What is the Agencys position on the use of CCA to treat skirtboards and sillplates used in the post-frame construction industry?
As of December 31, 2003, CCA cannot be used to treat wood for skirtboards and sillplates in post-frame construction. The Agency has concerns about the possibility of this size dimensional lumber being diverted to other residential uses where the potential for exposure exists. Dimensional lumber is characterized as having the following measurements: two inches up to, but not including, five inches thick, and two or more inches wide (e.g., 2″ x 4″). There are a number of alternatives to CCA for this particular use currently available on the market (see Question 4 for examples of such alternatives).
