Closing thoughts apa data file form no t325d provides updated fastener schedules for plywood and osb structural panel sheathing used for roof decks of steep slope roof assemblies.
Nailing 3 4 apa roof sheathing.
Roof fastening zone wind main sheathing to gable overhang velocity roof end wall framingg eaves 3 second panel 123 2 3 2 3 gust locationi fastening schedule inches on center supported panel 666 6 6 150 mphf g end and edges 3h panel field 6 4 3 4 3 supported panel 666 6 6 120 mphf g end and edges 3 panel field 12 6 4 6 4 supported panel.
Use shingle underlayment felt conforming to astm d226 type i astm d4869 type i or astm d6757 self adhering polymer modified bitumen sheet underlayment should conform to astm d1970 or check roofing manufacturer s.
Produced by apa the engineered wood association formerly the american plywood association in 1989.
Cover roof sheathing as soon as possible with roofing felt or shingle underlayment for protection against excessive moisture.
Use 8d common nails for panels up to 1 thickness.
Generally you ll need to place two nails at each location where it makes contact with a roof truss.
Other code approved fasteners may be used.
Always ensure your work site is compliant with current osha regulations.
2 4 common performance categories and corresponding span ratings performance category span rating 3 8 24 0.
Apa data file form no t325d can be downloaded from apa s web site.
This video may depict some work practices that do not meet current safety standards.
Avoid roof complaints with proper framing sheathing and roofing techniques.
2 3 materials apa rated sheathing panels are produced as plywood or oriented strand board osb.
At intermediate supports fasten panels 12 inches on center.
Use a 10d box nail to gauge 1 8 inch spacing between panels.
Fasten panels 3 8 from panel edges.
Fasten roof sheathing panels properly fasten panels with a minimum of 8d common 0 131 inch by 2 1 2 inch nails spaced a maximum of 6 inches on center at supported panel ends and edges.
Lumber width slats of wood used for roof sheathing are lumber boards with face widths ranging from 4 to 12 inches.
Region fastening in a 3 inch on center spacing using 10d ring shank nails is prescribed.
Spacer type panel edge clips may also be used for roof sheathing applications.
Typical size is 4 ft x 8 ft but other sizes may also be produced.
Commonly square edge but may be produced with tongue and groove edges.
For slats featuring face widths of 12 inches you will space three nails evenly apart about every 3 inches.
