1. Understanding the APA Grade Stamp

The stamp in the exhibit reads:

APA RATED SHEATHING 32/16

15/32 INCH (thickness)

SIZED FOR SPACING

EXPOSURE 1 (can handle temporary moisture exposure)

2. Meaning of "32/16"

The numbers 32/16 are the span ratings for the panel:

32 inches = maximum recommended span for roof sheathing (when applied perpendicular to

supports).

16 inches = maximum recommended span for floor sheathing (when applied perpendicular to

supports).

These ratings are established by APA (The Engineered Wood Association) based on panel thickness,

grade, and allowable loads/deflection limits.

3. Applying to the Question

The question asks specifically for maximum recommended span for use in a floor system.

From the stamp:

Floor span rating = 16 inches

Therefore, the correct answer is 16 in.

4. Why Other Options Are Incorrect:

A . 15 in — Not the value given; 16 in is the rating.

C . 32 in — This is for roof applications, not floor systems.

D . 108 in — Not related to APA span ratings; possibly confused with the certification number "NBR-

108."

5. NCARB ARE 5.0 PDD Study Guide Reference:

Content Area: Building Materials & Assemblies — Wood Products

Reference Sources:

APA – The Engineered Wood Association: Panel Span Ratings Guide

Building Construction Illustrated (Ching) — Plywood and OSB Panel Markings

IBC Chapter 23 — Wood span and application requirements