# new learning resource Adv Roofs V1

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```					                  Randwick Carpentry

BCGCA3009B

Student Learning Resource

RANDWICK COLLEGE                   ADV. ROOF / 2008 / V1
Carpentry & Joinery
Publishing Details:

These notes were prepared and compiled by
Michael Martin, Randwick TAFE College, to
be used in conjunction with existing publications
as a student workbook / learning recourse. There
is a combination of new notes together with

Accompanying Text:

These notes have no accompanying text as such,
they will be used as the main text and workbook
combined.

A good reference text for advanced roofing is
“Practical Australian Carpentry” book 2, section 10

First Published February 2008

Copyright of this material is reserved to TAFE NSW Randwick College. Reproduction or
transmittal in whole or part, other than for the purposes and subject to the provision of the
Copyright Act, is prohibited without the written authority of TAFE NSW.

2
CONTENTS

The following pages have been compiled from a combination of existing text and TAFE
notes:

One:        Revision

Two:        Roof Shapes

Three:      Oblique Hip & Skew Gable

Four:       Extract from Practical Australian Carpentry

Five:       Octagonal Roof

Six:        Additional notes on the dormer roof

Seven:      Clerestory Roof & unequal pitches

3
Revision
Develop and name all the bevels needed to cut the hipped roof shown below.

4
Calculate the centre line length and the order length for the common rafters for the roof
shown below:

Roof Pitch:             28°

8.420
0.150   0.450

1. Rise per / m run

2. True length of common rafter per / m

3. Centre line length

4. Order length

5
Calculate the centre line length and the order length for the common rafters for the roof
with the following specifications:

Major Span:         7.340m
Minor Span:         4.200m
Eave Width:         0.600m
Roof Pitch:         30°

6
Roof Shapes

On the plan below, indicate the position of the hips, valleys and ridge, then complete the
elevation:

Roof Pitch 30°

Elevation

Plan

7
On the plan below, indicate the position of the hips, valleys and ridge, then complete the
elevation:

Roof Pitch 30°

Elevation

Gable End

Hip End

Plan

8
On the plan below, indicate the position of the hips, valleys and ridge, then complete the
elevation:

Roof Pitch 30°

Elevation

Plan

9
Oblique Hip & Skew Gable
The following notes are taken from old course notes 5158, and have simply been re-
typed for clarity with existing images.

Buildings are often designed to irregular roof shapes
on plan to suit site conditions. The boundaries of
some building sites are formed by acute or obtuse
angles. Other sites may have their front or side
boundaries out of parallel. To obtain maximum use
of the land, the buildings are often irregular shaped
similar to the site.

10
RIDGE GATHERING DETAIL

When setting out the position of the roof members
on the top plates, the same procedure is followed
as for a conventional hip roof with 90° external
corners.

11
Method for setting out position of Crown End and Centring Rafters.

1. Lengths of oblique end and
offset established

Example:        Oblique End = 6.400
Offset      = 3.800

2.

3.

4.

12
POSITION OF CENTRING RAFTERS

5.

6.

POSITION OF CROWN END RAFTER

7.

8.

13
OBLIQUE HIP & SKEW GABLE ROOF

BEVELS FOR RAFTERS:

BEVELS
1.

2.

3.

4.

5.

6.

14
BEVELS FOR GABLE RAFTERS:

BEVELS
1.

2.

3.

4.

15
BEVELS FOR HIPS:

BEVELS
1.

2.

3.

4.

5.

6.
16
BEVELS FOR PURLINS:

BEVELS
1.

2.

3.

4.

5.

6.

17
DRAWING:

On an A3 drawing sheet, draw the plan and section of an oblique hip and skew gable
roof to the given specification and develop all the bevels for the roof.

Scale

Rafter Size

Ridge & Hips

Rafter Spacings

Top Plate Size

Pitch                        30°

Purlins

18
PRACTICAL:

Construct the oblique hip and / or skew gable from your just completed drawing, Rafter
lengths and bevels can be obtained from the drawing.

Notes:
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19
Revision: show on the centre lines below the members (and name them) at the
gathering point for the hips, rafters & ridge for an oblique hipped roof.

Rafters            100 x 38
Ridge & Hips       125 x 25
Scale              1:5

20
The Following pages is an extract from the book
“Practical Australian Carpentry”

21
22
23
24
25
26
27
28
29
Octagonal Roof

Although octagonal roofs are not commonly
used today, the occasion may arise during
the construction of an extension to a house
where the existing roof shape is to be
maintained. The basic principles used with
square hipped roofs are applied to member
set out and bevel development.

30
Building Geometry & Drawing:

31
32
WORKSHOP JOB:

33
BEVELS:

34
35
36

37
The Dormer Roof

The following sketches have come from either Practical Australian Carpentry or other
trade text, they will give you a clear understanding about the construction of this type of
roof.

38
39
40
41
42
The following pictures show flashing details around a window frame

Timber

43
44
Aluminium

45

46
Clerestory Roof

47
Roofs with unequal pitch: a section from Practical Australian Carpentry.

48
49
50
51
52
53

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