Purchasing spawn to inoculate large scale woodchip piles

Has nyone used spawn and woodchips to create soil over time? and if so what types of decomposers work well in northern climates? We ahe lots of chips andnot much top soil? I'm thinking this is a good strategy to build soil. Has anyone had success with this?
J

I always recommend king (or winecap) stropharia for these kind of projects. I've had great success with this species. It eats almost all hardwoods, as well as Douglas-fir chips, and probably other conifers as well. It does a great job converting wood chips to soil, is easily transferred from one pile to another and it tastes pretty good. It is native to the Mid-Atlantic states, so it can probably overwinter in northern climates. Try Field and Forest Products out of Wisconsin for spawn. (fieldforest.net) Good luck!!