I'd like to make a large (1.5m3) wooden compost bin that's insulated to try to run the compost hot. My existing bins are crap and it just sits there slowly turning into mush despite turning and the bottom being open to drain.
I propose to use 2 layers with foam board in between (I have celotex offcuts/damaged pieces which would be ideal).
The base will be insulated too and I'll probably run a couple of perforated pipes through to allow some air to the middle.
The outer layer I think will be decking type wood - it looks nice enough, it's tough and simple to screw into a box shape with some batten at the corners.
Question is what to make the inside surface of? Same? WBP ply? Something else?
There'll be drain holes in the base to allow leachate to run off (doubt there'll be enough to bother collecting). It's going to (hopefully) get hot and steamy inside to the inner layer will be in a much harsher environment than the outside.
Obviously the concept of toxic preservative on the inner layer is a no-no.
Cheers
Tim