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Thanks for the info. So pressure treating/any other sealing/staining is not good for veg etc? The current ones are literally falling apart so I was hoping to replace them with something more weather/water resistant.
cjr-
Thanks for the info. So pressure treating/any other sealing/staining is not good for veg etc? The current ones are literally falling apart so I was hoping to replace them with something more weather/water resistant.
There is debate about this. I've seen forums where people argue about it all day. Brakeless, helmets, etc... Since I'm growing veggies for my family to much on I just choose to avoid the debate and get untreated wood. Cedar is notorious for its weather resistance, so this is what I use.
bright
I use cedar 1x6 inch deck boards for their longevity without toxic crap. I used cedar 4x4 sections at the inside corners. I use outdoor deck screws and a driver to fix the the boards to the 4x4.
I was able to find the cedar for a reasonable price thankfully, but if you're not careful it can feel like robbery.
It looks like you might need something a bit more robust than 1 inch deck boards, and for cedar than can be extremely (!) expensive and in many cases unavailable.
Douglas Fir has a good reputation also.
You can use pressure treated boards if you aren't growing vegetables, but some say this is up for debate. I wouldn't do it.
Finally, assuming there's nothing buried under your existing beds, I'd just turn the soil over (going deeper into the earth) after fixing them. if you build them taller you'll have to find soil which is harder and more expensive than it should be.