Hi, I am a definite newbie as far as raised beds go. I've read some threads on railroad ties versus treated lumber, and I have heard pros and cons. The question I have is, in zone 5, if you would use regular, non-treated lumber, and use lag screws or nails, how long will that lumber last before rotting out????? Is that the best method? I want it to be attractive, yet functional. If I paint the outside for looks and protection, how soon will it rot on the soil-side??? Thanks a bunch!