Q.I am siding a building that
was framed and roofed two years ago and is sheathed
with 15?32-inch OSB. The building paper blew off one of
the gable walls, and now the OSB has turned gray and
some of the strands are lifting from the surface. Is
the OSB still sound as structural sheathing? I cut out
one of the window openings, and it looks like only the
top surface - less than 1?32 inch - is affected; the
rest of the panel is still tightly glued and has its
original color (see photos, below).A.Bryan Readling, P.E., an
engineered-wood specialist...