Thursday, April 18, 2013

Hip Rafter Side Cut Layout

Hip Rafter Side Cut Layout:

3D model by SBE Builders



This model shows you how to layout the hip rafter side cut angles using traditional geometry layout. The model has 3 folded edges of the hip rafter showing the hip rafter side cut angles on the top...

This unequal pitched roof model shows you how to layout the hip rafter side cut angles using traditional geometry layout. The model has 3 folded edges of the hip rafter showing the hip rafter side cut angles on the top edge of the hip rafter. These side cut angles are developed from the hip rafter offset and hip rafter backing depth.

If you don't know the hip rafter backing depth and hip rafter offset, you'll never be able to layout an unequal pitched roof hip rafter correctly. See my blog on hip rafter offset for the geometry of the hip rafter offset. The hip rafter backing depth, on the side of the hip rafter, for unequal pitched roofs can be developed using geometry or it can be calculated with using my Rafter Tools app or Rafter Bevel Angles app.

for equal pitched roofs you can use
backing depth  = ( width of hip rafter * 0.5) * tan( hip rafter backing angle)

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