Conventional Roof Framing

1
Conventional Roof Framing   Class Exercise 1 -
300             Residential Studies
Certificate IV 2182D

2
Using the Floor Plan Details provided
complete the Preliminary Calculations so that
the most economical Size, Span and Spacing Of
the Ceiling and Roof members can be achieved.
3
Floor Plan Class Exercise 1
Note Hyspan LVL Strutting Beams to Living/Family
Living/Dining rooms as shown
4
Preliminary Calculations
Common Rafter
True Length of Common Rafter Pitch 300
Half Span 7.570 0.150 2 3.635m
Rise 30 Tan x 3.635 2.099m
TLCR 4.197
Rise 2.099
TLCR 3.635 30cos
4.197m
300
Half Span 3.635
5
Calculate Common Rafter Span - RLW
2.098
4.197
2.098
RLW 4.197 2 2.098m
RLW 2.098m Say 2.100m
6
Calculate Eaves Overhang Eaves RLW
TL O/Hang 0.450 0.150 COS 30
0.693m
0.693m
RLW Eaves 0.693m
0.150
0.450
7
Strut
Calculate Fan Struts
2.1
2.098
Strut Tan30 x 2.098 1.211
2.098
0.693
Strut
1.211
8
Calculate Fan Strut Length
1.211
1.211
Fan Strut ? 1.2112 1.2112
1.713m or 1.211
cos 45 1.713m
1.211
1.713
1.713
Half Spread Fan Strut 1.211m Fan Strut Length
1.713m
9
Calculate Distance X.
2.098
2.098
0.693
Run of rafter 3.635
Distance X is the distance From the inside of the
plate to the centre of the underpurlin. The
Formula is Run of rafter divided by 2 minus the
width of the wall plate
3.635 / 2 1.818 1.818 90 1728
10
Summary
Rafter Span 2.098 Say 2.100 RLW
Underpurlin 2.1
Eaves Overhang 0.693
Distance X 1.728
Half spread of the fan strut 1.211 Full spread
of the fan strut 2.422 Length of strut 1.713
11
Using the information from the Preliminary
Calculations The Job Specification Fill in
the Project job sheets to arrive at final design
requirements.
12
General Information from Project Details
Member Rule/Table Size Comments
Timber Species Timber Grade Supp. No. Roof Mass Type/Construct. Floor to Ceiling height Eaves Width
Fill in comments column with information from
project specification
13
General Information from Project Details
Member Rule/Table Size Comments
Timber Species Timber Grade Supp. No. Roof Mass Type/Construct. Floor to Ceiling height Eaves Width
Seasoned S/Wood
Fill in comments column with information from
project specification
14
General Information from Project Details
Member Rule/Table Size Comments
Timber Species Timber Grade Supp. No. Roof Mass Type/Construct. Floor to Ceiling height Eaves Width
Seasoned S/Wood
MGP 15
Fill in comments column with information from
project specification
15
General Information from Project Details
Member Rule/Table Size Comments
Timber Species Timber Grade Supp. No. Roof Mass Type/Construct. Floor to Ceiling height Eaves Width
Seasoned S/Wood
MGP 15
6 N3
Fill in comments column with information from
project specification
16
General Information from Project Details
Member Rule/Table Size Comments
Timber Species Timber Grade Supp. No. Roof Mass Type/Construct. Floor to Ceiling height Eaves Width
Seasoned S/Wood
MGP 15
6 N3
10Kg/m2
Fill in comments column with information from
project specification
17
General Information from Project Details
Member Rule/Table Size Comments
Timber Species Timber Grade Supp. No. Roof Mass Type/Construct. Floor to Ceiling height Eaves Width
Seasoned S/Wood
MGP 15
6 N3
10Kg/m2
Conventional
Fill in comments column with information from
project specification
18
General Information from Project Details
Member Rule/Table Size Comments
Timber Species Timber Grade Supp. No. Roof Mass Type/Construct. Floor to Ceiling height Eaves Width
Seasoned S/Wood
MGP 15
6 N3
10Kg/m2
Conventional
2.700
Fill in comments column with information from
project specification
19
General Information from Project Details
Member Rule/Table Size Comments
Timber Species Timber Grade Supp. No. Roof Mass Type/Construct. Floor to Ceiling height Eaves Width
Seasoned S/Wood
MGP 15
6 N3
10Kg/m2
Conventional
2.700
0.450
Fill in comments column with information from
project specification
20
Using A.S. 1684.2 (2006) Section 7 Roof Framing
1. Obtain information for Ceiling Joists to
complete job sheet.
Member Rule/Table Size Comments
Ceiling Joists R T R 90 x 35 Single Span Continuous Span (over more than 1 span)
7.2.4
7.3.6

