Run And Rise Roof

Pitch is the incline of the roof represented as the ratio of rise to the span twice the run.

Run and rise roof.

The rise is the distance from the top of the roof to the bottom. Rise and run for your porch roof your roof s slope also called pitch is determined by the rise and run. The horizontal change in distance or the horizontal distance covered by an un supported rafter or truss. That s the same as a 14 degree slope or a 25 slope.

Other than the 45 roof slope which is 12 in 12 none of the standard roof pitches 5 in 12 6 in 12 etc are equal to a whole degree. Using the example it would be six inches times 13 feet. Here is an online rise and run calculator which helps to calculate pitch slope and angle with the help of rise and run values. A 7 12 roof normally expressed as a ratio means that for every 12 inches horizontally the run your roof rises 7 inches.

The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. Multiply your figure for unit rise by your figure for total run to get the total rise. The run is the distance from the outside of the wall to the inside of the ridge. Why is the roof slope 25.

Since pitch is the rise over a 12 inch run divide the run by 12 to get the multiplier in this case 120 12 10. It can be assessed in two ways either as the angle the rafter makes with the horizontal or the proportion between the rise and the run of the roof. Calculate the roof rise using the figures for unit rise and total run. The total roof rise in the example equals 78 inches.

It just means the top of the roof has to end out at a specific place. Roof pitch is simply the slopecreated by the rafter. This is rarely is a whole number it is not a rare event and it is not a nightmare. For example if the roof rises 4 feet and the span is 16 feet twice the run then the pitch is 4 16 or 1 4.

On a 38 degree sloping roof angle t each individual vertical rise of 9 4 y 1 would have a horizontal run x 1 of 12 inches. 3 of rise per 12 of run is the same as 1 of rise per 4 of run or 1 4 25. A 3 in 12 roof rises 3 for every 12 of run. Total roof rise or change in elevation for a 38 degree sloping roof angle t with one giant rise or step of 7 8 feet to the center of the attic y 2 would have total a run x 2 of 10 feet.

The total run is the distance from the peak to the edge of the roof which in this case is the total width divided in half which is equal to 10 feet or 120 inches. The slope is the steepness of your roof and is the ratio between any two points on your roof.