The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.
How to build a cut roof.
There are two basic methods of pitched roof construction.
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 ridge is a long board at the top that the rafters are nailed to.
The diagram above shows the components that go into making up a small gable roof.
And the line length measurement from the roof peak to the building wall is the hypotenuse.
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 ceiling joists span from wall plate to wall plate and are sometimes bolted to the rafters to help stop the ridge.
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.
The roof rafters provide integral structural support to the roof.
The rise or height of the roof at its peak is the altitude of the triangle.
The seat rests on top of the wall that you re attaching the particular rafter to while the shoulder cut parallels the wall and allows several inches of each rafter to overhang the roof.
Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter.
A birdsmouth cut has 2 parts.
Pitched roof construction.