The kiln-drying process drives most of the water out of cedar lumber. This results in significant shrinkage from the original green state, but less shrinkage than with many other species. Green cedar contains at least 25 percent water, while kiln-dried lumber contains between 6 and 15 percent water.

Is decking kiln dried?

A kiln is essentially a low-temperature oven used to dry wood used for decking. The lumber is placed in a chamber where the temperature, humidity, and airflow is monitored and controlled for optimum results while the wood dries.

How long does it take for cedar to dry out?

Leave the cedar logs in place for 18 months to cure. Mark and measure any cracks in the wood on the individual sections. Over time, the crack will widen slightly, and new cracks will form. Keep note of the width and depth of the cracks during the curing process.