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104:, "pitch" is usually expressed with the rise first and run second (in the US, run is held to number 12; e.g., 3:12, 4:12, 5:12). In metric systems either the angle in degrees or rise per unit of run, expressed as a '1 in _' slope (where a '1 in 1' equals 45°) is used. Where convenient, a
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The primary purpose of pitching a roof is to redirect wind and precipitation, whether in the form of rain or snow. Thus, pitch is typically greater in areas of high rain or snowfall, lower in areas of high wind. The steep roof of the tropical
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Knight's
American mechanical dictionary: being a description of tools, instruments, machines, processes, and engineering; history of inventions; general technological vocabulary; and digest of mechanical appliances in science and the
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expressed as a ratio of inch(es) rise per horizontal foot (or their metric equivalent), or as the angle in degrees its surface deviates from the horizontal. A flat roof has a pitch of zero in either instance; all other roofs are
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US convention is to use whole numbers when even (e.g. "three in twelve") or the nearest single or two-digit fraction when not (e.g. either "five and a half in twelve" or "five point five in twelve", each expressed numerically as
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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, and local building codes.
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Historically, roof pitch was designated in two other ways: A ratio of the ridge height to the width of the building (span) and as a ratio of the rafter length to the width of the building.
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A roof that rises 3 inches per foot, for example, would be described as having a pitch of 3 (or “3 in 12”).
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In trigonometric expression, exact roof slope in degrees is given by the arctangent. For example: arctan(
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Working on roofs with pitches too steep for safety requires a staging of scaffolding boards secured with
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allow for lower structures with a corresponding reduction in framing and sheathing materials.
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Some types of stone roof have a very restrictive roof pitch, which can lead to leaking
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roofs (up to 4:12 (1 in 3)) require special materials and techniques to avoid leaks.
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A dictionary of architecture and building: biographical, historical, and descriptive
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roofs of
Northern Europe are typical in regions of heavy snowfall. In some areas
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The pitch of a roof is its vertical 'rise' over its horizontal 'run’ (i.e. its
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35:, one of the oldest roofing materials, needs a steep pitch to drain properly
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158:, Quebec, Canada, specify 6 in 12, a pitch of approximately 26.6 degrees.
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is above 9:12 (3 in 4) (21:12) (7 in 4) and may require extra fasteners.
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Elizabethan: the rafters are longer than the span (more than 60°).
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Second
Edition on CD-ROM (v. 4.0) © Oxford University Press 2009
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A pitch gauge measuring the slope of an asphalt shingle roof
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Definitions vary on when a roof is considered pitched. In
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473:.. vol. 2. New York: J.B. Ford and Co., 1874. 1719. Print.
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is used (e.g., a '3 in 4' slope, for a '9 in 12' or '1 in
405:. New York: The Macmillan Co. ;, 1901. 152. Print.
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describes pitches from 4:12 (1 in 3) to 9:12 (3 in 4).
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Concise encyclopedia of construction terms and phrases
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Commonly used roof pitches were given names such as:
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416:Miter angles and miter saws, thisiscarpentry.com
330:Gothic: the rafters equal the span (60°); and
23:Display of roof pitches 1:12 through 18:12
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468:"Pitch" def. 2. Knight, Edward Henry.
240:on an angle to "pitch" a roof. Lower
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291:the span (an angle of 12.5° to 16°);
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434:. New York: Momentum, 2014. Print.
314:the span (an angle of 24° to 34°);
248:Historic expressions of roof pitch
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430:"Slope" def. 1. Schmid, Karl F..
167:roof includes pitches as low as
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207::12 and 5.5:12) respectively.
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317:Common: the rafter length is
497:Online roof pitch calculator
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102:imperial measurement systems
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487:How to determine roof pitch
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294:Roman: the ridge height is
271:Greek: the ridge height is
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401:"Pitch" Sturgis, Russell.
150:require a minimum slope.
454:Oxford English Dictionary
16:Measure of roof steepness
379:"Roof Slope Multiplier"
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93:), also known as its '
69:is the steepness of a
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492:Roof pitch calculator
359:Types of Pitched roof
327:the span (about 48°);
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517:Building engineering
452:"Pitch" def. 24.c.
344:List of roof shapes
242:pitched roof styles
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383:Roof Online
227:) = 14.0°.
85:Description
506:Categories
388:2018-05-19
365:References
234:carpenters
67:Roof pitch
354:Flat roof
349:Shed roof
179:low-slope
140:longhouse
126:Selection
512:Building
338:See also
156:Montreal
322:⁄
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238:rafters
231:Framing
222:⁄
212:degrees
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100:In the
76:pitched
144:gabled
33:thatch
187:Steep
95:slope
471:arts
236:cut
164:flat
154:and
122:').
91:span
71:roof
304:to
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
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