Use a pitch.
Measure roof pitch from ground.
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.
You ll need a level that is 12 or longer and a tape measure.
A 12 in 12 pitch is a steep 45 degree angle roof.
Find the length and width of the building s exterior walls.
Take the following steps to measure your roof from the ground.
Here are a couple examples.
Section off your roof and write your calculations down as shown below dotted lines.
As aforementioned there is no standard pitch of a roof.
One method to find the pitch is to climb on the roof and measure the rise for a 12 run.
Measuring your roof from the ground 1.
For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.
Use a simple formula to approximate the square footage of triangular areas where two sections of a roof meet at each.
Research other methods for measuring a roof from the ground online or talk to a roofing contractor.
Walking backwards and watching where you re going walk out to the distance where your eye aligns with the plane on the roof pitch.
Make a outline of your roof on paper.
Walk away from your house perpendicular to the wall that is under the roof pitch you d like to measure.
A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.
Stretch your tape measure along the walls from end to end.
Calculate the pitch of the roof.
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.
To find the pitch of your roof you ll first.
Determine your roof pitch see roofpitch if you need help.
The pitch is the steepness of the roof.
Divide the slope by two to get the pitch.
Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.
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.
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.
Go all the way around your house and fill in your outline with your measurements making sure to account for overhang.
If you do need to calculate the pitch an estimate or shortcut is usually more practical than measuring the roof s overall dimensions.
To sum it up each individual tab on a 3 tab shingle measures approximately 12 wide by 6 high.