1. Page 81 rule 7.2.4 ceiling joists (building
   practice)

2. Page 98 rule 7.3.6 ceiling joists (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
21
Using A.S. 1684.2 (2006) Section 7 Roof Framing
1. Obtain information for Ceiling Joists to
complete job sheet.
Member Rule/Table Size Comments
Ceiling Joists R T R 90 x 35 1200c/c Single Span Continuous Span (over more than 1 span)
7.2.4
21
7.3.6

1. Page 81 rule 7.2.4 ceiling joists (building
   practice)

2. Page 98 rule 7.3.6 ceiling joists (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Find allowable spans for 90 x 35 MGP15
ceiling joists from table 21 supp. 6
22
Using A.S. 1684.2 (2006) Section 7 Roof Framing
1. Obtain information for Ceiling Joists to
complete job sheet.
Member Rule/Table Size Comments
Ceiling Joists R T R 90 x 35 1200c/c Single Span Continuous Span (over more than 1 span)
2.400
7.2.4
21
7.3.6

1. Page 81 rule 7.2.4 ceiling joists (building
   practice)

2. Page 98 rule 7.3.6 ceiling joists (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Find allowable spans for 90 x 35 MGP15
ceiling joists from table 21 supp. 6
23
Using A.S. 1684.2 (2006) Section 7 Roof Framing
1. Obtain information for Ceiling Joists to
complete job sheet.
Member Rule/Table Size Comments
Ceiling Joists R T R 90 x 35 1200c/c Single Span Continuous Span (over more than 1 span)
2.400
7.2.4
21
2.800
7.3.6

