Deck "expense" - repair or improvement?

[Jake Shoupe]

Pulling my hair out on this...I have no idea which to classify this as. Sure I can be safe and treat it as a capital expense, but I don't know if it makes sense to.

We have a small rental property with a huge deck. We replaced the flooring and railing but all of the core structure remained. The cost was just over $6k just because it's so large. The flooring was deteriorating so we replaced it and the railing was also in very poor condition.

Thoughts?