How To Check A Roof Pitch

Often you express roof pitch as the ratio between the rise and the run in the form of x 12.

How to check a roof pitch. Measure the rise of your roof. For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally. Pitch rise run 1 5 6 25. Roof pitch refers to the slope which the rafter creates.

First measure 12 inches from one end of the level and make a mark. Make sure your have a 12 mark on your level. Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level. Climb on the roof and measure.

The underside of a rafter on a overhang at the bottom of the roof 3. The underside of a rafter in the attic. How to measure roof pitch to measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil. For a roof with the ridge above one wall the span is the same as the run.

Calculate the rafter length substituting these values into the following formula. 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. For more complex roofs you may need to calculate it section by. The slope is the same as the pitch.

Rise run rise run slope. To do this simply convert the rise and run as a fraction to a decimal form eg. How to determine your roof pitch the easy way step 1. Working from the interior side of the roof you ll need access to a roof rafter to measure the pitch.

Some levels have markings already and in this case you are ready. Let s say it is equal to 1 5 m. Calculate the roof pitch as the proportion of rise and run. First convert the pitch to a slope.

You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof. Place the level horizontally along the rafter until it contacts the roof sheathing avoiding any protruding roof nails. The underside of a barge rafter on a gable end.