How To Figure A Valley On 5 12 Pitch Roof

The first step in a free roofing estimate is measuring the roof dimensions.

How to figure a valley on 5 12 pitch roof.

You write the pitch assuming a run of 12 inches thus the ratio would describe how much a roof rises for each foot of the run. Keep in mind that the average size of a roof is 1 700 square feet so your total will likely be 10 higher or lower than this figure. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Divide the rise by the run the run is 12.

Most of the times it is the same as the pitch the jack rafter is on. If this distance measures 4 inches you have a 4 in 12 pitch. As aforementioned there is no standard pitch of a roof. Pitch measurement method 1.

But the most commonly used pitches range between 4 12 and 9 12. Includes result for hip valley factor slope factor and the roof slope in degrees. 8 inches and you have an 8 in 12 pitch. Find the square root of the result.

You will need to express this size in terms of square feet. Angle the angle of a roof is the same as the roof s slope except instead of being. The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7. If it is not the same it does not matter to this calculator.

Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. This is the adjacent roof that will share the hip or valley. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. 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.

On a ladder beside the roof place the level a foot or so up the roof hold it level and measure from the 12 inch mark on the level s bottom straight down to the roof. Slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run this is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. Use one of these three methods below to calculate your roof s pitch.

Roof pitch calculator results explained. You ll need a level and a tape measure or ruler. To calculate a valley roof select valley from the roof type dropdown list or click on the the corresponding button on the toolbar to calculate a valley roof. It is also necessary to select the pitch of the complimentary roof.

Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used. The hip and valley factor varies according to the slope of the roof as shown in the table below. Next select a the pitch the jack rafter is on. When referring to roofs the term pitch means two.

The preview window displays a plan view of the valley roof.