Roof pitch and corresponding angles.
Gable roof pitch angle.
It is a traditional roof shape employed everywhere from tropical huts to nordic ski chalets.
Find out how to calculate roof pitch on an existing roof.
A frame roof is the sharpest gable style roof resembling the shape of the letter a.
The way pitch also known as roof slope is measured is rise over run.
To do this simply convert the rise and run as a fraction to a decimal form eg.
Rise run rise run slope.
A gable roof is a traditional triangle shaped roof that can range from a medium pitch to sharp angled roofs.
Use our calculator to convert the roof angle to pitch if using an angle finder.
First convert the pitch to a slope.
Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs.
A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible.
The table below describes different roof slopes giving roor slope in rise run in inches and re expressing the same slopes as angle grade walk ability and roof type or class.
The most commonly used roof pitches fall in a range between 4 12 and 9 12.
After they re up you can snap a line to mark and trim the tails in a nice straight line to make up for any ridge warp or marking cutting and fixing errors.
Pitches above 9 12 are very highly angled and are designated steep slope roofs.
This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.
Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled.
Roof pitch is the measurement of roof steepness.
On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length.
The gable roof pitch is the term used to describe the angle between the horizontal of the ceiling and wall line and the diagonal angle of the roof joists.
So if your roof rises 4 inches for every 12 inches of horizontal length then the pitch of your roof is expressed as 4 12.
Below you will be given short descriptions of how to calculate these two values.
Gable roof framing calculator plan diagram with full dimensions for a good straight fascia add an extra inch or 2 to the tails of all your rafters total length.
With the roof pitch the same it doesn t matter if the new addition is slightly off in height or lined up front to back because you re going over or under the old roof.
But it is important that the roof pitch is exactly the same as the existing roof because you will see it from one roof to the other if it isn t.
