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Considerations involved in selecting a roof pitch include availability and cost of materials, aesthetics, ease or difficulty of construction, climatic factors such as wind and potential snow load, [2] and local building codes. The primary purpose of pitching a roof is to redirect wind and precipitation, whether in the form of rain or snow.
In building technology, researchers helped develop statistical means to identify snow and icing loads throughout the United States [45] and standards for measuring heat loss, [46] [47] roof moisture detection, [48] and frost-protected shallow foundations. [49]
Flat roofs may also need to be designed for live loads if people can walk on them. In the United States, building codes specify the loads in pounds per square foot which vary by region. The load and span (distance between supports) defines the size and spacing of the rafters and trusses. [4]
The physical geometry of a building affects its aerodynamic properties and how well it can withstand a storm. Geodesic dome roofs or buildings have low drag coefficients and can withstand higher wind forces than a square building of the same area. [1] [2] Even stronger buildings result from monolithic dome construction. [3]
A building code (also building control or building regulations) is a set of rules that specify the standards for construction objects such as buildings and non-building structures. Buildings must conform to the code to obtain planning permission , usually from a local council.
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An ice dam is an ice build-up on the eaves of sloped roofs of heated buildings that results from melting snow under a snow pack reaching the eave and freezing there. Freezing at the eave impedes the drainage of meltwater, which adds to the ice dam and causes backup of the meltwater, which may cause water leakage into the roof and consequent ...
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