I have recently had a large bonfire, about 5 cu M of material ... consisting of a mix of sawn wood - pallets, offcuts, etc. some conifer trimmings, old roots, and a few pieces of OSB particle board.
About 10% of the wood was tanalised timber.
All reduced down to a barrow full of ash ... now the big question is do I dump this, compost this, or add it to garden.