1. Page 81 rule 7.2.4 ceiling joists (building
   practice)

2. Page 98 rule 7.3.6 ceiling joists (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Find allowable spans for 90 x 35 MGP15
ceiling joists from table 21 supp. 6
24
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R Bedroom 1 Bedroom 2 Bedroom 3 Bath / WC Laundry Kitchen Dining Family Living Entry
7.2.5
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
25
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R Bedroom 1 Bedroom 2 Bedroom 3 Bath / WC Laundry Kitchen Dining Family Living Entry
7.2.5
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
26
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R Bedroom 1 Bedroom 2 Bedroom 3 Bath / WC Laundry Kitchen Dining Family Living Entry
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
27
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R 140 x 35 Bedroom 1 Bedroom 2 Bedroom 3 Bath / WC Laundry Kitchen Dining Family Living Entry
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
28
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R 140 x 35 Bedroom 1 Bedroom 2 3.500 1.250 Bedroom 3 Bath / WC Laundry Kitchen Dining Family Living Entry
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
29
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R 140 x 35 140 x 35 Bedroom 1 Bedroom 2 3.500 1.250 Bedroom 3 Bath / WC Laundry Kitchen Dining Family Living Entry
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
30
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R 140 x 35 140 x 35 Bedroom 1 Bedroom 2 3.500 1.250 Bedroom 3 2.400 1.750 Bath / WC Laundry Kitchen Dining Family Living Entry
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
31
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R 140 x 35 140 x 35 90 x 35 Bedroom 1 Bedroom 2 3.500 1.250 Bedroom 3 2.400 1.750 Bath / WC Laundry Kitchen Dining Family Living Entry
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
32
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R 140 x 35 140 x 35 90 x 35 ________ Bedroom 1 Bedroom 2 3.500 1.250 Bedroom 3 2.400 1.750 Bath / WC NA Laundry Kitchen Dining Family Living Entry
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
33
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R 140 x 35 140 x 35 90 x 35 ________ ________ Bedroom 1 Bedroom 2 3.500 1.250 Bedroom 3 2.400 1.750 Bath / WC NA Laundry NA Kitchen Dining Family Living Entry
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
34
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R 140 x 35 140 x 35 90 x 35 ________ ________ Bedroom 1 Bedroom 2 3.500 1.250 Bedroom 3 2.400 1.750 Bath / WC NA Laundry NA Kitchen 3.540 1.750 Dining Family Living Entry
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
35
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R 140 x 35 140 x 35 90 x 35 ________ ________ 140 x 35 Bedroom 1 Bedroom 2 3.500 1.250 Bedroom 3 2.400 1.750 Bath / WC NA Laundry NA Kitchen 3.540 1.750 Dining Family Living Entry
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
36
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R 140 x 35 140 x 35 90 x 35 ________ ________ 140 x 35 Bedroom 1 Bedroom 2 3.500 1.250 Bedroom 3 2.400 1.750 Bath / WC NA Laundry NA Kitchen 3.540 1.750 Dining 3.690 1.750 Family Living Entry
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
37
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R 140 x 35 140 x 35 90 x 35 ________ ________ 140 x 35 140 x 35 Bedroom 1 Bedroom 2 3.500 1.250 Bedroom 3 2.400 1.750 Bath / WC NA Laundry NA Kitchen 3.540 1.750 Dining 3.690 1.750 Family Living Entry
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
38
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R 140 x 35 140 x 35 90 x 35 ________ ________ 140 x 35 140 x 35 Bedroom 1 Bedroom 2 3.500 1.250 Bedroom 3 2.400 1.750 Bath / WC NA Laundry NA Kitchen 3.540 1.750 Dining 3.690 1.750 Family 2.740 1.750 Living Entry
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
39
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R 140 x 35 140 x 35 90 x 35 ________ ________ 140 x 35 140 x 35 120 x 35 Bedroom 1 Bedroom 2 3.500 1.250 Bedroom 3 2.400 1.750 Bath / WC NA Laundry NA Kitchen 3.540 1.750 Dining 3.690 1.750 Family 2.740 1.750 Living Entry
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
40
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R 140 x 35 140 x 35 90 x 35 ________ ________ 140 x 35 140 x 35 120 x 35 Bedroom 1 Bedroom 2 3.500 1.250 Bedroom 3 2.400 1.750 Bath / WC NA Laundry NA Kitchen 3.540 1.750 Dining 3.690 1.750 Family 2.740 1.750 Living 3.690 1.750 Entry
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
41
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R 140 x 35 140 x 35 90 x 35 ________ ________ 140 x 35 140 x 35 120 x 35 140 x 35 Bedroom 1 Bedroom 2 3.500 1.250 Bedroom 3 2.400 1.750 Bath / WC NA Laundry NA Kitchen 3.540 1.750 Dining 3.690 1.750 Family 2.740 1.750 Living 3.690 1.750 Entry
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
42
2. Obtain information for Hanging Beams
Member Rule/Table Size Comments Room Span CLW
Hanging Beams R T R 140 x 35 140 x 35 90 x 35 ________ ________ 140 x 35 140 x 35 120 x 35 140 x 35 ________ Bedroom 1 Bedroom 2 3.500 1.250 Bedroom 3 2.400 1.750 Bath / WC NA Laundry NA Kitchen 3.540 1.750 Dining 3.690 1.750 Family 2.740 1.750 Living 3.690 1.750 Entry NA
7.2.5
3.500 1.750
23
7.3.7

1. Page 82 rule 7.2.5 Hanging Beams (building
   practice)

2. Page 99 rule 7.3.7 Hanging Beams (member
sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
4. Determine Hanging Beams to rooms from
table 23 supp. 6, MGP15
43
3. Obtain information for Rafters
Member Rule/Table Size Comments
Common Rafter R T R Rafter Spacing RLW Eaves O/Hang Underpurlin is mid-span of Rafter
7.2.11
7.3.13
Fill in comments column with information from
project specification Prelim. Calcs.

