That’s a good question. I believe if you used very small screens on a tub grinder you would be able to get a fine product for your houses. Check with a local equipment dealer who knows something about tub grinders (or horizontal grinders) and see how small of a screen you can get. You may also be able to find a used tub grinder which would save some upfront costs, as well. If this is something there is a need for in your area, you could also become a producer of the fine sawdust material and recoup some of your costs.