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Broken Hip Roof






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Broken Hip Roof. Lay out of Hip & Valley Roof. Roof Pitch = 25⁰. Lay out of Hip & Valley Roof. Roof Pitch = 25⁰. What Members define Creeper side cut . Lay out of Hip & Valley Roof. Roof Pitch = 25⁰. What Members define Valley Creeper side cut . What Members define Creeper side cut
Broken Hip Roof

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Slide 1

Broken Hip Roof

Slide 2

Lay out of Hip & Valley Roof

Roof Pitch = 25⁰

Slide 3

Lay out of Hip & Valley Roof

Roof Pitch = 25⁰

What Members define Creeper side cut

Slide 4

Lay out of Hip & Valley Roof

Roof Pitch = 25⁰

What Members define Valley Creeper side cut

  • What Members define Creeper side cut

  • Half Span

  • Common Rafter

Slide 5

Lay out of Hip & Valley Roof

Roof Pitch = 25⁰

  • What Members define Valley Creeper side cut

  • Half Span

  • Common Rafter

  • What Members define Creeper side cut

  • Half Span

  • Common Rafter

Slide 6

Lay out of Hip & V Roof

Roof Pitch = 25⁰

  • What Members define Creeper side cut

  • Half Span

  • Common Rafter

Slide 7

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

No new bevels need to be developed

Slide 8

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

All Bevels and edge cuts are the same as a hip roof

Broken Hip

As Span is not the same the rise will not be the same

Slide 9

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

Hip Rafter Minor Span

Crown End Minor Span

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Common Rafter Major Span

Common Rafter Minor Span

Hip Rafter Major Span

Valley Rafter Minor Span

Centring Rafter Minor Span

Crown End Major Span

Crippled Centring Rafter

Broken Hip

Centring Rafter Major Span

Gathering Point

Slide 10

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

With the more complex roof a roof is. It is important to plan & determine as much of the roof offsite that you can

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Slide 11

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

1.489

1.103

0.466

1.000

Determine Required LengthsCommon Rafter Major Span =

√2

Slide 12

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

1.489

1.103

0.466

1.000

Determine Required LengthsCommon Rafter Major Span

= Plan Length x Rafter Length / m

= (1000 – 17.5) x 1.103

= 982.5 x 1.103

= 1084

√2

Slide 13

Common Rafter – Major SpanPlumb Cut

1.489

1.103

0.466

1.000

√2

Plumb Cut

Slide 14

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

1.489

1.103

0.466

1.000

Determine Required LengthsCommon Rafter Major Span = 1084

Common Rafter Minor Span =

√2

Slide 15

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

1.489

1.103

0.466

1.000

Determine Required LengthsCommon Rafter Major Span = 1084

Common Rafter Minor Span

= Plan Length x Rafter Length / m

= (675 – 17.5) x 1.103

= 657.5 x 1.103

= 725

√2

Slide 16

Common Rafter – Minor SpanPlumb Cut

  • As Major & Minor Span are the same pitch the plumb cuts must be the same

1.489

1.103

0.466

1.000

√2

Plumb Cut

Slide 17

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

1.489

1.103

0.466

1.000

Determine Required LengthsCommon Rafter Major Span = 1084

Common Rafter Minor Span = 725

Rise Main Roof

= (½ Span – ½ Ridge) x Rise / m

= (1000 – 17.5) x 0.466

= 982.5 x 0.466

= 458

√2

Slide 18

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

1.489

1.103

0.466

1.000

Determine Required LengthsCommon Rafter Major Span = 1084

Common Rafter Minor Span = 725

Rise Main Roof = 458

= (½ Span Major – ½ Ridge) x Rise / m

= (1000 – 17.5) x 0.466

= 982.5 x 0.466

= 458

√2

Slide 19

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

1.489

1.103

0.466

1.000

Determine Required LengthsCommon Rafter Major Span = 1084

Common Rafter Minor Span = 725

Rise Main Roof = 458

Rise Minor Roof =

= (½ Span Minor – ½ Ridge) x Rise / m

= (675 – 17.5) x 0.466

= 657.5 x 0.466

= 306

√2

Slide 20

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

1.489

1.103

0.466

1.000

Determine Required LengthsCommon Rafter Major Span = 1084

Common Rafter Minor Span = 725

Rise Main Roof = 458

Rise Minor Roof = 306

√2

Slide 21

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

To develop other Roofing Members we need to determine the plan length first

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

We recall that all hips & valleys bisect corners.