1. Page 86 rule 7.2.11 Rafters (building practice)

2. Page 105 rule 7.3.13 Rafters (member sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)
44
3. Obtain information for Rafters
Member Rule/Table Size Comments
Common Rafter R T R Rafter Spacing RLW Eaves O/Hang Underpurlin is mid-span of Rafter
7.2.11
29
7.3.13
Fill in comments column with information from
project specification Prelim. Calcs.

1. Page 86 rule 7.2.11 Rafters (building practice)

2. Page 105 rule 7.3.13 Rafters (member sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)

• Determine Rafter Size from table 29 supp. 6,
  MGP15, N3
• (Check - single or continuous span - roof mass
  span O/hang)

45
3. Obtain information for Rafters
Member Rule/Table Size Comments
Common Rafter R T R Rafter Spacing RLW Eaves O/Hang Underpurlin is mid-span of Rafter
1.200
7.2.11
29
7.3.13
Fill in comments column with information from
project specification Prelim. Calcs.

1. Page 86 rule 7.2.11 Rafters (building practice)

2. Page 105 rule 7.3.13 Rafters (member sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)

• Determine Rafter Size from table 29 supp. 6,
  MGP15, N3
• (Check - single or continuous span - roof mass
  span O/hang)

46
3. Obtain information for Rafters
Member Rule/Table Size Comments
Common Rafter R T R Rafter Spacing RLW Eaves O/Hang Underpurlin is mid-span of Rafter
1.200
7.2.11
2.100
29
7.3.13
Fill in comments column with information from
project specification Prelim. Calcs.

1. Page 86 rule 7.2.11 Rafters (building practice)

2. Page 105 rule 7.3.13 Rafters (member sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)

• Determine Rafter Size from table 29 supp. 6,
  MGP15, N3
• (Check - single or continuous span - roof mass
  span O/hang)

47
3. Obtain information for Rafters
Member Rule/Table Size Comments
Common Rafter R T R Rafter Spacing RLW Eaves O/Hang Underpurlin is mid-span of Rafter
1.200
7.2.11
2.100
29
0.693
7.3.13
Fill in comments column with information from
project specification Prelim. Calcs.

1. Page 86 rule 7.2.11 Rafters (building practice)

2. Page 105 rule 7.3.13 Rafters (member sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)

• Determine Rafter Size from table 29 supp. 6,
  MGP15, N3
• (Check - single or continuous span - roof mass
  span O/hang)

48
3. Obtain information for Rafters
Member Rule/Table Size Comments
Common Rafter R T R Rafter Spacing RLW Eaves O/Hang Underpurlin is mid-span of Rafter
1.200
7.2.11
140 x 45
2.100
29
0.693
7.3.13
Fill in comments column with information from
project specification Prelim. Calcs.

1. Page 86 rule 7.2.11 Rafters (building practice)

2. Page 105 rule 7.3.13 Rafters (member sizes)
3. Determine Span Table of supplements (supp.
6, N3, s/softwood, MGP 15)

• Determine Rafter Size from table 29 supp. 6,
  MGP15, N3
• (Check - single or continuous span - roof mass
  span O/hang)

