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Wood Structural Panels
For wood structural panels, you can select from list of standard interior and edge spacings, or select Unknown and the Shearwalls design routine will cycle through the possibilities. If the CSA O86-14 or CSA O86 -19 design code is selected in the Design Settings, you can also type in your own spacing.
Edge spacing
The fastener spacing for panel edges, used for shear wall shear resistance. It also affects the calculation of the nail slip component of shear deflection. Spacings of 2", 3", 4", and 6" are available for selection (50, 75,100,125 and 150 mm) . Edge spacing is limited to a minimum of 2" (2") and maximum of 150 mm (6") by O86 11.3.2.3.
Interior spacing
Also called "field" spacing, the fastener spacing for the interior of panels. It is used for component and cladding nail withdrawal design, and for the unblocked factor for shear wall resistance and for deflection. Spacings of 2, 4, 6, 8, 10 and 12" are available for selection, (50, 100, 150,200, 250 and 300 mm). Interior spacing is limited to a maximum of 300 mm (12") by O86 11.3.2.3.
Gypsum Wallboard
Edge spacing
For gypsum wallboard you can select from list of standard edge spacings, or select Unknown.You cannot type in your own spacing. The edge spacings are from Table 11.4 for gypsum wallboard shear resistance; they are 4", 6" and 8" (100,150 and 200) mm. They have no other effect on design or deflection analysis.
Interior spacing
Interior fastener spacing for gypsum wallboard has no effect on shearwall design or deflection analysis, and CSA O86 provides no guidance or limitations. Shearwalls offers one choice of 300 mm (12") interior nail spacing. You can change this value if you want.