enough to resist imposed loads. The frame design
itself and connection details can significantly
affect the required thickness of individual parts.
Thicknesses typically range from 23/32 inch to
7/8 inch, but panels can be manufactured in cus-
tom layups and thicknesses up to 1-1/8 inch.
Many manufacturers use different thicknesses in different frame parts. Others prefer one thickness, such
as 7/8 inch or 1 inch, throughout the frame. While
this increases material costs, it also reduces inventory
management costs and enhances frame quality.
The optimum thickness of a given part also can
be significantly affected by the overall frame design.
Highly loaded parts, such as front rails, can be
braced in a number of ways to reduce the thickness
reached. Frame-grade panels can also be engineered
to improve strength properties in the desired direction by changing the ply layup and grain orientation
of inner plies.
Specifying panels for furniture
APA-trademarked frame-grade panels are proprietary products. Each APA member manufacturer determines specific construction of their frame-grade
panels. This allows input into the engineering of panels in order to meet their particular requirements.
When ordering panels, specify proprietary frame-grade panels manufactured to the PS 1 or PS 2 Product Standards and desired panel thickness. Manufacturers and distributors can then help determine
the best panel to meet requirements. They consider
species, veneer grades (for plywood orders), number
of plies and ply layup requirements (for plywood
orders), and panel density (for OSB orders).
For additional information, visit www.performan-
Marilyn Thompson is the director of marketing and
communications for APA –The Engineered Wood Association.
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