Roof Slope Factor Table

Divide the rise by the run the run is 12.

Roof slope factor table.

Roof pitch is a term describing how steep or flat your roof slope is. 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. You can tie the ladder to the gutter or the fascia board. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

Then you ll be able to measure slope from an unfinished attic space under the roof. It s just a little math. This table lists all of the common roof slopes expressed as rise run roof angle roof slope slope grade and walk ability. The roof pitch multiplier table is very helpful in giving correct and reliable roof measurements and uses pythagorean theory.

Take a ladder and reach to the top of the roof. 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. Degrees to roof pitch rise in run to see a table.

Also see our page quick reference. 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. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. From here note down the reading of the level to the.

Place the level at the center of the top ridge. To obtain an accurate roof pitch measurement properly measure the rise and run. The combination of two numbers are used to display or show the roof pitch. 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.

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 hip and valley factor varies according to the slope of the roof as shown in the table below. 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. Here are the steps to assist you so that you can do it all by yourself.

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.