Abstract: Embodiments of the present invention generally relate to sheathings generally used for building structures. More specifically, embodiments of the present invention relate to vapor-permeable, water-resistant, surface-treated sheathings having a drainage plane. In one embodiment a sheathing comprises a plurality of core layers, a first and second surface layer, each defining an exterior surface of the sheathing, and a plurality of adhesive layers, each disposed between each of the plurality of core layers, wherein the sheathing comprises a permeability rate of at least about 5 perms, and an absorption rate of less than about 15% water-by-weight.

Abstract: Embodiments of the present invention generally relate a method and apparatus of non-abrasive mechanical relief of a cellulose sheet to allow for uniform radius bending. In one embodiment of the present invention, a mechanically relieved sheet comprises a sheet comprising a cellulosic material and having a first surface, and at least a notched section on the first surface of the sheet comprising a plurality of indentations, wherein the first surface of the sheet is substantially free of visible cracks, wrinkles and abrasions.