Wood will naturally shrink as moisture is absorbed and then evaporates. When such shrinkage occurs, there is no need to worry with the Oz-Post because it fully encapsulates the post and allows for drainage. OZCO recommends tightening the hardware 2-6 months after installation to assure the tightest connection or to use a small amount of polyurethane glue to create a strong connection without having to re-tighten screws. Wood shrinkage is a greater problem for fences installed in concrete because they hold water, which makes the wood rot. The Oz-Posts drain water well and separate wood from the soil, which protects against premature wood rot.