[Leo.G (Leo)]

James I was just looking at your image, I wasn't going to do anything quite as elaborate as that, just some loose weld mesh separated by spacers for 2 levels. I've noticed you've welded the rebar, did you have any trouble doing the welding?
I guess it's not so much structural and won't collapse or separate once buried in concrete but I do know unless purchasing the rebar with a stamped W (for weld-able) it's not an easy thing to do.
I guess I could tack it together because structural rigidity isn't required, I'll run some tacks on some 19mm stuff I have laying in the back yard and see how it goes, it certainly doesn't have to look pretty and I won't bother with preheating which I'd have to do if it were structural.


Always a pain when I don't do near enough welding despite having qualifications in fabrication engineering and Arc, MIG and AC TIG welders in the shed. It's a health thing and when I do want/need to do nice welds it takes me a while to get the feel, I do a lot of grinding. I never used to have to grind any of my welds but I was doing it frequently.....


EDIT:


Is there anywhere I can go to calculate the best size of reinforcing bar/mesh to use for a 600 x 600 x 600 cube of concrete?
I want to do it once, properly (though I've had the hole dug for over 12 months), Rome wasn't built in a day.