Determine your roof pitch see roofpitch if you need help.
How to measure roof shingles from ground.
Multiply the angle measurement for the pitch of.
Measure the horizontal run of the roof surface from the ground a in the third figure below.
Take the following steps to measure your roof from the ground.
Measure the pitch of your roof in the attic.
If the existing shingles are standard 3 tab shingles you can get this measurement by taking note of the number of tabs along the eaves and ridges then determine the length in feet.
Remember that the length and width need to be found for the roof not the house so take into account that the roof overhangs the building.
Start by measuring the length and width of the roof in feet as you re standing on the ground.
You will then have to get the measurement of the rake of the roof.
Go all the way around your house and fill in your outline with your measurements making sure to account for overhang.
Then determine the area of the roof as if it were flat.
Thus in a simple style house you ll only have to click on the corners.
Then count the number of shingles to the peak of the roof.
Multiple the number of shingles times the width of each shingle which you can measure at ground level to get b in the figure below.
If you were to click on the peaks it wouldn t give you an accurate reading of your measurement.
To do this you need to note that one tab will be equal to 1 foot.
Make a outline of your roof on paper.
Hold the end you measured from against the bottom of a rafter so it s sticking straight out horizontally and is level.
From the 1 ft 0 30 m spot you marked on the level measure upward to the rafter.
Mark a length of 1 foot 0 30 m on a long level starting from one end.
To sum it up each individual tab on a 3 tab shingle measures approximately 12 wide by 6 high.