Roof Slope Factor Table

You can tie the ladder to the gutter or the fascia board.

Roof slope factor table.

For many home owners the roof is a hugely important feature of the home and is the key section of the home which is seen from the exterior. The roof pitch multiplier table is very helpful in giving correct and reliable roof measurements and uses pythagorean theory. Here are the steps to assist you so that you can do it all by yourself. See below after the table for directions on how to convert any roof slope from one form to another even roof slopes not shown in the table.

Take a ladder and reach to the top of the roof. Roof pitch is a term describing how steep or flat your roof slope is. A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof. This table lists all of the common roof slopes expressed as rise run roof angle roof slope slope grade and walk ability.

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. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. Given that roofs are normally spotted from a distance long before any windows and doors they will be a large determining factor as to what someone will think of when they look at your property.

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. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. It s just a little math. Divide the rise by the run the run is 12.

Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. To obtain an accurate roof pitch measurement properly measure the rise and run. Then you ll be able to measure slope from an unfinished attic space under the roof. For roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1.

The hip and valley factor varies according to the slope of the roof as shown in the table below. For any roof slope expressed as x in 12 rise in run the hip and valley factor is determined by finding the square root of rise run 2. Place the level at the center of the top ridge. The combination of two numbers are used to display or show the roof pitch.

Degrees to roof pitch rise in run to see a table.