49
4. Obtain information for Collar Ties
Member Rule/Table Size Comments
Collar Ties R T or Length
7.2.16 7.3.17
Check section 7 (Roof Framing) for information
rules tables for Collar Ties
Note Find rules relating to Collar Ties.
Page 90 Rule 7.2.16 Page 109, Rule 7.3.17
Other members or Components, states that Table
7.6 give details for miscellaneous roof
framing members not given in span tables of
the supplements.
50
4. Obtain information for Collar Ties
Member Rule/Table Size Comments
Collar Ties R T or Length
7.2.16 7.3.17
7.6 (page 110)
Check section 7 (Roof Framing) for information
rules tables for Collar Ties
Note Find rules relating to Collar Ties.
Page 90 Rule 7.2.16 Page 109, Rule 7.3.17
Other members or Components, states that Table
7.6 give details for miscellaneous roof
framing members not given in span tables of
the supplements.
Page 110, Table 7.6 Collar Ties gives required
Information
51
4. Obtain information for Collar Ties
Member Rule/Table Size Comments
Collar Ties R T or Length
3.635
7.2.16 7.3.17
7.6 (page 110)
Check section 7 (Roof Framing) for information
rules tables for Collar Ties
Note Find rules relating to Collar Ties.
Page 90 Rule 7.2.16 Page 109, Rule 7.3.17
Other members or Components, states that Table
7.6 give details for miscellaneous roof
framing members not given in span tables of
the supplements.
Page 110, Table 7.6 Collar Ties gives required
Information
Refer to floor plan to calculate length of collar
tie 7.270 / 2 3.635
52
4. Obtain information for Collar Ties
Member Rule/Table Size Comments
Collar Ties R T 70 x 35 Length
3.635
7.2.16 7.3.17
7.6 (page 110)
Check section 7 (Roof Framing) for information
rules tables for Collar Ties
Note Find rules relating to Collar Ties.
Page 90 Rule 7.2.16 Page 109, Rule 7.3.17
Other members or Components, states that Table
7.6 give details for miscellaneous roof
framing members not given in span tables of
the supplements.
Page 110, Table 7.6 Collar Ties gives required
Information
Refer to floor plan to calculate length of collar
tie 7.270 / 2 3.635
53
5. Obtain information for Ridge board
Member Rule/Table Size Comments
Ridge R T Not Strutted
7.2.12
Check section 7 (Roof Framing) for information
rules tables for Ridge boards
Note Find rules relating to Ridge boards
54
5. Obtain information for Ridge board
Member Rule/Table Size Comments
Ridge R T Not Strutted
7.2.12
7.6 (page 110)
Check section 7 (Roof Framing) for information
rules tables for Ridge boards
Note Find rules relating to Ridge boards
Page 86, Rule 7.2.12 The size of Ridge boards
shall be determined from Table 7.6
Table 7.6 Ridge boards Refers to Unstrutted
ridges in coupled roofs has having a depth not
less than length of Rafter
Plumb-Cut x 19mm thick
55
Refer Table 7.6 (AS 1684.2) page 110, Ridge
depth rafter plumb cut x 19mm thick. Therefore
use 170 x 19 MGP 15 S/wood.
0.162
Rafter 140 x 45 MGP 15 Seasoned Softwood
Length of Plumb Cut
Length of Plumb cut Rafter Depth
Cos. Roof Pitch
0.140 Cos. 300 0.162
0.140
56
5. Obtain information for Ridge board
Member Rule/Table Size Comments
Ridge R T Not Strutted
7.2.12
170 x 19
7.6 (page 110)
Check section 7 (Roof Framing) for information
rules tables for Ridge boards
Note Find rules relating to Ridge boards
Page 86, Rule 7.2.12 The size of Ridge boards
shall be determined from Table 7.6
Table 7.6 Ridge boards Refers to Unstrutted
ridges in coupled roofs has having a depth not
less than length of Rafter
Plumb-Cut x 19mm thick
Calculate Rafter Plumb-Cut Length - 0.140
0.162 (Therefore 170 x 19 Ridge) cos 30
57
6. Obtain information for Hip Rafter (Hip)
Member Rule/Table Size Comments
Hip Rafter R R T
7.2.13
7.3.17
)
Check section 7 (Roof Framing) for information
rules tables for Hip Rafters
Note Find rules relating to Hip rafters
Page 87, Rule 7.2.13 Hip Valley Rafters
58
6. Obtain information for Hip Rafter (Hip)
Member Rule/Table Size Comments
Hip Rafter R R T
7.2.13
7.3.17
7.6 (Page 110)
Check section 7 (Roof Framing) for information
rules tables for Hip Rafters
Note Find rules relating to Hip rafters
Page 87, Rule 7.2.13 Hip Valley Rafters
Page 109, Rule 7.3.17 - The size of
Miscellaneous roof members shall be
determined from Table 7.6
Table 7.6 - states that hips should be 50mm
greater In depth than rafters x 19 thick
(seasoned) for stress grades F11/ MGP15 min.
No less than rafter stress grade.
59
6. Obtain information for Hip Rafter (Hip)
Member Rule/Table Size Comments
Hip Rafter R R T
7.2.13
190 x 19
7.3.17
7.6 (Page 110)
Check section 7 (Roof Framing) for information
rules tables for Hip Rafters
Note Find rules relating to Hip rafters
Page 87, Rule 7.2.13 Hip Valley Rafters
Page 109, Rule 7.3.17 - The size of
Miscellaneous roof members shall be
determined from Table 7.6
Table 7.6 - states that hips should be 50mm
greater In depth than rafters x 19 thick
(seasoned) for stress grades F11/ MGP15 min.
No less than rafter stress grade.
Use 190 x 19 Hip Rafters (140 50 190)
60
7. Obtain information for Under purlins
Member Rule/Table Size Comments
Underpurlin R R T 140 x 70 Span Direct from Span Tables of Supplements. Max. Span
7.2.10
7.3.12
Check section 7 (Roof Framing) for information
rules tables for Underpurlins
Note Find rules relating to Underpurlins
Page 84, Rule 7.2.10 Underpurlins
61
7. Obtain information for Under purlins
Member Rule/Table Size Comments
Underpurlin R R T 140 x 70 Span Direct from Span Tables of Supplements. Max. Span
7.2.10
7.3.12
28
Check section 7 (Roof Framing) for information
rules tables for Underpurlins
Note Find rules relating to Underpurlins
Page 84, Rule 7.2.10 Underpurlins Page 104,
Rule 7.3.12 - Size of Underpurlins Span Table 28
of Supplements
Refer Table 28 Continuous Span - for allowable
span to Underpurlin (Rafter spacing
1200, RLW 2100 Roof Mass 10Kg/m2)
Determine allowable Max. Span for Underpurlin
size 140 x 70 from Table 28
62

