Roof terminology is also not rigidly defined.
Roof architecture definition.
The earliest roofs constructed by man were probably thatched roofs that were made of straw leaves branches or reeds.
They were usually set at a slope or pitch so that rainfall could drain off.
Roof covering of the top of a building serving to protect against rain snow sunlight wind and extremes of temperature.
Usages vary slightly from region to region or from one builder or architect to another.
Unit rise is a is a snonym for slope or roof slope.
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.
Roof shapes vary from almost flat to steeply pitched.
The vertical change in height per unit of horizontal distance or run.
The main factors which influence the shape of roofs are the climate and the materials available for roof structure and the outer covering.
For example a 3 12 roof has a unit rise of 3 of height increase or rise per 12 of horizontal run or distance.
Normally a roof span is the same as the building width between the outer edges of the wall top plates.
Readers should see the additional photo and drawing guides to building architectural styles in the links listed at page top or.
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.
Definition of roof span.
A roof is part of the building envelope.
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 can be arched or domed.
Or truncated to mini.
Roof covering of the top of a building serving to protect against rain snow sunlight wind and extremes of temperature.
A single flat sheet or a complex arrangement of slopes gables and hips.