How To Figure Out Roof Valley Angle

Divide the rise by the run the run is 12.

How to figure out roof valley angle.

If you use the wrong dimensions you will find the wrong angle. Then enter the value of the run and choose the unit of measurement from the drop down menu. This slope and skew calculator makes it easy by performing all of the necessary trigonometry for each hanger condition in the roof. Here are the steps to follow for the roof angle calculator.

First enter the value of the rise and choose the unit of measurement from the drop down menu. Convert measurements in feet and inches into decimal values before determining the roof angle. To calculate what r and a are note that rcos q a r cosq cosa r sinq sina r cosa cosq r sina sinq by the above identity. Degrees internal angle wall b to vertical α2.

Simply enter the roof pitches and press the calculate button the calculator will supply the direction and precise angles for the framing members as well as the connectors. 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. 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.

So we need to set rcosa a and rsina b to make this equal to acosq bsinq. Hopper valley angle calculation inputs internal angle wall a to vertical α1. Results internal valley angle to vertical α3 degrees external angle to horizontal α4 degrees. Rcosa a 1 rsina b 2 we can find a by dividing 2 by 1.

Includes result for hip valley factor slope factor and the roof slope in degrees. Check all your measurements twice. Degrees note type in respective value inside of coloured cell above then click outside cell to enter. Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement.

If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. So we have two equations.