• We must interpolate between a RLW of 1800 2700
• Continuous Span
• 2100 2700
• 5600 ?
  4600

63

• We must interpolate between a RLW of 1800 2700
• 2100 2700
• 5600 ?
  4600
• 300/900 x/1000

64

• We must interpolate between a RLW of 1800 2700
• 2100 2700
• ?
  4300
• 300/900 x/600
• X 333 ? 4567

65
7. Obtain information for Under purlins
Member Rule/Table Size Comments
Underpurlin R R T 140 x 70 Span Direct from Span Tables of Supplements. Max. Span
7.2.10
7.3.12
4.567m
28
Check section 7 (Roof Framing) for information
rules tables for Underpurlins
Note Find rules relating to Underpurlins
Page 84, Rule 7.2.10 Underpurlins Page 104,
Rule 7.3.12 - Size of Underpurlins Span Table 28
of Supplements
Refer Table 28 Continuous Span - for allowable
span to Underpurlin (Rafter spacing
1200, RLW 2100 Roof Mass 10Kg/m2)
Determine allowable Max. Span for Underpurlin
size 140 x 70 from Table 28
66
8. Obtain information for Struts (Roof Strutting)
Member Rule/Table Size Comments
Struts R R T or Straight Strut Length Fan Strut Length
7.2.15
7.2.15.3
Check section 7 (Roof Framing) for information
rules tables for Struts
Note Find rules relating to Struts
Page 87, Rule 7.2.15 Roof Strutting Page
90, Rule 7.2.15.3 Fan Struts.
From Prelim. Calcs. Fill in lengths for straight
fan struts.
67
8. Obtain information for Struts (Roof Strutting)
Member Rule/Table Size Comments
Struts R R T or Straight Strut Length Fan Strut Length
7.2.15
7.2.15.3
7.6
Check section 7 (Roof Framing) for information
rules tables for Struts
Note Find rules relating to Struts
Page 87, Rule 7.2.15 Roof Strutting Page
90, Rule 7.2.15.3 Fan Struts. Page 109, Rule
7.3.17 - The size of Miscellaneous roof
members shall be determined from Table
7.6
From Prelim. Calcs. Fill in lengths for straight
fan struts.
Using Table 7.6 Determine section size of Struts
(Sheet Roof)
68
8. Obtain information for Struts (Roof Strutting)
Member Rule/Table Size Comments
Struts R R T or Straight Strut Length Fan Strut Length
1.211m
7.2.15
7.2.15.3
1.713m
7.6
Check section 7 (Roof Framing) for information
rules tables for Struts
Note Find rules relating to Struts
Page 87, Rule 7.2.15 Roof Strutting Page
90, Rule 7.2.15.3 Fan Struts. Page 109, Rule
7.3.17 - The size of Miscellaneous roof
members shall be determined from Table
7.6
From Prelim. Calcs. Fill in lengths for straight
fan struts.
Using Table 7.6 Determine section size of Struts
(Sheet Roof)
69
8. Obtain information for Struts (Roof Strutting)
Member Rule/Table Size Comments
Struts R R T Straight Strut Length Fan Strut Length
1.211m
90 x 45 2/90x45
7.2.15
7.2.15.3
1.713m
7.6
Check section 7 (Roof Framing) for information
rules tables for Struts
Note Find rules relating to Struts
Page 87, Rule 7.2.15 Roof Strutting Page
90, Rule 7.2.15.3 Fan Struts. Page 109, Rule
7.3.17 - The size of Miscellaneous roof
members shall be determined from Table
7.6
From Prelim. Calcs. Fill in lengths for straight
fan struts.
Using Table 7.6 Determine section size of Struts
(Sheet Roof)
70
9. Obtain information for Strutting Beams
Member Rule/Table Size Comments
Strutting Beams Supporting roof Ceiling Loads. Use Hyspan LVL Location Span Spacing Living/Dining Living/Family

