Hip Roof Slope Factor

A roof pitch of 4 in 12 4 12 has a rise of 4 and a run of 12.

Hip roof slope factor.

The slope of the roof provides the rise and the run to be plugged into the equation. 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. 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. The roof pitch factor is also used to calculate the length of common rafters.

Download the slope chart pdf. Length of the rafter. 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. 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.

To get results you need to provide roof base dimensions length and width and roof pitch we assume it is identical for all sides. Charts are helpful because the factors for hips and valleys are listed which is useful for cutting rafters on the hip or valley. Valley hip factor. Find the square root of the result.

Reading the chart the factor for 3 12 is 1 4362. Valley hip factor. In that case the multiplier is multiplied by the run of the rafter the horizontal distance that will be covered by the rafter. The length of the rafters can also be determined while determining the slope.

The higher the slope the steeper it is. The hip and valley factor varies according to the slope of the roof as shown in the table below. This roof slope factor table also consists of hip and valley factors to measure the possible hips and valleys. 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.

For example a shed has a 3 12 pitch roof with a outside wall dimension of 10 feet. Feet the area of a hip roof equals the area of a gable roof with the same dimensions. 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. All formulae are below the calculator.

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. This way the pitch of the roof and the slope of the roof can be measured.