Know Your Sawdust

One of our goals as an urban sawmill is to use as much of a tree as possible, so we are very happy when sawdust is put to good use.  We produce a lot of excess and almost always have it available to the public as no cost.  Here are some great ways to use it and some info to keep in mind for your sawdust adventures.

Chemical Free

Whether you are using sawdust for compost or for your fancy hamster, you will want to make sure the wood it came from has not been weather proofed or pressure treated. An easy way to tell if you aren’t sure is by color, the chemicals are a transparent grey-green. If you come across saw dust made from this material make sure you dispose of it properly, it should never be dumped out doors. RE-CO produces furniture grade quality material, it’s au naturale  from start to finish, 100% chemical free.


You’re probably familiar with the warning label on snacks, “Produced in the same factory as peanuts”. You should keep this same warning in mind when using sawdust from a facility that works with Black Walnut. While it is a beautiful material with a distinct dark color,  it contains a compound called juglone, which stunts growth and can kill plants and animals. It can be used to this compounds advantage to kill weeds in sidewalk cracks or to contain plants to a certain area. Black Walnut can be used in a compost because as it decomposes juglone neutralizes.

Tim adding to our black walnut sawdust pile
Tim and a Black Walnut saw dust pile

Compost and Garden Beds

Compost is a great option for getting rid of sawdust because it returns the material to the earth and produces a mineral rich compost. Fresh sawdust is acidic, it takes about a year to decompose and neutralize the harsh stuff before using it in the garden. Nitrogen rich material, or “green” material like grass clippings and kitchen waste makes up the majority of a compost mixture. The “brown” material, like sawdust or dead leaves will add carbon and balance the nitrogen. You can compost all year long, even in winter because as your compost breaks down it makes it’s own heat as i breaks down.

The fact that the decomposition process creates heat opens up another interesting composting opportunity.  You can leverage this reaction to heat water and create methane gas.  The underrated Frenchman, Jean Pain, is a pioneer in this technique.  By circling pipe through a compacted, well planned and maintained compost pile, you can transfer the compost heat into water or anti freeze to use in your home.  A simple system could pump water through the pipe and would come out warm on the other side.  A more permanent system could pump an anti-freeze like glycol in a loop between the compost and a boiler to heat the water in the boiler.  Our co-owner, Dan, intends to experiment with this system at his home in the future and  will update this blog with the results!

Sawdust can also be used as mulch or on pathways in the garden and yard.


Sawdust can be used as a cleaning agent when a rag or sponge isn’t up for the task. This is why Katz Deli keeps a layer of sawdust on their bathroom floor! Where else can you use the stuff?

  • Kitty Litter: This is a great alternate to kitty litter because it’s economical and non toxic, it doesn’t clump but is easy clean up.
  • Oil Spills: Oil spills are unseemly on the garage floor, but are also hazardous to living things. Sprinkle sawdust on the spill and let absorb for several minutes. Shovel into a seal-able bag and dispose of in accordance with your city.
  • Old Paint: Trying to dispose of old latex paint can be a pain because it takes so long to dry, sawdust can expedite the drying process. In a dry and well ventilated space, seal a cardboard box with packing tape then dump 6″ of sawdust in the bottom before pouring in the old paint. Stir up then repeat, add more sawdust then more paint. Let dry completely before tossing.

Stove Heating

Have a pellet stove?  Why not make your own pellets with excess sawdust!  Small scale wood pellet mills are affordable coming in around $2000 and can produce over 200lbs of pellets an hour.


Now just give us a call at 347-770-5002 or email us at to get your free sawdust today!


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