• Use Hyspan LVL Span Tables for Residential
  Building

• Calculate spans for strutting beams from floor
  plan

71
Floor Plan Class Exercise 1
Beam to Living/Dining span 3.690
Beam to Living/Family span 3.500
72
8. Obtain information for Strutting Beams
Member Rule/Table Size Comments
Strutting Beams Supporting roof Ceiling Loads. Use Hyspan LVL Location Span Spacing Living/Dining Living/Family
Centre Off Centre 3.690 / 2.740
3.690
3.500

• Use Hyspan LVL Span Tables for Residential
  Building

• Calculate spans for strutting beams from floor
  plan

• Fill in span information

• Spacing as per plan

• Determine table numbers from Hyspan LVL tables
  to select beam section sizes

73
Use table 17 for Beam To Living/Dining - Span
3.690
Supporting Underpurlins Ceiling Joists
Go to Table 17 for member size
74
RLW 2.100
Span 3.690
Beam Size 170 x 63
75
8. Obtain information for Strutting Beams
Member Rule/Table Size Comments
Strutting Beams Supporting roof Ceiling Loads. Use Hyspan LVL Location Span Spacing Living/Dining Living/Family
Centre Off Centre 3.690 / 2.740
3.690
T 17
170 x 63
3.500

• Use Hyspan LVL Span Tables for Residential
  Building

• Calculate spans for strutting beams from floor
  plan

• Fill in span information

• Spacing is centre of rooms

• Determine table numbers from Hyspan LVL tables
  to select beam section sizes

• Fill in Data for Living/Dining Beam

76
Use table 18 for Beam To Living/Family - Span
3.500
Supporting Underpurlins Hanging Beams
Go to Table 18 for member size
77
RLW 3.215
Span 3.500
Beam Size 2/170x36
78
8. Obtain information for Strutting Beams
Member Rule/Table Size Comments
Strutting Beams Supporting roof Ceiling Loads. Use Hyspan LVL Location Span Spacing Living/Dining Living/Family
Centre Off Centre 3.215
3.690
T 17
170 x 63
T 18
2/170x36
3.500

• Use Hyspan LVL Span Tables for Residential
  Building

• Calculate spans for strutting beams from floor
  plan

• Fill in span information

• Spacing is centre of rooms

• Determine table numbers from Hyspan LVL tables
  to select beam section sizes

• Fill in Data for Living/Dining Beam

• Fill in Data for Living/Family Beam

79
Part A can now be completed.
On the plan supplied clearly mark all Hanging
Beams, Underpurlins and any Strutting Beams /
or Special Strutting Beams supporting Roof and
Ceiling loads.
80
x
x
x
x
x
x
x
x
Hyspan Strutting Beams
Hanging Beams
Under Purlins
Strutting
81
Class Exercise 1 Now Complete