staining a deck

Welcome to HR, Wintersedge. If the deck is new, then yes, wait a year for it to dry sufficiently. If the deck is too wet, the stain won’t penetrate properly and you’ll be stuck with a mess and a waste of money. If the underside is high enough for people to walk under and see it then yes. Just buy a cheap garden sprayer, and spray the underside. It will save time and since it is not exposed to the sun will hold up well.
The top sife, use rollers and brushes to get good penetration. Don’t forget to power wash first, both top and bottom to remove grit and grime before you stain any of it.

-- Methods are many,Principles are few.Methods change often,Principles never do.

Thanks for the advice!

I made that mistake. I thought leaving it for a few months would be adequate. While the stain has taken for the most part, I found the stain worn away at the ends of the boards this spring. DOH! Good thing I still have a can. I’ll wait until fall before I reapply.

-- Mike - Minimum code = Barely adequate.

Yes, it is generally recommended to wait for about a year before staining a newly built pressure-treated deck. This allows the wood to fully dry and stabilize, ensuring better absorption asp.net training in kochi of the stain. As for staining the underside of the deck, it is not necessary from a structural standpoint, but it can provide added protection and aesthetic appeal if desired.