Problem 8.13

 

Exposure durability classifications

 

Product Standard PS 1 

1. Exterior -- panels have a fully waterproof bond and are designed for applications subject to permanent exposure to the weather or to moisture.
2. Exposure 1 -- panels have a fully water-proof bond and are designed for applications where long construction delays may be expected prior to providing protection, or where high moisture conditions may be encountered in service.  Exposure 1 panels are made with the same exterior adhesives used in Exterior panels.
3. Exposure 2 -- panels (identified as Interior type with intermediate glue under PS 1) are intended for protected construction applications where only moderate delays in providing protection from moisture may be expected.
4. Interior -- panels are intended for interior applications only.

(from Grades and Specifications - APA)

 

Product Standard PS 2 

1. Exterior -- similar to PS 1
2. Exposure 1 -- similar to PS 1

(from PS 2-10, Performance Standard for Wood-Based Structural-Use Panels)