How Much Overhang On Roof Rafters

Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood.

How much overhang on roof rafters.

Roof overhangs are the amount that the roof hangs over the top of the siding in residential home construction. With a 3ft overhang that corner is going to be pretty soft. An overhang is the portion of the roof that runs past the wall providing coverage for the space around the foundation of your shed. On sheds and homes overhangs are commonly referred to as eaves or rakes depending on where they are located.

Click the button to calculate the stock size needed for this job. Birdsmouth plumb if you study the diagram carefully you will see that there is an indentation in the roof rafter where it meets the exterior wall of the building. Input the rafter span on the flat eave overhang and pitch of the roof. Here the overhang is 320 13 inches.

Gable trusses are only dropped over the area of the building not the overhang. A typical metal roof overhang may be 2 to 4 inches or even less. So the corner is supported by one 2 x4 located usually 2 to 4 ft in from the exterior wall and the rough fascias making for a weak spot you feel when you walk the roof. Input the rafter span on the flat eave overhang and pitch of the roof.

The siding underneath the overhang is known as the soffit. Click the button to calculate the stock size needed for this job. For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2. Rafter stock size calculator.

The typical maximum overhang is 2 feet. Overhang the overhang should be measured from the outer edge of the exterior wall to the furthest point of the rafter. This calculator is to be used as an estimating tool only.