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Plywood APA Rated Sheeting Cheat Sheet by

How to read APA Rating Label
apa     rates     sheathing     wood

Introd­uction

This common grade stamp is very similar to the Sturd-­I-Floor stamp we looked at, but it’s on a panel of rated sheeting. APA Rated Sheathing is intended for use as subfloor, wall, shear wall or roof sheathing. Typically produced with square edges, tongue & groove rated sheeting is available, but rare.

APA Rated Sheathing should be used for subflo­oring, walls, shear walls and roof sheathing.

RATED SHEATHING

 

48/24 – SIZED FOR SPACING

Two numbers separated by a forward slash indicate the span rating. The first number indicates the span for roof sheathing and the second for floor deck.

In this example, 48 indicates that this panel can be applied over roof framing members at 48 inches OC; 24 is the OC spacing for structural floor framing. Explan­ations for the Exposure 1 Rating, Thickness Label and Mill Identi­fic­ation Number are the same as in the previous example.

PS 2-10

PS 2-10 Perfor­mance Standard for Wood-Based Structural Use Panels. This is another voluntary standard initiated by APA, under Commerce Department proced­ures. The reference to PS 2-10 in the grade stamp indicates the product meets the requir­ements of the standard.

PS 1-09, written in 2010, primarily addressed plywood, while PS 2-10, written in 2011, has a broader focus and covers structural plywood, OSB and other mat-formed panels, as well as composite panels. The standard classifies panels by bond (adhes­ive), span rating, perfor­mance category and grade. It also specifies required product test methods and quality certif­ication programs.

PRP-108

The APA testing and quality control standard.
 

APA Rated Sheating

HUD-UM-40

This is the U.S. Housing and Urban Develo­pment (HUD) Building Product Standards and Certif­ication Program for Plywood and other Perfor­mance Rated Wood-Based Struct­ura­l-Use Panels. This five-page document basically says all structural wood panels used to construct HUD housing shall comply with APA PRP-108.

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