Structural Flakeboards and Composites 29 1 5 



Roof sheathing application. — The major panel axis (the long dimension) 

 shall be placed across supports spaced no further apart center-to-center than the 

 panel span rating, and panels shall be continuous over two or more spans. Panels 

 at overhangs shall not have upper surfaces permanently exposed to the weather. 



Panels 1/2-inch in thickness or less shall be fastened with 6d common nails; 8d 

 nails should be used for thicker panels. Nails should be spaced no more than 6 

 inches apart along panel edges and 12 inches apart at intermediate supports, with 

 minimum edge distance of 3/8-inch. Other fastening systems that provide equiv- 

 alent product performance may be used. 



Panel end joints shall occur over framing. Panel end joints should be spaced 1/ 

 8-inch and panel edges 1/4-inch, unless otherwise recommended by the panel 

 manufacturer. Panel edge clips should be used at midspan of unsupported edges 

 for 7/16-inch and thinner panels rated only for roof sheathing and installed over 

 supports spaced 24 inches center- to-center. 



Subflooring application. — As with roof sheathing, the major panel axis 

 should be placed across supports placed no further apart than the panel span 

 rating, and panels shall be continuous over two or more spans. A separate 

 structural finish floor or underlayment shall be installed over the subfloor. 

 Nailing procedure is the same as for roof sheathing except that nails should be 

 spaced 10 inches center-to-center at intermediate supports. Joint spaces should 

 be the same as for roof sheathing. 



Wall sheathing application — Panels with a rated wall span of 16 inches or 

 roof span of 16 or 20 inches shall have a maximum stud spacing of 16 inches 

 center-to-center. Panels with a wall or roof span rating of 24 inches, shall have a 

 maximum stud spacing of 24 inches. Panels may be installed with the major 

 panel axis either along or across the studs. All panel edges shall be nailed to 

 framing for wall sections acting as bracing. Nailing procedure is the same as that 

 for roof sheathing. Joint spacing should be the same as for roof sheathing. 



Structural performance. — When tested by procedures of American Ply- 

 wood Association Test Method S-1 for concentrated static and impact loads, 

 panels shall conform to criteria of table 24-5. When tested by procedures of 

 Ameican Plywood Association Test Method S-2 for uniform loads, panels shall 

 conform to criteria of table 24-6. When tested by procedures of American 

 Plywood Association Test Method S-3 for wall racking, panels shall conform to 

 criteria of table 24-7. When tested by American Plywood Association Test 

 Method S-4 ultimate lateral and withdrawal loads for nails in panels shall 

 conform to criteria of table 24-8. 



