High-capacity kilns

As part of the conversion of a log into finished lumber, lumber is often dried as one of the steps in the manufacturing process. Drying of the wood is done because lower moisture content affects lumber in several beneficial ways. The lumber weighs less, meaning more lumber can be loaded onto a truck, resulting in a lower delivered cost. Dry lumber is less likely to develop stain, decay, mold or insect problems. A lower moisture content also makes wood more stable and more likely to stay straight and flat. It helps prevent shrinkage and checking after the lumber is in use. Kiln drying also allows the lumber to more readily accept chemical treatment (see Treating).

To remove moisture from freshly sawn lumber, the wood can be left to equalize naturally through air drying. Alternatively, lumber can be placed in a dry kiln. In our dry kilns, temperature, humidity and air flow are controlled. All Pine Forest Lumber Company mill S4S products are high-temperature kiln-dried. A minimum temperature of 180 degrees Fahrenheit sets the pitch and allows us to heat treat (HT) stamp all material.

All 2” and 4x4 material is kiln-dried to under 19% moisture content to provide stability. All 4x6 and larger material is kiln dried to 25% moisture content.

The Lake City, Michigan mill is TPI Mill #752.