How To Measure Roof Pitch In Attic

Angle the angle of a roof is the same as the roof s slope except instead of being.

How to measure roof pitch in attic.

First measure 12 inches from one end of the level and make a mark. Up to 6 12 roof pitch use the standard formula as explained in this article. The easiest way to do this is by accessing a rafter in your attic if you can. You ll need to know what shape your roof is in order to make the calculations.

If you can t get to your attic you can measure slope on your rooftop as long as it s safe to go up there. 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. Two common types of roof are. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.

Measure the inches from the level s end up to the bottom edge of the rafter. Knowing that will determine what your roof s pitch since the run is 12 inches by default. It is often compared to slope but is not exactly the same. 7 12 to 10 12 roof pitches increase the amount of ventilation by 20 percent.

However an attic usually doesn t have straight walls. How roof pitch is calculated. In the attic put the level against a rafter with the 12 inch mark on the bottom. That measurement is the roof s rise.

To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. After measuring the slope estimate the roof pitch by dividing the slope by 2. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.

To accurately calculate the area of your roof you must first determine its slope or pitch. Here s a rule of thumb to follow. Before you calculate roof pitch you ll need to measure the slope of your roof. Generally as the roof pitch increases the volume inside the attic also increases along with the amount of needed attic ventilation.

From the attic hold a level perfectly level and touching a rafter at one end. 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 this is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Roof pitch calculator results explained. Another method to find the roof pitch is to go into the attic and measure the rise for a 12 run of the roof rafters which allows finding the pitch without going on the roof.

Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level.