Using a centuries-proven process of heat and steam, thermorized wood is modified from its traditional state to a wood that has been stabilized and more resistant to rot without losing surface hardness or strength. Available in both ash and pine as well as multiple finishes, deck boards are end-matched with patented technology that allows two planks to be connected between joists (see photo). Thermorized wood will silver like a typical hardwood, but is able to be maintained as its original chocolate brown with regular oiling.