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All
About It How It Works Specifications
How To Install
Getting
Started
Determining Roof
Pitch Pricing Ordering
Installing Tubular Skylights
Determining Roof Pitch
DETERMINING ROOF PITCH
There are two different ways to determine your roof slope.
Method One
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Take a carpenter’s level and place it against your
roof as show in the illustration below. Be
sure it is level.
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From the point where the level touches the roof, measure
out 12 inches.
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From this point, measure the distance in inches from the
bottom of the level to the roof.
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This will be the first number in the roof pitch. The second number is always 12.
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Use the chart below
(See Amount of Drop) to determine the amount you will need to drop
the mark for the roof hole down the slope of your roof as indicated below.
Your “ROOF PITCH” is simply how far the roof drops vertically
for every 12” of horizontal run.
Method Two
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Use our roof slope chart (See Slope Chart) and
visually determine the pitch of your roof.
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Corresponding to that pitch is a drop length.
Drop the mark for the roof hole directly down the
slope as indicated (See Roof Pitch Chart).
ROOF PITCH
Pitch
Amount of
Drop
2:12
1”
3:12
1 ½”
4:12
2”
5:12
2 ½”
6:12
3”
7:12
3 ½”
8:12
4”
9:12
4 ½”
10:12
5”
11:12
5
½”
12:12
6”
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