The substrate really doesn't need to be all that thick, 1/2" will suffice. It's only there to absorb waste anyway and it's insulating the heat away from the tub right now. You can probably just stick with plain aspen, as the bark will keep the humidity pretty high.
For temps to be 92-94 in the tub, the thermostat will need to be set higher(97-99 degrees depending on your room temps) than that to achieve those temps. Keep bumping it up a degree and let it settle(20-30 minutes or so), until you reach 93-94.
Originally Posted by SatanicIntention
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