Roof Rafter Span Definition

So consider a simple gable roof on a 24 foot wide ranch framed with 2x6 exterior walls and a 1 1 2 ridge. Rafter spans for southern yellow pine douglas fir and eastern spruce. 1 in 25 4 mm.

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Rafter Designing Buildings Wiki

Rafters are the traditional means of framing a roof.

Roof rafter span definition.

In our sketch the rafter span is referred to as the rafter line length. Every piece is measured cut and fastened together to form the rafter. The span would be 11 5 3 4. The horizontal or level distance covered by the rafter the bottom chord or base of a right triangle.

Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. Normally a roof span is the same as the building width between the outer edges of the wall top plates. Definition of rafter span. This is the horizontal distance from the inside surface of the supporting wall to the inside surface of the ridge board.

Live load is weight of furniture wind snow and more. 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. This means that each rafter is built on the job site using dimensional lumber. Span calculator for wood joists and rafters also available for the android os.

The rafter in the corners of a hip roof. The un supported length of the rafter along its slope the diagonal or hypotenuse of a right triangle. This is the horizontal distance from the inside surface of the supporting wall to the inside surface of the ridge board. Definition of rafter run.

Definition of roof span. The foot of a hip rafter lands on a dragon beam. The upper rafters in a curb kerb gambrel mansard roof roof. 2 are indicated below.

The longest rafter on the side of a hip roof in line with the ridge. In our sketch above the rafter run is shown as run under the left half of the roof. Rather the span is based on the rafter s horizontal projection. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall.

Hip rafter angle rafter. Rather the span is based on the rafter s horizontal projection. 1 psf lb f ft 2 47 88 n m 2. 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.

Use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. 1 ft 0 3048 m. Building with them is known as stick framing. 1 the span of a rafter is not based on the measurement along its length.

Live load 20 lbs ft 2 956 n m 2. Dead load weight of structure and fixed loads 15 lbs ft 2. In our sketch above the rafter run is shown as run under the left half of the roof. Also available for the android os.