We built this beautiful two-level deck in June 2015. It's a wood composite by TimberTech...awesome product with a 30 year warranty.
Earlier this year this homeowners notice that the boards moved up creating a slight trip hazard.
They called us and after our inspection we determined that it was a 2x10 deck joist (wood) that swelled up. We lowered the joist and put it back together in minutes. Easy fix.
We've built a few decks on this strip of river and ALWAYS enjoy the scenery.