There are two methods used to identify APA plywood panels:
APA trademarked panels may be produced in two bond classifications – Exterior and Exposure 1. The bond classification relates to moisture resistance of the glue bond. Since aesthetics (non-structural) attributes of panels may be compromised to some degree by exposure to weather, APA installation recommendations are designed to provide optimum overall performance.
Glue Bond durability classification of the panel does not relate to fungal decay resistance of the panel. Fungal decay of wood products may occur when the moisture content exceeds 20 percent for an extended period.
This denotes the maximum recommended centre to centre spacing of supports in inches over which the panel should be placed with its strength axis across two or more supports. The span rating can be displayed in one of two ways:
A term used to classify the species used to manufacture the plywood panel’s face and back under US Product Standard PS1 – Structural Plywood. Suitable species are classified into 5 groups based on their bending strength and stiffness. Group 1 species are the strongest and Group 5 species being the weakest.
Thickness and Performance Category on the panel need to be viewed together, with Span Rating info.
The words ‘SIZED FOR SPACING’ is often found on APA Rated Sheathing, APA Rated Sturd-I-Floor and APA Rated Siding trademarks indicating that the manufacturer has produced the panel to a size slightly less than the traditional nominal 2440mm (96″) by 1220mm (48″). This is done to facilitate proper panel spacing during construction. The use of this notation is not a manufacturing requirement but is sometimes added as a courtesy to the customer.
Spacing between ends and edges of adjacent panels helps prevent buckling due to panel expansion caused by moisture absorption. The recommended spacing between panels is 3mm (1/8″) at both the end and edge joints, unless otherwise recommended by the manufacturer.
This indicates that the APA panel has a tongue and groove profile on its two long edges which is to an APA approved pattern. This eliminates the need for support (blocking) under adjacent panel edges to prevent them from deflecting independently of each another when load is applied. The material removed to create the tongue normally reduces the width of the panel by 12.5 mm (1/2″), therefore the net width of tongue and groove panels is typically 1206mm (47-½”).
APA plywood is manufactured to two US standards:
The last two digits of the US product standard number indicate the year in which the standard was most recently approved.
This shows that the panel was manufactured to meet the performance requirements of APA’s Performance-Rated Panel Standard PRP 108. Performance standards do not prescribe by what means the panel is produced but the objective is to assure that the panel will satisfy the requirements for a particular end use application. This is similar to the performance-based approach taken by European Standards.
There are three classes for concrete form panels:
The classification is based on the grade of veneer used for the panel faces in combination with that used for the inner plies.
This is only applicable to panels specifically manufactured as APA 303 Rating Siding. These are panels used for cladding the outside of a variety of building types from domestic dwellings to garden sheds. The 303 Siding Grade indicates the number and type of repairs on the face of APA 303 Siding (external cladding) e.g. 303-6-S/W.
|303||APA’s siding manufacturing specification|
|-6-||maximum number of repairs allowed on the face of a 2440mm (96″) by 1220mm (48″) panel. The allowable number of repairs is proportional for other sizes|
|S/W||indicates the type of material used for the repair|
This refers to the APA code number awarded to each producing mill.