The Attachment at the Bottom is a PDF of the Vertical Structure Depths for Common Imperial Lumber sizes and LVL / TJI sizes at different Roof Pitches which I made recently with Forum Member "Chopsaw's" help  ( Thanks - 'cos Trig. ain't my thing ! ).    ( VSD is VRD in older versions of Chief )   VSD as defined in the Reference Manual :  The Vertical Structure Depth is defined by measuring a plumb line across the roof plane structure. The degree of pitch affects the