In this building it means that they are at 45⁰.

Slide 22

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

1.489

1.103

0.466

1.000

Determine Required LengthsCommon Rafter Major Span = 1084

Common Rafter Minor Span = 725

Rise Main Roof = 458

Rise Minor Roof = 306

Hip Length Major Span

= Plan Length Crown End Rafter x Hip length/m

= (1000 – 17.5) x 1.489

= 982.5 x 1.489

= 1.463

√2

Slide 23

Hip Rafter – Major SpanPlumb Cut

1.489

1.103

0.466

1.000

√2

Plumb Cut

Slide 24

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

1.489

1.103

0.466

1.000

Determine Required LengthsCommon Rafter Major Span = 1084

Common Rafter Minor Span = 725

Rise Main Roof = 458

Rise Minor Roof = 306

Hip Length Major Span = 1.463

Hip Length Minor Span =

= Plan Length Crown End Rafter x Hip length/m

= (0.675 – 17.5) x 1.489

= 657.5 x 1.489

= 979

√2

Slide 25

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

1.489

1.103

0.466

1.000

Determine Required LengthsCommon Rafter Major Span = 1084

Common Rafter Minor Span = 725

Rise Main Roof = 458

Rise Minor Roof = 306

Hip Length Major Span = 1.463

Hip Length Minor Span =

= Plan Length Crown End Rafter x Hip length/m

= (0.675 – 17.5) x 1.489

= 657.5 x 1.489

= 979

√2

Valley is the same as the hip

Slide 26

Hip Rafter – Minor SpanPlumb Cut

  • As Major & Minor Span are the same pitch the plumb cuts must be the same

1.489

1.103

0.466

1.000

√2

Plumb Cut

Slide 27

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

Determine Centreline LengthCommon Rafter Major Span = 1084

Common Rafter Minor Span = 725

Rise Main Roof = 458

Rise Minor Roof = 306

Hip Length Major Span = 1.463

Hip Length Minor Span = 979

1st Creeper Major

Plan Length = ½ Span – Spacing + Correction

= 1000 – 300 + (1.414 x -17.5 + 17.5)

= 693 x Rafter Length / m

= 693 x 1.103

= 764

1.489

1.103

0.466

1.000

√2

Note these measurements are directional as it goes back towards the Top Plate it must be a negative

Slide 28

Creepers– Major SpanPlumb Cut

  • Creepers are the same pitch as the Common Rafters. They must have the same Plumb Cut

1.489

1.103

0.466

1.000

√2

Plumb Cut

Slide 29

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

Determine Centreline LengthCommon Rafter Major Span = 1084

Common Rafter Minor Span = 725

Rise Main Roof = 458

Rise Minor Roof = 306

Hip Length Major Span = 1.463

Hip Length Minor Span = 979

1st Creeper Major = 764

1st Creeper Minor = 406

Plan Length = ½ Span – Spacing + Correction

= 675 – 300 + (1.414 x -17.5 + 17.5)

= 368 x Rafter Length / m

= 368 x 1.103

= 406

1.489

1.103

0.466

1.000

√2

Slide 30

Creepers– Minor SpanPlumb Cut

  • Creepers are the same pitch as the Common Rafters. They must have the same Plumb Cut

1.489

1.103

0.466

1.000

√2

Plumb Cut

Slide 31

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

Determine Required LengthsCommon Rafter Major Span = 1084

Common Rafter Minor Span = 725

Rise Main Roof = 458

Rise Minor Roof = 306

Hip Length Major Span = 1.463

Hip Length Minor Span = 979

1st Creeper Major = 764

1st Creeper Minor = 406

1st Valley Creeper = 698

Plan Length = ½ Span + Valley Correction – ½ Ridge

= 675 - (1.414 x -17.5 + 17.5) – 17.5

= 633 x Rafter Length / m

= 633 x 1.103

= 698

1.489

1.103

0.466

1.000

√2

Slide 32

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

Edge Bevel for Valley Creepers

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

What Triangle forms the Bevel

Slide 33

Crippled or Valley CreepersPlumb Cut

  • Creepers are the same pitch as the Common Rafters. They must have the same Plumb Cut

1.489

1.103

0.466

1.000

√2

Plumb Cut

Slide 34

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

To develop other Roofing Members we need to determine the plan length first

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Determine Crippled Centring Rafter

Slide 35

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

To develop other Roofing Members we need to determine the plan length first

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Determine Crippled Centring Rafter

We recall that all hips & valleys bisect corners.

