Topic: how to prepare a wooden base

[sawfish]

I'm going to be screwing my greenhouse to some scaffold planks I got from a mate (nuff said) and I want to make them last as long as possible.

What should I use as a preservative to increase its life as its going to be next to the earth? It would have to be a non toxic substance.

[petengade]

Can only think of Cuprinol, used Cuprinol treated scaffold boards for gravel board for my fence in contact with the earth 16 years ago, they are rotten now. I used old bricks to build a wall to stand the GH on, they will last for ever.