Presentation 22:

1

Presentation 22:

HIP RIDGE THEORY AND LENGTHENING

2

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

3

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′

4

Therefore the common runs are equal.

Hip Ridge Length

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

45°45°

5

Hip Ridge Length

45°45°

Thus adding two of them will equal the Building Width.

6

Hip Ridge Length

45°45°

Thus adding two of them will equal the Building Width.

7

Hip Ridge Length

45°45°

Thus adding two of them will equal the Building Width.

Length minus Width equals Ridge Length.

8

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

9

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

10

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

11

¾″ longer when a common rafter butts the ridge.

Actual Ridge Length

¾″

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

12

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″

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.