Roof Slope Factor Table

Six squared is 36 and 12 squared is 144.

Roof slope factor table.

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. You can tie the ladder to the gutter or the fascia board. 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. The result is divided by 12.

From here note down the reading of the level to the. Warm roof slope factor cold roof slope factor. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. For example if you measure 4 inches the pitch of your roof is 4 12.

Therefore your slope factor for a 6 12 pitch roof is 1 118. 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. 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. Here are the steps to assist you so that you can do it all by yourself.

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. 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. Adding 36 plus 144 equals 180. Dividing 13 416 by 12 equals 1 118.

Take a ladder and reach to the top of the roof. The square root of 180 is 13 416. The following table shows how the same common roof slopes can be expressed using rise in run ratios degrees and percentages. 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.

This table lists all of the common roof slopes expressed as rise run roof angle roof slope slope grade and walk ability. Suppose you have a 6 12 pitch roof. Place the level at the center of the top ridge. See below after the table for directions on how to convert any roof slope from one form to another.

The roof pitch multiplier table is very helpful in giving correct and reliable roof measurements and uses pythagorean theory. The roof slope factor is dependent on various roof properties including temperature shape and material.