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Roof Height for Vertical Force Distribution (Bug CSW7-7)
The height hn for the highest floor used for vertical force distribution as per NBC 1995 4.1.9.1 (13) (now NBC 2005 4.1.8.11 (6) ) was using the eave height of the roof, rather than the mean roof height. It now uses the mean roof height.
Snow Mass on Flat Roofs (Bug 1645)*
Snow mass was not accounted for when building mass was generated on a structure in which all roof blocks are set as a flat roof.