Hip Roof Slope Factor

For example a shed has a 3 12 pitch roof with a outside wall dimension of 10 feet.

Hip roof slope factor.

Find the square root of the result. This way the pitch of the roof and the slope of the roof can be measured. There are lots of things to think about and consider when taking on a hip roof style so having a reliable all in one hip roof calculator is going to be very useful for this job. Once you ve figured out the pitch of your roof you can consult the following chart to discover the slope factor and hip valley factor.

Download the slope chart pdf. All formulae are below the calculator. One of users asked us to create calculator which will help him estimate hip roof parameters like rafter s lengths roof rise and roof area. Valley hip factor.

Reading the chart the factor for 3 12 is 1 4362. The higher the slope the steeper it is. The angle at which the roof plane rises will account for a consistent height in inches above the 12 inch horizontal line and is described as the nominator of the pitch calculation ratio. A hip or a valley is where two roof slopes intersect forming a peak or a depression.

Charts are helpful because the factors for hips and valleys are listed which is useful for cutting rafters on the hip or valley. A roof pitch of 4 in 12 4 12 has a rise of 4 and a run of 12. Length of the rafter. Valley hip factor.

Divide the rise by the run the run is 12. The hip and valley factor varies according to the slope of the roof as shown in the table below. The slope of the roof provides the rise and the run to be plugged into the equation. Multiply the roof length by the gable wall length 40 24 960 multiply this amount by the slope factor 960 1 1180 1073 28 the area of this roof 1073 3 sq.

The roof pitch factor is also used to calculate the length of common rafters. One expression of a hip roof pitch based on this formula would be 4 12 meaning a 4 inch vertical rise for every 12 horizontal inches. In that case the multiplier is multiplied by the run of the rafter the horizontal distance that will be covered by the rafter. This roof slope factor table also consists of hip and valley factors to measure the possible hips and valleys.

After that you will have to try and find a good hip roof pitch calculator to make sure you can get the last of the calculations. The length of the rafters can also be determined while determining the slope.