FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

9 DESIGNING THE BUILDING Volume II
EXAMPLE 9.1. ROOF SHEATHING NAIL SPACING FOR WIND UPLIFT (concluded)
• For framing at 24 in. o.c., roof suction loads on a plf basis is:
• Nail spacing:
Rounding down to next typical spacing value, specify 3-in. spacing
Note: Edge zone nail spacing associated with Zone 3 OH pressures is conservative for other edge zone
locations. Although increased nail spacing may be calculated for an edge zone away from the building
corners, it is recommended that the same nailing schedule be used throughout all edge zones.
9.1.2 Roof Framing to Exterior Wall (Link #2)
Link #2 is the connection between the roof framing member (truss or rafter) and the top of the wall below
(see Figures 9-6 and 9-8) for resistance to wind uplift. Metal connectors are typically used where uplift forces
are large. A variety of metal connectors are available for attaching roof framing to the wall. Manufacturers’
literature should be consulted for proper use of the connector and allowable capacities for resistance to uplift.
Prescriptive solutions for the connection of the roof framing to the wall top plates are available in building
codes and wind design standards. One method of sizing the connection between the roof framing and the
exterior wall is provided in Example 9.2.
Figure 9-8.
Connection of roof
framing to exterior wall
(Link #2)
9-8 COASTAL CONSTRUCTION MANUAL