Roof Diaphragm Nailing Schedule

For the same nail spacing design loads on a blocked dia phragm are from 1 1 2 to 2 times design loads of its unblocked counterpart.

Roof diaphragm nailing schedule.

Diaphragm and shear wall perimeters interior openings areas of discontinuity re entrant corners. Ridge vents when the roof sheathing is used as a structural diaphragm as it typically is in high wind and seismic hazard. Reduce fastener withdrawal capacity unless 3 inch nominal framing is used and the nailing schedule is staggered. These construction systems can be used when designing a building for lateral loads such as those generated by wind or earthquakes.

Tab shingles need two nails on each side of the tab. The term diaphragm is usually applied to roofs and floors. Except where noted for exposure b enclosed buildings roof framing spaced 24 inches o c. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively.

A shear wall however is a vertical cantilevered diaphragm. Or less 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. Above which increased nailing will not increase capacity. Roof and wall sheathing 8 10d every 4 6 on the seams and 8 12 in the field shingles six roofing nails or staples per shingle.

A diaphragm is a flat structural unit acting like a deep thin beam. Diaphragm boundary all edges of a diaphragm shall be supported by a boundary element. Chords drag struts collectors shear walls frames boundary member locations. In addition the maximum loads for which a blocked diaphragm can be designed are many times greater than those for diaphragms without blocking.

1 inch 25 4 mm. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. Ridge vents when the roof sheathing is used as a structural diaphragm as it typically is in high wind and seismic hazard areas the structural integrity of the diaphragm can be compromised by a continuous vent see figure below left. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7.