I'm making raised beds for my vegetable garden and for obvious reasons can't use pressure treated lumber. I was thinking of using 1x10s, but cedar or redwood are not in my price range. does anyone know of anything I could do to treat pine that won't leach into the soil and kill me? also, I have a ton of the original siding from my house (built in 1948) up in my attic. it's about 1" thick and 8" wide and I have it in lengths of 8-10' long. It's been painted on one side, and I'm not sure what kind of wood it is. does anyone know if old siding is historically treated w/ anything nasty to make it fire resistant or age better? and would the paint pose a potential problem? the wood is in good shape, but I'm not sure how safe it would be to use. any thoughts?