Treated Pine Sleepers in the garden questions

Hi everyone
looking at using treated pine sleepers to build a raised vegie garden that doubles as seating. Been looking through the net and just wondering if anyone can clarify the following?
Is CCA still used on sleepers in Victoria?
Will the sleepers stand up to being moist on the soil side, dry on the other, would they warp? (Probably be using 2400mm x 50 or 70 x 200. Bed will be 2400 x 4800 and will be two sleepers high. Will sink similar sized sleepers into the ground with some cement to hold all the sleepers in place on the ends and in the middle where the 2 x 2400 sleepers meet)
Do they paint or stain okay, do they hold it well. If so what would be best, to paint or stain, any suggestions as to what products?
Also looking at making some bench seats up to 2400 long sleeper on top of two sleepers placed in ground and cemented as "legs". Any ideas of what the largest distance between legs I could do without it bowing on the middle?
Any other comments or suggestions or discussion regarding treated pine welcomed.
Cheers
Mcblurter

Gday

CCA - yep.
Dry/wet - OK if well secured to uprights at both ends & pref in middle of each sleeper too.
Fence stain would be the go I'd reckon.
Re the bench seat, I think the sleeper warping is more of a risk than anything else, it won't bow from the load of average people sitting on it.


Cheers.................Sean

See this thread for more discussion, & this search for lots more. :)


Cheers................Sean