How To Figure An Existing Roof Slope

This forms an angle of 18 5 between the horizontal section and the roof and creates a gentle incline that is seen as a midpoint between a low pitch and medium pitch roof.

How to figure an existing roof slope.

Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level. Now you have to click the calculate button of the. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Now select the unit of measurement from the drop down.

It is often compared to slope but is not exactly the same. Roof pitch refers to the amount of rise a roof has compared to the horizontal measurement of the roof called the run. The most precise way to find the roof s slope is by measuring it from the underside. To find the angle of a roof in degrees convert the pitch to a slope then convert to degrees by finding the arc tangent of the slope.

First convert the pitch to a slope. Right after you have to add the value of run in the given space. 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. First measure 12 inches from one end of the level and make a mark.

Working from the interior side of the roof you ll need access to a roof rafter to measure the pitch. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil.

If you need to find the pitch of an existing roof all you need is a level and a tape measure. To see how pitch impacts the look of a garage and changes cost click the design center button on our pole barn kits page. For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally. Rise run rise run slope.

Place the level horizontally along the rafter until it contacts the roof sheathing avoiding any protruding roof nails. Use a level against the underside of the rafter you re measuring to get the most accurate value. First of all you have to enter the value of the rise in the given place. For a roof with the ridge above one wall the span is the same as the run.

To do this simply convert the rise and run as a fraction to a decimal form eg. Locate the level s 12 inch mark. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. Now select the unit of measurement from the.

Here s an easy safe way to determine the pitch from inside your attic. The slope is the same as the pitch.