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HOW TO DETERMINE YOUR ROOF
PITCH
Why is it important to know the roof pitch?
Determining the roof pitch is very important when giving roof
estimates, it directly affects all parts of the estimate. The
steeper the pitch the more the costs goes up. For instance: Roof Tear-Offs, Loading the Roof and Applying the
Roof, the cost will increase as the roof pitch gets steeper.
Correctly determining the roof pitch, prior to figuring the roof
estimate is critical in figuring a precise and accurate roof
estimate.
Note: Many roofs have more than 1 pitch so you must determine the
amount of squares per the different roof pitches.
How to determine the Roof Pitch.
You need to determine how many inches the roof rises for every 12"
it runs or spans.
Simply place a level across the top ridge with the 12" mark resting
directly on the center top of the ridge, and make sure the level is
level. Now take a measurement from the surface of the roof to the
bottom of the level, how ever many inches that reads is the roof
pitch. For instance: If your tape measure reads 6" then the roof
pitch is a 6/12, if your tape measure reads 8" then the roof pitch
is a 8/12 etc. If there are existing roof layers you will need to
allow for these, try and determine how thick those layers of
roof protrude above the roof sheathing and add this amount to the
tape measurement reading. For instance: If the roof layers protrude
above the roof 1", simply add 1", so if your tape measurement read
6" you would add 1" which equals 7" or 7/12.
You can also determine the roof pitch from a ladder with out having
to get on the roof. From the bottom of a rafter tail or at a barge
rafter at the gable end on the over hangs of the roof, the procedure
will be the same. This way is more accurate because there are no
layers of roofing to compensate for.
The pitch factor will get multiplied by the total amount of squares,
each roof pitch has its own pitch factor as shown in the chart
below. Hips, Rakes and Valleys also use the same pitch factor.
We've added a New Pitch Factor form, for measuring from
Blue Prints!!
Simply enter in your
measurements or enter in the whole amount roof squares at one time.
Choose the roof pitch and Roof Estimator will
automatically multiply the amount squares by the roof pitch factor,
to give you the correct amount squares. When
measuring from blue prints you need to take into consideration the
roof pitch, since blue prints have no rise/pitch, you're blue prints
will have the correct roof pitch noted on them. Same goes for Hips,
Rakes, and Valleys. We've also included a % waste box that will
allow for any waste for cut-up roofs with lots of hips and valleys.
View the Pitch Factor screen shot below
Pitch Factor Chart
| Roof Pitch |
Pitch Factor (Gets Multiplied by Total Sqs.) |
| 2/12 |
1.01 |
| 3/12 |
1.03 |
| 4/12 |
1.05 |
| 5/12 |
1.08 |
| 6/12 |
1.12 |
| 7/12 |
1.16 |
| 8/12 |
1.20 |
| 9/12 |
1.25 |
| 10/12 |
1.30 |
| 12/12 |
1.41 |
| 14/12 |
1.54 |
| 16/12 |
1.67 |
| 18/12 |
1.80 |
| 20/12 |
1.94 |
| 22/12 |
2.09 |
| 24/12 |
2.24 |
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Call Toll Free!
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1-888-524-3464 |
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1-888-5-BIDING |
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