Best way to lay deck boards on exposed trusses?

jennifertail646 · 2026-06-08T19:37:52Z

Trying to figure out the smartest way to lay down decking on top of some exposed trusses (not solid joists, but open web steel trusses in my case). I’m a bit stuck on whether I need to add some kind of sheathing or blocking first, or if there’s a way to just attach directly. My main concern is flex and squeaks, plus making sure it’s safe—don’t want to step through a gap and end up with a story for the ER, you know? Also, do I need to worry about spacing for airflow or anything like that? It’s an outdoor setup, if that makes a difference. Anyone dealt with something similar, or have suggestions for what NOT to do? Would love to hear how others handled this, especially if you’ve got any “wish I’d known this” tips.

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Roof Decking Repairs & Wood Rot Replacement

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Metal flashing shims have saved me a few times, especially on older decks where nothing’s level anymore. I’ve also tried stacking composite shims, but they tend to shift over time. Honestly, I’ve found that if the trusses are too far gone, sometimes sistering a new joist is less hassle in the long run... not pretty, but it keeps things solid.

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Best way to lay deck boards on exposed trusses?

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