So consider a simple gable roof on a 24 foot wide ranch framed with 2x6 exterior walls and a 1 1 2 ridge.
Roof rafter span definition.
2 are indicated below.
This is the horizontal distance from the inside surface of the supporting wall to the inside surface of the ridge board.
Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.
Rafters are the traditional means of framing a roof.
In our sketch above the rafter run is shown as run under the left half of the roof.
Definition of rafter span.
In our sketch above the rafter run is shown as run under the left half of the roof.
Building with them is known as stick framing.
Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall.
Definition of roof span.
The longest rafter on the side of a hip roof in line with the ridge.
1 in 25 4 mm.
Dead load weight of structure and fixed loads 15 lbs ft 2.
The horizontal or level distance covered by the rafter the bottom chord or base of a right triangle.
This means that each rafter is built on the job site using dimensional lumber.
The span would be 11 5 3 4.
Live load is weight of furniture wind snow and more.
1 ft 0 3048 m.
Every piece is measured cut and fastened together to form the rafter.
1 the span of a rafter is not based on the measurement along its length.
Normally a roof span is the same as the building width between the outer edges of the wall top plates.
The upper rafters in a curb kerb gambrel mansard roof roof.
Rather the span is based on the rafter s horizontal projection.
Hip rafter angle rafter.
Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.
Rather the span is based on the rafter s horizontal projection.
The rafter in the corners of a hip roof.
The foot of a hip rafter lands on a dragon beam.
The un supported length of the rafter along its slope the diagonal or hypotenuse of a right triangle.
Use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.
Also available for the android os.
In our sketch the rafter span is referred to as the rafter line length.
Rafter spans for southern yellow pine douglas fir and eastern spruce.
Live load 20 lbs ft 2 956 n m 2.
1 psf lb f ft 2 47 88 n m 2.
Definition of rafter run.
