be structurally independent from the house.

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  • The house typically provides the deck's lateral system. Without the ledger, it will need braces to prevent it from toppling. It looks like there's a potential alternative ledger spot against the house, but without a plan view of the deck's footprint, it's presumptuous to assume that the alternative ledger doesn't run along a very narrow width of deck (making it insufficient).
    – popham
    Feb 4 at 0:49

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