Roof Pitch Multipliers by Slope (Roof Pitch Factors)
| Roof Slope (Rise-in-Run) | Roof Slope (In Degrees) | Roof Pitch Multiplier |
| 0.5-in-12 | 2.39° | 1.001 |
| 1/12 | 4.76° | 1.003 |
| 1.5/12 | 7.13° | 1.008 |
| 2/12 | 9.46° | 1.014 |
How do you calculate the slope of a roof?
13 rows · Roof Pitch is a term used in the roofing industry to describe the angle (slope) of a roofing ...
How to determine slope of roof?
3 rows · The roof slope factor is written as "x/12," where "x" is the vertical distance you measured from ...
Why is determining roof slope important?
· What Is The Roof Slope Factor? The roof slope factor is written as “x/12 ,” where “x” is the vertical distance you measured from roof to level. For instance, if the measurement was 3, your roof slope factor would be 3/12, and you would have a roof with a low slope.
What is the formula for computing a roof slope?
61 rows · Once you know your roof slope expressed as “X-in-12″ (rise-in-run), the roof pitch ...
How do you find the slope factor of a roof?
The roof slope factor is written as "x/12," where "x" is the vertical distance you measured from roof to level. For instance, if the measurement was 3, your roof slope factor would be 3/12, and you would have a roof with a low slope.
What is the slope for a roof?
The slope of a roof, often referred to as the pitch, is determined by “rise over run” - the roof's vertical rise in inches for every twelve inches of horizontal length (the run). So a roof with four inches of rise every 12 inches horizontally (run) would have a slope of 4/12 (sometimes displayed as 4:12).
What is a roof factor?
A roof pitch factor, also called a roof pitch multiplier, is a number that you use to find the actual surface area of a pitched roof or the length of a common rafter. You multiply the roof pitch factor by the area, or footprint, covered by a sloped roof to find the actual surface area of the roof.
What is the slope factor for an 8 12 roof?
The pitch is defined as the slope of the roof, and is commonly represented as the ratio of the RISE over the RUN in the form x/12....What is the roof pitch factor?Roof PitchAngleRoof Pitch Factor8/1233.69°1.20199/1236.37°1.250010/1239.81°1.301711/1242.51°1.35668 more rows
What is the standard slope?
Standard form is another way to write slope-intercept form (as opposed to y=mx+b). It is written as Ax+By=C where A, B, C are all integers. You can also change slope-intercept form to standard form like this: Y=-3/2x+3.
How do you determine the slope?
Using the Slope EquationPick two points on the line and determine their coordinates.Determine the difference in y-coordinates of these two points (rise).Determine the difference in x-coordinates for these two points (run).Divide the difference in y-coordinates by the difference in x-coordinates (rise/run or slope).
What is a 3/12 slope roof?
It is the most common way in US and Canada to describe a roof's basic quality – slope or steepness. Roof pitch is represented in inches rise of 12 inches run. For example a “3 pitch” or “3 in 12 pitch” or “3/12 pitch”, all mean that the roof rises 3 inches, for every 12 inches of it's horizontal run.
What is a pitch factor?
Definition of pitch factor : the ratio of the voltage induced in a short-pitch winding to the voltage that would be induced if the winding were full pitch.
What is the best roof pitch for snow?
Roofs in snowy climates should have a slope of at least a 10-degree pitch minimum. A steeper angled roof sheds the snow more quickly. While the angle of the roof helps shed snow, adding too many angles to the roof for a more aesthetic effect could cause structural problems with snow shedding in the wintertime.
What roof pitch is 8 degrees?
1.687 inTable 2: Slopes in Degrees Converted to Standard Roof PitchConvert Roof Slope from Degrees to Rise in Run5°1.050 in 126°1.261 in 127°1.473 in 128°1.687 in 1221 more rows
How much pitch do I need for a lean to roof?
To guarantee water drainage, a roof should have a slope of at least 1/8 inch per foot of horizontal run, but that's a bare minimum. A slope of 1/4 inch per foot is better and specified by some building codes.
What is roof pitch conversion factor?
The roof pitch conversion factor is a number that, when multiplied by the area covered by the roof, gives an estimate the total surface area of the sloped roof itself. It is sometimes called the roof pitch multiplier.
What does greater slope mean?
In other words, the surface area is impacted by the slope of the roof. A greater slope means a greater correction factor in the form of the roof slope multiplier.
How to measure the area of a roof?
Measure the dimensions covered by the roof. For this example, suppose the roof is 20 ft wide (measured from the roof ridge to the edge of the building) by 40 ft long . This means: $$Area,covered,by,roof = 20 × 40 = 800,square,feet$$
Where does the roof pitch multiplier come from?
The formula for the roof pitch multiplier comes from the formula for a right triangle, and more specifically the Pythagorean Theorem:
What is roof pitch?
The roof pitch is a measure of roof steepness. The pitch is defined as the slope of the roof, and is commonly represented as the ratio of the RISE over the RUN in the form x/12.
How many inches is a rafter?
We can use the Pythagorean Theorem to find the RAFTER length corresponding to a horizontal span of 12 inches and a rise of 3 inches:
What is a low slope roof?
1. Low slope roofs are from 0 to 3 / 12 in pitch. Some sources consider low slope to include 3 / 12 pitch roofs. If asphalt shingles are to be installed on a low slope roof, special steps are required to avoid short roof life and roof leaks.
What is the lowest possible slope for a typical or even a special high-seam metal roof?
Watch out: I went to 4:12 because I don't know of any metal roof that will drain successfully without leakage at the 1-2" overall slope over 14 ft. or more in your example. The lowest possible slope for a typical or even a special high-seam metal roof would be 3:12.
When was the book Slate Roofs published?
Slate Roofs, National Slate Association, 1926, reprinted 1977 by Vermont Structural Slate Co., Inc., Fair Haven, VT 05743, 802-265-4933/34. (We recommend this book if you can find it. It has gone in and out of print on occasion.)
How do I level an 18 ft rafter?
Mark on the roof the contact point that your 18 ft rafter makes on the roof when it's set to the proper slope (4:12) - or if you don't have an angle measurer or level, build the green and blue frame I show for one of your straightest rafters and hold it in place with the top cord (that 203.7" member) set to level.
Where is the A frame roof located?
The A-frame style roof shown just above, located on Highway 61 just South of Hovland Minnesota, is built at a 75° angle and is considered a very-steep roof.
Is a 4 in 12 roof a steep slope?
What we're showing for a 4 in 12 slope roof is that it is considered an "easy to walk on" slope but also that. roofs of 4/12 and steeper are also considered "steep slope" roofs while. slopes below (flatter) than 4/12 are considered "low slope" roofs.