Thermo-spruce has knots and grain and costs less than thermo-aspen. It gets the same heat-and-steam treatment, so it stays flat. A common pairing is thermo-spruce on the walls and ceiling with thermo-aspen benches, which is how Thermory builds its own barrels. Ben Burger sided his farmhouse in wide-plank thermo-spruce. Free samples on any Thermory board page.

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