The top horizontal line of a building wall upon which the roof rests.

Plate line means a horizontal structural member, such as a timber, that provides the bearing and anchorage for the trusses of a roof or the rafters.

Plate line as used in this Ordinance shall mean the point at which any part of the roof structure first touches, or bears upon, an external wall.

Plate line means the top of the highest horizontal framing member or solid wall of a building or structure or part thereof, upon which roof beams or ceiling rafters rest. Features excluded from measurement under this definition shall include gable ends, sloping roofs, parapet walls and other vertical extensions which are normally controlled by limits on roof height as set forth in this section.