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Understanding Hip Ridge Length in Building Design: Calculations and Framing Differences

This presentation explains the concept of hip ridge length in building design, detailing its calculation based on building dimensions. By subtracting the building width from its length, one can find the theoretical hip ridge length. However, actual ridge lengths are longer due to framing styles. The presentation discusses two common framing methods, how the presence or absence of common rafters affects the actual length, and provides essential calculations for accurate ridge length determination. Learn to ensure precision in your structural planning.

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Understanding Hip Ridge Length in Building Design: Calculations and Framing Differences

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Presentation Transcript

  1. Presentation 22: HIP RIDGE THEORY AND LENGTHENING

  2. Hip Ridge Length Hip Ridge Length = Building Length – Building Width Building Length Hip Hip Hip ridge length is found by subtracting. Building Width Ridgeboard Hip Hip Plan View

  3. Hip Ridge Length If a building is 28′ x 64′, the ridgeboard is … Building Length 64 – 28 = 36′ Hip Hip Building Width Ridgeboard Hip Hip Plan View

  4. 45° 45° Hip Ridge Length This works because hip run is at a 45° angle with common run. Therefore the common runs are equal.

  5. 45° 45° Hip Ridge Length Thus adding two of them will equal the Building Width.

  6. 45° 45° Hip Ridge Length Thus adding two of them will equal the Building Width.

  7. 45° 45° Hip Ridge Length Thus adding two of them will equal the Building Width. Length minus Width equals Ridge Length.

  8. Hip Common Common Ridge Common Hip Framing Methods There are two styles of framing hips at the ridge. Hip Common Common Hip

  9. Hip Common Common Ridge Common Hip Framing Methods One where a common rafter butts the ridge. Another with no common abutting the ridge. Hip Common Common Hip

  10. Theoretical Length Actual Ridge Length The subtraction that yields the ridge length is theoretical. Actual length is longer The amount of lengthening depends on framing style

  11. ¾″ Actual Ridge Length ¾″ longer when a common rafter butts the ridge. 1 13/16″ longer when no common rafter exists.

  12. 1 1/16″ ¾″ ¾″ Actual Ridge Length ¾″ longer when a common rafter butts the ridge. 1 13/16″ longer when no common rafter exists. A total of 1 13/16″

  13. Conclusions • Theoretical hip ridge length is found by subtracting building width from building length. • Ridge length is actually longer. • Add ¾″ when a common rafter butts the ridge. • Add 1 13/16″ when no common exists.

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