Normally a roof span is the same as the building width between the outer edges of the wall top plates.
Roof architecture definition.
Roof terminology is also not rigidly defined.
Roofs have been constructed in a wide variety of forms flat pitched vaulted domed or in combinations as dictated by technical economic or aesthetic considerations.
They were usually set at a slope or pitch so that rainfall could drain off.
They can be arched or domed.
Usages vary slightly from region to region or from one builder or architect to another.
The vertical change in height per unit of horizontal distance or run.
Unit rise is a is a snonym for slope or roof slope.
A roof is the top covering of a building including all materials and constructions necessary to support it on the walls of the building or on uprights providing protection against rain snow sunlight extremes of temperature and wind.
Readers should see the additional photo and drawing guides to building architectural styles in the links listed at page top or.
The earliest roofs constructed by man were probably thatched roofs that were made of straw leaves branches or reeds.
The main factors which influence the shape of roofs are the climate and the materials available for roof structure and the outer covering.
The characteristics of a roof are dependent upon the purpose of the building that it covers the available roofing materials and the local traditions of construction and wider concepts of architectural design and practic.
A single flat sheet or a complex arrangement of slopes gables and hips.
Definition of roof span.
For example a 3 12 roof has a unit rise of 3 of height increase or rise per 12 of horizontal run or distance.
Roof covering of the top of a building serving to protect against rain snow sunlight wind and extremes of temperature.
Roof covering of the top of a building serving to protect against rain snow sunlight wind and extremes of temperature.
Roof shapes vary from almost flat to steeply pitched.
Roof shapes differ greatly from region to region.
A roof is part of the building envelope.