In this building it means that they are at 45⁰.

Slide 36

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

To develop other Roofing Members we need to determine the plan length first

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Determine Crippled Centring Rafter

Hips at 45°

1000-675 = 325

½ Span Major – ½ Span Minor

Slide 37

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

To develop other Roofing Members we need to determine the plan length first

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Determine Crippled Centring Rafter

We recall that all hips & valleys bisect corners.

In this building it means that they are at 45⁰.

Therefore where the Broken Hip intersects the Ridge Minor Span must be 325mm from the Centreline of the Ridge Major Span

Slide 38

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

To develop other Roofing Members we need to determine the plan length first

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Determine Crippled Centring Rafter

Both Hips at 45°

1000-675 = 325

½ Span Major – ½ Span Minor

Slide 39

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

To develop other Roofing Members we need to determine the plan length first

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Determine Crippled Centring Rafter

= (½ Major Span – ½ Minor Span) x 2

Or

= Major Span – Minor Span

This must be 2x

This

Slide 40

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

To develop other Roofing Members we need to determine the plan length first

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Determine Crippled Centring Rafter

As the valley is at 45⁰ the intersection with the valley must be a further 325mm

Slide 41

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

Determine Required LengthsCommon Rafter Major Span = 1084

Common Rafter Minor Span = 725

Rise Main Roof = 458

Rise Minor Roof = 306

Hip Length Major Span = 1.463

Hip Length Minor Span = 979

1st Creeper Major = 764

1st Creeper Minor = 406

1st Valley Creeper = 698

Crippled Centring Rafter = 689

Plan Length = Major Span – Minor Span + Valley Correction – ½ Ridge

= 2000 – 1350 + (1.414 x -17.5 + 17.5) – 17.5

= 625 x Rafter Length / m

= 625 x 1.103

= 689

1.489

1.103

0.466

1.000

√2

Slide 42

Crippled Centring RafterPlumb Cut

  • Crippled Centring Rafter is the same pitch as the Common Rafters.

  • It must have the same Plumb Cut

1.489

1.103

0.466

1.000

√2

Plumb Cut

Slide 43

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

Edge Bevel for Crippled Centring Rafter

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

What Triangle forms the Bevel

Slide 44

Simple Bevel Development

From Previous

  • Plumb Bevel Rafter

  • Level Bevel Rafter

  • Edge Bevel Creeper

  • Edge Bevel Purlin

  • Plumb Bevel Hip

  • Level Bevel Hip

  • Edge Bevel Hip

  • Face Bevel Purlin

Slide 45

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

Every Valley Creeper must have an opposing creeper

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Slide 46

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

Every Valley Creeper must have an opposing creeper

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Slide 47

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

Every Valley Creeper must have an opposing creeper

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Slide 48

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

Every Valley Creeper must have an opposing creeper

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

From previous calculations we determined the following

Slide 49

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

Every Valley Creeper must have an opposing creeper

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Centreline length is the same as distance from the gathering point

Slide 50

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

Every Valley Creeper must have an opposing creeper

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

To determine true length Long Pt

Centreline length 325

+/- Long Point Correction -7.5

(-17.5 x 1.414 + 17.5)

Deduct ½ Ridge 17.5

Plan Length = 325 +-7.5 - 17.5

Slide 51

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

Determine Required LengthsCommon Rafter Major Span = 1084

Common Rafter Minor Span = 725

Rise Main Roof = 458

Rise Minor Roof = 306

Hip Length Major Span = 1.463

Hip Length Minor Span = 979

1st Creeper Major = 764

1st Creeper Minor = 406

1st Valley Creeper = 698

Crippled Centring Rafter = 689

Crippled Creeper Matching = 331

Plan Length = ½ Span Major – ½ Span Minor + Valley Correction – ½ Ridge

= 1000 – 675 + (1.414 x -17.5 + 17.5) – 17.5

= 300 x Rafter Length / m

= 300 x 1.103

= 331

1.489

1.103

0.466

1.000

√2

Slide 52

Crippled Matching RafterPlumb Cut

  • Crippled Matching Rafter is the same pitch as the Common Rafters.

