Reply To: Moisture content for workbench build?
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Store it in your workshop for a week or two to acclimate. Cut to rough size and let it rest for a week or two more. Assuming you don’t get wild winter / summer variations in temperature and humidity it should be pretty stable by then. How you design the workbench, and construct the joinery will allow you to compensate for movement if you really think it will be a problem.
You can always put a sacrificial sheet of hardboard over the top to help even things out in case you don’t feel up to a bit of planing to level it out after its been set up for a while.
My workshop can vary between 25-30 C in the summer with the doors open and 5C in the wet / cold winter with the door closed and an electric radiator running. My workbenches are made with man made boards in a torsion box design, so I don’t suffer too much with movement. This is more because I keep trying new designs in cheap material, that end up being quite robust, rather than through any specific design intent.