Builders Choice 1 in. x 2 in. x 6 ft. S4S Walnut Board (4-Pack) W1601026XX - The Home Depot

Wood Rot Dual Post Protection Ground-line rot, decay, fungi and moisture are the number 1 contributor to wood post failures and are found within the first 6 in. to 8 in. of earth surrounding in-ground posts. POSTSAVER fence post protector sleeves provide a locked-in air and moisture barrier and rot block protection for new wooden posts before installation. A POSTSAVER post guard is a heat-shrinkable sleeve with a thermoplastic bituminous interior liner, otherwise known as a dual wood post protective sleeve. Effectively it creates a water and air-tight seal when applied to new posts at the vulnerable ground-line level, making ground-line decay impossible. Unlike liquid coatings, a POSTSAVER wood post protective sleeve maintains its impenetrable post guard barrier, even as the wood post ages, cracks or splits. The POSTSAVER post guard sleeve's design comprises a dual layer of protection, a non-toxic plastic outer layer and an interior bituminous layer. Each layer offers a superior level of protection for the life of the post