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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

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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

  • Half Span

  • Common Rafter


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


Lay out of Hip & V Roof

Roof Pitch = 25⁰

  • What Members define Creeper side cut

  • Half Span

  • Common Rafter


Lay out of Broken Hip Roof

Roof Pitch = 25⁰

No new bevels need to be developed


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


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


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


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


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


Common Rafter – Major SpanPlumb Cut

1.489

1.103

0.466

1.000

√2

Plumb Cut


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


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


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


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


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


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


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


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.


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


Hip Rafter – Major SpanPlumb Cut

1.489

1.103

0.466

1.000

√2

Plumb Cut


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


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


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


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


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


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


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


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


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


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


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


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.


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


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


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


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


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


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


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


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


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


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


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


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


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


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


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


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


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


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


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


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


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


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


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


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


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


Broken Hip Edge CorrectionAt Base


Broken Hip Edge CorrectionAt Base


Valley at Base of Broken Hip


Valley at Base of Broken Hip


Broken Hip Edge Correctionat Top


Broken Hip Edge Correctionat Top


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


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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