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Maximum Height
The maximum height of an unblocked shearwall has increased from 2.44m to 4.88m, as per the change in 9.4.4.
Height-to-width Ratio
The maximum height-to-width ratio for unblocked shearwall has been reduced to 2:1 from 3.5:1, as per the new limitation in 9.4.4. An item has been added to the Design Settings output echo to show the ratios for blocked and unblocked shearwalls (despite the fact that this has been removed from the design settings choices, see Program Operation change 104 below.)
Unblocked Vertical Sheathing
When the vertical orientation of sheathing is selected, blocking was disabled and unchecked, but the program treated the wall as blocked because of the assumption that the edges of a 4x8 sheet are supported on the studs and bottom and the top plate. Given the new height requirements, the program now allows you to specify whether vertical sheathing is blocked or unblocked.