Roof pitch Relates to the slope and inclination angle of a roof in building construction. A roof is considered pitched with a gradient greater than 15 degrees. Look up Slope in Wiktionary, the free dictionary. ... Duquesne Incline, Pittsburgh, Pennsylvania with full length parallel tracks A funicular, also called funicular railway or inclined railway, inclined plane, or in England a cliff railway, consists of a system of transportation in which cables attach to a tram-like vehicle on rails to move it up and down a... A roof tiled in imitation of thatch at Croyde, north Devon, England Rooftops in Vietnam Snow on the roof The roof, the top covering of a building, is one of the universal structures found on all buildings. ... Construction on the North Bytown Bridge in Ottawa, Canada. ... A grade (or gradient) is the pitch of a slope, and is often expressed as a percent tangent, or rise over run. It is used to express the steepness of slope on a hill, roof, or road, where zero indicates level (with respect to gravity) and increasing numbers correlate to... A degree (in full, a degree of arc, arc degree, or arcdegree), usually symbolized °, is a measurement of plane angle, representing 1／360 of a full rotation. ...

Carpenters frame (build) rafters to pitch a roof. A roof's pitch is the measured vertical rise divided by the measured horizontal span (not the run). Roof pitch is typically expressed as a rational fraction. Having twice the rise for the same span, a shed (lean-to, single or mono-) pitched roof has twice the pitch of a gable (double or dual-) pitched roof.^[1] Having two gradients, what most people call a "pitched roof" is correctly a "double pitched roof". Mono-pitched roofs have one gradient. Gable (and other split opposed-slope pitched roofs) allow for shorter primary structures with a corresponding conservation of materials. Carpenters in an Indian village. ... Look up Frame in Wiktionary, the free dictionary. ... A rafter is a structural member, a type of beam, which supports the roof of a building. ... Span is a section between two intermediate supports of a bridge. ... In mathematics, a rational number (commonly called a fraction) is a ratio or quotient of two integers, usually written as the vulgar fraction a/b, where b is not zero. ... The House of the Seven Gables, Salem, Massachusetts, showing four gables in this view. ...

Example: The pitch of a shed roof with an 8 foot (ft) rise (above wall height) by a 24 ft span (between exterior supporting walls) will be 1/3. The pitch of a gable roof with a 4 ft rise by a 24 ft total span will be 1/6. However, the slopes of each roof will be the same (1/3). A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ...

A simple (without hip or valley) shed roof is pitched with one exposure (sheet plane). A simple gable roof is pitched with two equal opposed-slope exposures. A simple salt box roof is pitched with opposed exposures of unequal split and, or, differing slopes (like two opposed shed roofs with differing pitches) sharing a common ridge. A combined pitched form has a vertical offset along a common ridge line. Hip and mansard (quad-pitched, very often mistakenly called double-pitched, hip) roofs are pitched with uniform slopes on all sides. Other roof styles include: flat (unpitched), domed, gambrel (quad-pitched, very often mistakenly called double-pitched, gable or barn), and A-frame, barrel-vaulted. The lower roof pitch is steeper than the upper roof pitch on quadruple-pitched roofs. A roof tiled in imitation of thatch at Croyde, north Devon, England Rooftops in Vietnam Snow on the roof temple roof Chang Mai, showing a decorated gable end, ceramic tile covering. ... Two intersecting planes in three-dimensional space In mathematics, a plane is a fundamental two-dimensional object. ...

In the United States slope is typically given in inches (in) per 1 ft or as a ratio of inches per 12 in; and commonly referred to with units of, less correctly and confusingly, "pitch" (e.g., for a slope of 1/3, "4 pitch(es)" is 4 in of rise over 1 ft of run and "4:12 pitch" is 4 in of rise over 12 in of run). In the UK, Austrailia and many other places, roof pitches given in degrees (°) are inclinations. An inch (plural: inches; symbol or abbreviation: in or, sometimes, ″ - a double prime) is the name of a unit of length in a number of different systems, including English units, Imperial units, and United States customary units. ... A ratio is a dimensionless, or unitless, quantity denoting an amount or magnitude of one quantity relative to another. ...

Notes

1. ^ Walker's Building Estimator's Reference Book