This month, we'll begin a series that takes an in-depth look into all aspects of sheathing materials used in modern-day construction. In particular, we'll focus on the environmental concerns, thus complementing the "Déjà Vu x 2" series recently concluded, which examined alternatives for formaldehyde-based binders and substitutes for wood fiber in composite wood panel products. To begin this series, we'll take a look at the general characteristics, environmental impacts and purpose for sheathing.