Coastal and Floodplain Construction Inspector's Practice Exam

Is 15/32 inch oriented strand board permissible for roof sheathing?

1. True

2. False

3. Only in some jurisdictions

4. It depends on the application

The correct answer is: True

The thickness of 15/32 inch oriented strand board (OSB) is permissible for use as roof sheathing according to many building codes and standards, provided that it meets certain structural and performance criteria. In general, the International Building Code (IBC) and the International Residential Code (IRC) often specify minimum thicknesses for roof sheathing based on factors such as the roof span and the type of roofing material being used. 15/32 inch OSB is commonly accepted as suitable for light roof applications, particularly in residential construction, when the appropriate spans and loads are considered. This thickness provides adequate stiffness and strength for typical roofing conditions. However, it is essential to ensure that the OSB is rated for the intended use and that it complies with local building codes which may vary. If these criteria are met, then using 15/32 inch OSB for roof sheathing is generally acknowledged as permissible. The other options revolve around conditions or limitations that may not apply broadly or could lead to unnecessary complications regarding the approval of this material in standard situations, which is not the case with the standard acceptance of this thickness in many jurisdictions.