Cooling Tower Lumber
Cooling towers are subjected to the harshest environments conceivable. The wet-dry cyclical conditions and structural designs intensify the undisciplined seasoning of the wooden members, resulting in warping, twisting and checking.
Most large process cooling towers have a wood structure (typically Douglas fir or redwood) encased with fiberglass siding. The outer surface of the lumber is treated with a preservative chemical to prevent fungal attack that might lead to internal rot.