In order to build any but a shed type roof including trusses you ll need to first determine a few factors.
Gable and valley roof construction.
Wide especially when the eave overhang is less than 12 in.
Where two gable roof lines meet the intersection forms inside corners called valleys.
Put roof sheathing on top of your roof.
Use 1 2 in 1 3 cm plywood to cover the entire surface of your roof.
Hip and gable roof components plan view of the hip and gable roof that you are going to build.
Valleys are typically found where gable dormer roofs meet the main roof or when a house has angled wings or additions where two roof sections in different planes meet.
The gable is the most common and it can be complicated with multiple roof lines including valleys and dormers.
Thick and the overhang from the side wall set between 12 in.
Hip and gable roof components.
To 18 in depending on the style of the building.
The diagonal rafter that runs from the intersection of the ridges down to the top of the walls at the inside.
The span rise run and line length.
Place a piece of the plywood on the bottom corner of your roof making sure the edges are on a rafter beam.
When designing a gable end eave without a return the dimensions to look at are the width of the trim set between 6 in.
Shed gable hip gambrel and mansard.
Again don t be tempted just to look the names put in a bit more effort to try to remember all the names of the individual components.
Avoid gable ends that are over 8 in.