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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You’re spot on about the slope—learned that one the hard way myself. I used to think a perfectly flat deck was the way to go, but after a couple winters here, I ended up with warped boards and a slimy mess. That little bit of pitch really makes a difference, even if it’s barely noticeable. And I totally agree on the flashing; it’s not magic, but it does buy you some time. Funny how the details you barely see end up saving the most hassle down the road.

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Best way to lay deck boards on exposed trusses?

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