To sum it up each individual tab on a 3 tab shingle measures approximately 12 wide by 6 high.
Measure roof pitch from ground.
For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.
One method to find the pitch is to climb on the roof and measure the rise for a 12 run.
Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.
Use a simple formula to approximate the square footage of triangular areas where two sections of a roof meet at each.
The pitch is the steepness of the roof.
If you do need to calculate the pitch an estimate or shortcut is usually more practical than measuring the roof s overall dimensions.
Use a pitch.
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.
Take the following steps to measure your roof from the ground.
For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally.
As aforementioned there is no standard pitch of a roof.
Calculate the pitch of the roof.
A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.
Divide the slope by two to get the pitch.
The first technique is referred to as the shingle count method which is used for estimating the measurements of all rectangular shaped sections of a roof.
Express roof pitch as the ratio of the amount of the vertical rise of a roof or rise over the corresponding horizontal distance or run you write the pitch assuming a run of 12 inches thus the ratio would describe how much a roof rises for each foot of the run.
To find the pitch of your roof you ll first.
Section off your roof and write your calculations down as shown below dotted lines.
Here are a couple examples.
Walk away from your house perpendicular to the wall that is under the roof pitch you d like to measure.
On the roof hold the level perfectly level and measure the height from the roof to the level 12 inches away from where the level touches the surface this will be the rise.
Walking backwards and watching where you re going walk out to the distance where your eye aligns with the plane on the roof pitch.
See the image below for more explanation on rise run and pitch.
Outside of the u s a degree angle is typically used.
Stretch your tape measure along the walls from end to end.
Make a outline of your roof on paper.
Research other methods for measuring a roof from the ground online or talk to a roofing contractor.
You ll need a level that is 12 or longer and a tape measure.
Determine your roof pitch see roofpitch if you need help.
Find the length and width of the building s exterior walls.