Roof Slope Factor Table

The roof pitch multiplier table is very helpful in giving correct and reliable roof measurements and uses pythagorean theory.

Roof slope factor table.

The result is divided by 12. 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. Place the level at the center of the top ridge. 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.

Dividing 13 416 by 12 equals 1 118. This table lists all of the common roof slopes expressed as rise run roof angle roof slope slope grade and walk ability. 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 roof slope factor is dependent on various roof properties including temperature shape and material.

This will give you the rise over run or pitch. See below after the table for directions on how to convert any roof slope from one form to another. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio.

Therefore your slope factor for a 6 12 pitch roof is 1 118. Six squared is 36 and 12 squared is 144. From here note down the reading of the level to the. The square root of 180 is 13 416.

Roof slope pitch rise run typw walkability table. 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. 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. Here are the steps to assist you so that you can do it all by yourself.

The following table shows how the same common roof slopes can be expressed using rise in run ratios degrees and percentages. Take a ladder and reach to the top of the roof. 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. You can tie the ladder to the gutter or the fascia board.

Warm roof slope factor cold roof slope factor. Adding 36 plus 144 equals 180.