The square root of 180 is 13 416.
Roof slope factor table.
Warm roof slope factor cold roof slope factor.
On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length.
Here are the steps to assist you so that you can do it all by yourself.
This table shows the roof pitch multiplier also called the roof pitch factor for typical roof slopes used to find the area of sloped roofs or the lengths of common rafters.
Suppose you have a 6 12 pitch roof.
The following table shows how the same common roof slopes can be expressed using rise in run ratios degrees and percentages.
The roof slope factor can be determined through sections 7 4 1 through 7 4 4 of asce 7 10 and can be known as.
Accurate roof calculations are achieved using this table and all you need to do is measure the roof width and length and then you are ready to do a roof pitchmeasurement.
For example if you measure 4 inches the pitch of your roof is 4 12.
This will give you the rise over run or pitch.
Six squared is 36 and 12 squared is 144.
Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.
This article series gives clear examples just about every possible way to figure out any or all roof dimensions and measurements expressing the roof area width length slope rise run and unit rise in inches per foot.
Roof slope pitch rise run typw walkability table.
The result is divided by 12.
See below after the table for directions on how to convert any roof slope from one form to another.
This table lists all of the common roof slopes expressed as rise run roof angle roof slope slope grade and walk ability.
The roof slope factor is dependent on various roof properties including temperature shape and material.
Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials.
Adding 36 plus 144 equals 180.
Place the level at the center of the top ridge.
Therefore your slope factor for a 6 12 pitch roof is 1 118.
The roof pitch multiplier table is very helpful in giving correct and reliable roof measurements and uses pythagorean theory.
Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter.
From here note down the reading of the level to the.
Dividing 13 416 by 12 equals 1 118.
