What size should a hip rafter be?

What size should a hip rafter be?

They are also the same thickness as common rafters. However, they should be 2″ wider in their nominal dimension. For example, if you use 26 common rafters, use 28 hip rafters to provide full bearing for the end of intersecting jack rafters, as shown in Figure 18-2.

How do you work out the area of a hip roof?

Calculate the area of each face of the hip roof. For triangular faces, multiply the length of the base by the length from the ridge point to the bottom edge, then divide by 2. For parallelogram-shaped faces, first add the length of the ridge line to the length of the bottom edge.

How far can a 2×8 hip rafter span?

Max. Live Load 20 lbs/ft2 (956 N/m2)

Maximum Span (ft – in)
Nominal Size (inches) Rafter Spacing, Center to Center, OC (inches) Lumber Grade
2 x 8 12 18′ – 8”
16 16′ – 2”
24 13′ – 2”

How do you calculate hip to gable volume?

= Base area x 1/3 height….To work out the volume of your hip-to-gable extension, you will need to know:

  1. A – The depth of the main roof (i.e. the length from the front wall of the building to the back wall of the building)
  2. B – The height of the main roof.
  3. C – The distance from the ridge to the eaves in the plan.

Does a hip rafter need to be 45 degrees?

Hip rafters are fastened at a 45-degree angle to the ridge board down to the building’s four exterior corners. It is also used to nail the jack rafters’ tops. Jack rafters are attached to the hips and slope down to the outside walls. They have the same seat and tail shape as a regular automobile.

How to calculate your rafter length?

Go old school&use a scientific calculator and trigonometry (complicated unless you are a maths wiz)

  • When I pitch a small roof like a shed or dormer,I often just draw and set the rafter lengths out on a sheet of ply – no need for
  • For larger roofs though,I use a roofing ready reckoner.

    • How to calculate rafter thrust?

    Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. The calculation includes results for hip/valley factor, slope factor and the roof slope in degrees. If you add an eaves overhang dimension, then the calculator will add the amount the rafter sticks passed the wall to the rafter length.

    How to do rafter calculations?

    roof slope in degrees

  • slope factor
  • hip/valley factor
  • length of rafter in decimal feet
  • length of rafter in feet and inches

    • How to determine rafter length?

    rafter length = √ (rise² + run²). The formula used to calculate rafter length from roof pitch is, in fact, the same as the one above. The one difference is that we need to calculate the roof rise using the pitch first. So what you need to do first is to get the pitch, using the following formula: rise = run * pitch.