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Timber Roof Construction Guide

This document summarizes the calculations required for different timber-framed roof members based on Australian standard AS 1684.4-2010 for non-cyclonic areas. It lists the parameters needed such as joist spacing, span, stress grade, and roof type for ceiling joists, hanging beams, counter beams, combined strutting/hanging beams, rafters, roof battens and other components. Reference figures and tables are provided for determining member sizes.

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280 views2 pages

Timber Roof Construction Guide

This document summarizes the calculations required for different timber-framed roof members based on Australian standard AS 1684.4-2010 for non-cyclonic areas. It lists the parameters needed such as joist spacing, span, stress grade, and roof type for ceiling joists, hanging beams, counter beams, combined strutting/hanging beams, rafters, roof battens and other components. Reference figures and tables are provided for determining member sizes.

Uploaded by

sameh_yehia_2
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Residential Timber - Framed Construction

AS 1684.4 - 2010
Part 4: Simplified--Non-Cyclonic Areas
Summary of Calculations for different members
Roof member Fig. no. & Page No. Table no. & page no. Required Paremeters Notes
1- Joist Spacing 600
A12 A27 2- Joist Span 3600
Ceiling Joist
Page 155 Page 155
3- Timber Stress Grade S-F5
4- Span Type (simple or Continuous) single

1- Ceiling Joist Span 3000


A13 A28
Hanging Beam 2- Hanging Beam Span 3600
Page 156 Page 156
3- Timber Stress Grade MGP10

1- Counter Beam Span 3000


A14 A29
Counter Beam 2- Hanging Beam Span 3000
Page 158 Page 158
3- Timber Stress Grade F11

Combined 1- Roof Type (sheet or tile) tile


A15 A30 Rafter span <= 3000
Strutting/Hanging 2- Combined strutting / Hanging Beam Span 2400
Page 159 Page 159 Ceiling Joist span <= 3000
Beam
3- Timber Stress Grade MGP10

1- Roof Type (sheet or tile) tile


Combined A31
A16 2- Counter strutting Beam Span 3000
Counter/Strutting Page 160 (sheet roof)
Page 160
Beams Page 161 (Tile roof) 3- Hanging Beam Span 2400
4- Timber Stress Grade MGP10

1- Roof Type (sheet or tile) sheet


A18 A33 Continuous Span
UnderPurlin 2- Strut spacing 1200
Page 164 Page 164 Rafter span <= 3000
3- Timber Stress Grade MGP10

1- Roof Type (sheet or tile)


A34 2- Rafter Spacing Coubled Roofs
Rafters A19
Page 165 (sheet roof) 3- Rafter Span Continuous span
Coupled Roof Page 165
Page 166 (Tile roof) i.e. there is an underperlin
4- Timber Stress Grade
5- Check max overhang

1- Roof Type (sheet or tile)


2- Rafter Spacing Non-Coubled Roofs
A35
Rafters A20 (Cathedral Roofs)
Page 167 (sheet roof) 3- Rafter Span
Non-Coupled Roof Page 167 Single span
Page 168 (Tile roof)
4- Timber Stress Grade i.e. without underperlin

5- Check max overhang

1- Roof Type (sheet or tile)


A22 A37 2- Rafter Spacing
Roof Battens
Page 171 Page 171
3- Batten spacing
4- Timber Stress Grade
Other Members and Components
1- Depth not less than length of the rafter plumb- Plumb cut =
cut x 19 thick
Table 7.5
Ridgeboards 2- Round up to the next avalable depth   

Page 79 - Available widths for MGP are 70, 90, 120, 140,
cos 

170, 190, 240, 270, 290
1- Rafter Depth + 50 x rafter width Stress grade less than F11 /
2- Round up to the next avalable depth MGP 15
Table 7.5
Hip / Vally Refters - Available widths for MGP are 70, 90, 120, 140,
Page 79
170, 190, 240, 270, 290

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