  • It must have the same Plumb Cut

1.489

1.103

0.466

1.000

√2

Plumb Cut

Slide 53

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

Determine Required LengthsCommon Rafter Major Span = 1084

Common Rafter Minor Span = 725

Rise Main Roof = 458

Rise Minor Roof = 306

Hip Length Major Span = 1.463

Hip Length Minor Span = 979

1st Creeper Major = 764

1st Creeper Minor = 406

1st Valley Creeper = 698

Crippled Centring Rafter = 689

Crippled Creeper Matching = 331

Creeper Shortening = 331

Rafter Spacing x Rafter Length / m

= 300 x 1.103

= 331

1.489

1.103

0.466

1.000

√2

Slide 54

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

As both spans are the same pitch they are SIMILAR so Creeper Shortening is the same for both spans

Determine Required LengthsCommon Rafter Major Span = 1084

Common Rafter Minor Span = 725

Rise Main Roof = 458

Rise Minor Roof = 306

Hip Length Major Span = 1.463

Hip Length Minor Span = 979

1st Creeper Major = 764

1st Creeper Minor = 406

1st Valley Creeper = 698

Crippled Centring Rafter = 689

Crippled Creeper Matching = 331

Creeper Shortening = 331

Slide 55

Roof Pitch = 25⁰

Lay out of Broken Hip Roof

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Rafter Spacing 300mm

So the roofing members we have previously looked at are determined the same way

Determine Required LengthsCommon Rafter Major Span = 1084

Common Rafter Minor Span = 725

Rise Main Roof = 458

Rise Minor Roof = 306

Hip Length Major Span = 1.463

Hip Length Minor Span = 979

1st Creeper Major = 764

1st Creeper Minor = 406

1st Valley Creeper = 698

Crippled Centring Rafter = 689

Crippled Creeper Matching = 331

Creeper Shortening = 331

Slide 56

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

Edge Bevel for Crippled Centring Rafter

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Edge Bevel for Crippled Centring Rafter is the CREEPER EDGE BEVEL

  • The same is for

  • Valley Creepers

  • Crippled Creepers

Slide 57

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Edge Bevel for Crippled Centring Rafter is the CREEPER EDGE BEVEL

  • The same is for

  • Valley Creepers

  • Crippled Creepers

It follows that all the

The purlin bevels are

The same as the hip end

Slide 58

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

Determine Centreline Length

Broken Hip

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

Slide 59

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

Broken Hip Run

325 x 1.414 = 460

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

1.489

1.103

0.466

1.000

√2

Determine Plan Centreline Length = 325

Slide 60

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

Broken Hip Run

325 x 1.414 = 460

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

1.489

1.103

0.466

1.000

√2

Determine Plan Centreline Length = 325

Centreline True Length

= Plan Length x Hip Rafter / m

= 325 x 1.489

= 484

Slide 61

Broken Hip Edge CorrectionAt Base

Slide 62

Broken Hip Edge CorrectionAt Base

Slide 63

Valley at Base of Broken Hip

Slide 64

Valley at Base of Broken Hip

Slide 65

Broken Hip Edge Correctionat Top

Slide 66

Broken Hip Edge Correctionat Top

Slide 67

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

Plumb cut is the same as the hip

Edge Bevels are the same as the hip

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35

1.489

1.103

0.466

1.000

√2

Slide 68

Lay out of Broken Hip Roof

Roof Pitch = 25⁰

With the more complex roof a roof is. It is important to plan & determine as much of the roof offsite that you can

Rafter 90 x 35 @ 450 c to c

Hip Rafters 140 x 35

Ridge 140 x 35


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