How is treated wood produced at Follen Wood Preserving?
We purchase dimensional Southern Yellow Pine lumber from local mills and bring it to our plant for treatment. The basic treating process is simple and highly controlled. (1) Lumber, timbers, or plywood is loaded onto small rail or tram cars. The trams are moved into a large, horizontal treating cylinder. (2) The cylinder door is sealed and a vacuum is applied to remove air from the cylinder and the wood cells. (3) Preservative solution is then pumped into the cylinder and (4) the pressure raised to about 150 pounds per square inch, forcing CCA into the wood. Treating time varies depending on species of wood, commodity being treated, and the amount of preservative to be impregnated.(5) At the end of the process, excess treating solution is pumped out of the cylinder and back to a storage tank for later re-use. (6) A final vacuum removes excess preservative from wood cells. The cylinder door is opened and the trams are pulled out. The wood is test for preservative penetration and retenti
