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Presentation 22:

HIP RIDGE THEORY AND LENGTHENING

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Hip Ridge Length

Plan View

Building Length

Bui

ldin

g W

idth

Ridgeboard

Hip

HipHip

HipHip ridge length is

found by subtracting.

Hip Ridge Length = Building Length – Building Width

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Hip Ridge Length

Plan View

Building Length

Bui

ldin

g W

idth

Ridgeboard

Hip

HipHip

Hip

If a building is 28′ x 64′, the ridgeboard is …

64 – 28 = 36′

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Therefore the common runs are equal.

Hip Ridge Length

This works because hip run is at a 45° angle with common run.

45°45°

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Hip Ridge Length

45°45°

Thus adding two of them will equal the Building Width.

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Hip Ridge Length

45°45°

Thus adding two of them will equal the Building Width.

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Hip Ridge Length

45°45°

Thus adding two of them will equal the Building Width.

Length minus Width equals Ridge Length.

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There are two styles of framing hips at the ridge.

Framing Methods

Ridge

Com

mon

Hip

Hip

Com

mon

Common

Hip

Hip

Com

mon

Com

mon

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One where a common rafter butts the ridge.

Another with no common abutting the ridge.

Framing Methods

Ridge

Com

mon

Hip

Hip

Com

mon

Common

Hip

Hip

Com

mon

Com

mon

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The subtraction that yields the ridge length is theoretical.

Actual Ridge Length

Actual length is longer

Theoretical Length

The amount of lengthening depends on framing style

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¾″ longer when a common rafter butts the ridge.

Actual Ridge Length

¾″

1 13/16″ longer when no common rafter exists.

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¾″ longer when a common rafter butts the ridge.

Actual Ridge Length

¾″

1 13/16″ longer when no common rafter exists.

¾″

1 1/16″

A total of 1 13/16″

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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.