‘Sized for Spacing’ on APA Trademark
Plywood like all wood products, will expand or shrink slightly with changes in moisture content. If the wood structural panels are tightly butted, there is no room for expansion and buckling can occur.
APA recommends a 3mm (1/8-inch) space between panel edge and end joints and its panels may therefore be produced slightly less than the specified length or width.
It indicates this on its trademark by the words ‘Sized for Spacing’. This tells the customer that the panel may be slightly less than the traditional nominal 1220mm (48″) by 2440mm (96″). Standard panels tolerances are + or – 3mm (1/8”).
This is done to facilitate proper panel spacing and not to circumvent manufacturing tolerances.
Click here for APA’s Technical Topic on the tolerances allowed by each US standard. Also, see examples of APA trademarked panels for APA Rated Sheathing, APA Rated Sturd-I-Floor and APA Rated Siding trademarks.