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Conventional Roof Framing Class Exercise 2 - 18 0 Residential Studies Certificate IV 2182D. 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. .

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slide1

Conventional Roof Framing

Class Exercise 2 - 180

Residential Studies Certificate IV

2182D

slide2

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.

slide3

Floor Plan Class Exercise 2

Note: Hyspan LVL Strutting Beams to Dining / Lounge & Bedroom 1 as shown

slide4

Preliminary Calculations

Common Rafter

True Length of Common Rafter Pitch 180

Half Span = 8.150 – 0.300

2

= 3.925m

Rise = Tan 180 x 3.925

= 1.275m

TLCR = 4.127

Rise 1.275

TLCR = 3.925

Cos 180

= 4.127m

180

Half Span 3.925

slide5

Calculate Common Rafter Span & RLW of Underpurlin

2.064

4.127

2.064

RLW = 4.127

2

= 2.064m

Span of Rafter = 2.064m Say 2.100m

RLW of Underpurlin = 2.064m Say 2.100m

slide6

Calculate Eaves Overhang – Eaves RLW

0.788m

TL O/Hang = 0.600 + 0.150

COS 180

= 0.788m

RLW Eaves = 0.788m

0.150

0.600

slide7

Calculate Fan Strut Lengths & Distance X.

Strut = ?

2.064

2.064

Strut = Tan180 x 2.064

= 0.671

2.064

Strut

0.788

0.671

Dist. X = 1.862

run of rafter = 3.925

100mm

width

Distance X = Run of rafter divided by 2 less 100mm plate width: 3.925/2 = 1.962 – 100 = 1862

slide8

Calculate Fan Strut Length

0.671

0.671

Fan Strut =  0.6712 + 0.6712

= 0.949m

or

= 0.671

cos 450

= 0.949m

0.671

0.949

0.949

Half Spread Fan Strut = 0.671m

Fan Strut Length = 0.949m

slide9

Summary:

Rafter Span = 2.064 Say 2.100

RLW Underpurlin = 2.064 Say 2.100

Overhang eaves = 0.788

Purlin horizontal Set Out, “Distance X” = 1.862

Half Spread Fan Strut = .671

Full spread Fan Strut = 1.342

Fan Strut Length = 0.949

slide10

Using the information from the Preliminary Calculations

&

The Job Specification

Fill in the Project job sheets to arrive at final design requirements.

slide11

General Information from Project Details

Seasoned S/Wood

MGP 15

6 – N3

60Kg/m2

Conventional

2.700

0.600

Fill in comments column with information from project specification

slide12

Using A.S. 1684.2 (2006) – Section 7 Roof Framing

1. Obtain information for Ceiling Joists to complete job sheet.

2.400

7.2.4

21

2.800

7.3.6

  • 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

slide13

2. Obtain information for Hanging Beams

7.2.5

2 / 90 x 45

2.475 1.720

2.930 2.050

23

120 x 45

2.730 2.050

120 x 35

2.540 1.225

90 x 45

7.3.7

1.680 1.725

90 x 35

140 x 45

3.770 1.720

2 / 170 x 35

3.770 2.055

170 x 35

3.830 2.055

170 x 35

3.830 2.055

140 x 45

3.300 2.775

N / A

  • 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

slide14

3. Obtain information for Rafters

7.2.11

0.600

120 x 35

29

2.100

7.3.13

0.788

Fill in comments column with information from project specification & Prelim. Calcs.

  • 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)
slide15

4. Obtain information for Collar Ties

3.805

7.2.16 &

7.3.17

70 x 35

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: 7.610 / 2 = 3.805

From Table 7.6 – Ties to 4200mm long for F8/MGP12 or higher stress grade – 70 x 35

slide16

5. Obtain information for Ridge board

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

slide17

Ridge

Refer Table 7.6 (AS 1684.2) page 110,

Ridge depth = rafter plumb cut x 19mm thick.

Therefore use 140 x 19 MGP 15 S/wood.

0.126

Rafter 120 x 35 MGP 15

Seasoned Softwood

Length of Plumb Cut

Length of Plumb cut = Rafter Depth

Cos. Roof Pitch

= 0.120

Cos. 180

= 0.126

0.120

slide18

5. Obtain information for Ridge board

7.2.12

140 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 - 0.120 = 0.126 (Therefore 140 x 19 Ridge)

cos 180

slide19

6. Obtain information for Hip Rafter (Hip)

Note: Plan shows Roof is a Gable Roof – Therefore NO HIPS REQUIRED

slide20

7. Obtain information for Under purlins

7.2.10

7.3.12

3.633m

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 = 0.600, RLW = 2100 & Roof Mass = 60Kg/m2)

Interpolate allowable Max. Span for Underpurlin size 140 x 70 from Table 28

slide21

8. Obtain information for Struts (Roof Strutting)

90 x 45

70 x 70

0.671m

7.2.15

7.2.15.3

0.949m

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 – (Tile Roof)

slide22

9. Obtain information for Strutting Beams

  • Use Hyspan LVL Span Tables for Residential Building
  • Calculate spans for strutting beams from floor plan
slide23

Beam to Lounge / Dining, Span = 4.110

Beam to Bedroom 1, Span = 3.440

slide24

8. Obtain information for Strutting Beams

Centre

Centre

4.110

3.440

  • 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 number from Hyspan LVL tables to select beam section sizes
slide25

Use table 18 for Beam

To Lounge/Dining -

Span = 4.110

&

Beam to Bedroom 1 -

Span = 3.440

Supporting Underpurlins

& Hanging Beams

Go to Table 18

for member size

slide26

TILE ROOF AND CEILING

Maximum Span (M)

RLW = 2.475 B1

= 3.830 L/D

Lounge/ Dining

Beam Span = 4.110

Lounge/ Dining

Beam = 300x75

Bedroom 1

Beam Span = 3.440

Bedroom 1

Beam = 2/200 x 45

slide27

8. Obtain information for Strutting Beams

Centre

Centre

4.110

300 x 75

T 18

2/ 200 x 45

3.440

  • 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 Lounge/Dining Beam
  • Fill in Data for Bedroom 1 Beam
slide28

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.

slide29

Single struts

Strutting Beams

Under Purlins

Fan struts

Hanging Beams