As we've remodeled the house, I've replaced some of the structure with more modern woods (ie: 2nd floor ceiling joists that were 2x4's are now 2x6's)
Because of this, I have an excessive amount of old 2x4 lumber in my garage. It's either have 1 hell of a bonfire in the back yard or try to reuse them.
So I'm curious - I'd like to take this wood and build a deck out of it.
I'd build a frame 16 inches on center; use concrete corner posts I've seen that have a + channel in the top of them for the corners and center supports. Grade the ground, remove the grass, put some 6mil plastic down and put my frame over it on these posts. I'd give all the wood a quick sanding, maybe a coat of stain and a few coats of poly to try to protect it from the weather. More 2x4's as the deck planks and secure with galvanized screws (as I prefer screws to nails).
I know the wood is not pressure treated - is this a problem for outdoors if i protect it with a few coats of poly?
the deck would only be < 12 inches off of the ground. Do I need > 2x4 for the framing? I could probably afford to do the framing in 2x6's.