The rise or height of the roof at its peak is the altitude of the triangle.
How to build a cut roof.
A horizontal cut called the seat cut and a vertical cut called a shoulder cut.
Robin is working on an extension so we thought we d shadow him for the day and see how he creates a pitched roof or semi pitched roof leading up to a flat.
The ridge is a long board at the top that the rafters are nailed to.
The roof rafters provide integral structural support to the roof.
Pitched roof construction.
There are two basic methods of pitched roof construction.
A cut roof this is the traditional method of cutting the timber on site and building up the roof using rafters ridge boards joists and purlins etc the exact details being determined by the size of roof size of timbers etc.
And the line length measurement from the roof peak to the building wall is the hypotenuse.
If you re framing a gable roof on a new house or building a shed or even a doghouse with a gable roof you ll need to cut a number of roof rafters.
The ceiling joists span from wall plate to wall plate and are sometimes bolted to the rafters to help stop the ridge.
The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.
The diagram above shows the components that go into making up a small gable roof.
The run or half the building span is the base of the triangle.
A birdsmouth cut has 2 parts.