The Roofing calculator has equations and data items for roofs including trusses, roof area, roof sheeting, and shingles. It will even tell you how much snow weighs on the roof.
The roofing calculator provides simple calculations that are useful to roofers and homeowners. These equations include simple calculations for:
A gable is the generally triangular portion of a wall between the edges of a dual sloped roof. The shape of the gable and how it is detailed depends on the structural system used (which is often related to climate and availability of materials) and aesthetic concerns. The two most common applications of a gabled roof are using either roof trusses or roof rafters. Both translate the load (weight) of the roof material and anything laying on it (e.g., snow) across the open space of the building to the walls.
A variation of the gable which has a stairstep design to accomplish the sloping portion. Crow-stepped gables were used in and as early as the seventeenth century. Examples of the crow-stepped gable can be seen at and , both 17th century Scottish buildings. Other early examples are found in parts of Denmark and Sweden.
Gable ends of more recent buildings are often treated in the same way as the Classic form. But unlike Classical structures, which operate through , the gable ends of many buildings are actually bearing-wall structures. Thus, the detailing can be ambiguous or misleading.
Gable style is also used in design, with varying degree sloped roofs, dependent on how much snowfall is expected.
Sharp gable roofs are a characteristic of the Gothic and classical Greek styles of architecture.
The gable end roof is a poor design for hurricane regions, as it easily peels off in strong winds. When wind flows over a gable roof, the surface behaves like a wing. Lift is created on the top of the roof.