- Q.Most sheathing
manufacturers recommend that panels be spaced at the
edges andends. Since panels measure a full 4x8 feet,
the only way I’ve been able to provide this
spacing (and maintain standard joist and stud layout)
is by trimming the ends and edges of the sheathing
panels. Why don’t manufacturers size the
panels 47 7/8 by 95 7/8 inches?
A.Ed Keith responds:
The APA, as well as most panel manufacturers,
recommends 1/8-inch spacing at the edge and end of
panels. APA manufacturing standards are designed to
accommodate this spacing by permitting a full
1/8-inch plus-or-minus tolerance on the length and
width of sheathing panels. Many manufacturers do,
in fact, cut their panels a little short and
narrow. While the amount of cutback varies among
manufacturers, it’s typically 1/16 inch.
Why not a full 1/8 inch? The 1/16 inch may be a
compromise to avert rejected panels that are too
short or out of tolerance.
Ed Keith is a senior engineer at APA - The
Engineered Wood Association in Tacoma,