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BCGCA3005B. Construct Ceiling Frames. Intoduction. Ceiling Frame is the structure between the top of walls and the roof Enclose the Room Frame Consists of Ceiling Joists, Ceiling Trimmers, Hangers, Hanging Beams Used in Skillion, Gable, Hip Roof. Ceiling Joists.

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bcgca3005b

BCGCA3005B

Construct Ceiling Frames

slide3

Ceiling Frame is the structure between the top of walls and the roof

  • Enclose the Room
  • Frame Consists of Ceiling Joists, Ceiling Trimmers, Hangers, Hanging Beams
  • Used in Skillion, Gable, Hip Roof
slide6

Ceiling Joists

  • Horizontal Members with ends rested on top wall plate
  • Generally spaced at 450mm or 600mm
  • Initially ceiling material will determine spacing
  • Sizes and Grading are determined from Span Tables Ceiling Lining may be nailed directly to Joists
slide7

Ceiling Joists

Provide Lateral Tie between opposing Rafters

Portal Frame Design

Walls Require Alternate Bracing

Butressing

Typical Residential Design

(Coupled Roof)

slide10

Installation of Ceiling Joists

Tops of Ceiling Joist may be trimmed so as not to protrude

slide11

AS 1684.2 Ceiling Joists

  • Ceiling Joists shall be spaced to support ceiling linings
  • For Coupled Roofs
  • Ceiling Joists run in same direction as rafters
  • Be in single lengths or spliced
  • Same spacing as Rafters
ceiling are an important structure
Ceiling are an Important Structure
  • Support For Ceiling Linings
  • Tie bases of Rafters (Stop Spreading)
  • Straighten Walls (Between Intersecting Walls)
  • Diaphragm Bracing (9000mm Max)
joining ceiling joists
Joining Ceiling Joists
  • Be only made at points of support
  • Lapped over support 3 times depth- 6 hand driven nails 75mm x 3.8- 8 machine driven nails 75mm x 3.08- or 1 M12 Bolt
  • Butt joined - fish plates to each side- minimum length - 6 x depth of joist- 19mm x Depth of Ceiling Joist
  • Nailing plates as per manufacturers detail
excercise
Excercise
  • Complete Question 6
selecting members
Selecting Members

10mm Plasterboard Direct Fix

Single Span

Ceiling Joist A

x = 2000mm

F5 @ 450 c to c

What size Ceiling Joist is Required ?

slide17

Refer p99 AS1684.2

Remember First Check the NOTES!

Check Grade !

From Appendix B

10mm Plaster Board = 7.5kg/sqm

Therefore OK

What are Ceiling Masses ?

Refer Appendix B – AS 1684.2

450 Centres

Next Highest Span above Required 2000mm Span

selecting members18
Selecting Members

Single Span

Ceiling Joist A

x = 2000mm

F5 @ 450 c to c

120mm x 35mm

Single Span

Ceiling Joist B

x = 2700mm

F7 @ 450 c to c.

What Size Ceiling

Joists are required?

slide19

Next Largest span after 2700mm

Check for Required Grade !

450 c to c

selecting members20
Selecting Members

Continuous Spans

10mm Plasterboard Direct Fix

Single Span

Ceiling Joist B

x = 2500mm

F7 @ 450 c to c

120mm x 45mm

Ceiling Joist A & B – AS 1684 requires joists to be Continuous

x + y = 4500mm

F5 @ 450 c to c

Note – Maximum Span is 2700mm, 4700mm is irrelevant

slide21

Next Largest span after 2700mm

450 c to c Continuous Span

Check For Required Grade !

compare single to continuous
Compare Single to Continuous

120 x 45 F7

120 x 35 F5

10mm Plasterboard Direct Fix

Ceiling Joist A & B as Continuous Joist

450 c to c,

10mm Plasterboard

120 x 35 F5 is Sufficient

exercise
Exercise
  • Complete Question 5 on Workbook

Using MGP 10 select suitable Ceiling Joints

Joist X =

Joist Y =

Using MGP 10 select suitable Ceiling Joints for continuous span

Max Span Required

Ceiling Joist size =

120 x 35

140 x 35

3500

120 x 35

framing openings in ceilings
Framing Openings in Ceilings
  • AS 1684.2 cl 7.2.4.4
  • Openings up to 1000mm – same size as ceiling
  • 1000mm up to 3000mm – width increased (accumulatively) by 20% for every 300mm of opening or part there of.
slide27

Ceiling Openings Example

Ceiling Joists 90 x 45 MGP 10 Radiata Pine

1800 Square Opening

1800 – 1000 = 800 (1000mm being maximum allowable to use same members)

800mm divided by 300mm = 2.667 therefore 3 increments

45mm x 1.2 = 54mm 1st Increase by 20%

54mm x 1.2 = 65mm 2nd Increase by 20%

65mm x 1.2 = 78mm 3rd Increase by 20%

Therefore minimum size is 90mm x 78mm

excercise28
Excercise
  • Complete Questions 4 & 5 in the Worksheet
slide31

What items determine the sizing of Ceiling Joists?

Refer to Span Tables

Complete Questions 7 & 7.1 of Workbook

slide32

Hanging Beams- also referred to as Hangers

Hanging Beams provide support to Ceiling Joists where walls are available

slide34

Connecting Hanging Beams to Ceiling Joists

Unitie

4 Timber Connector Nails in Each Member

slide35

Connecting Hanging Beams to Ceiling Joists

Triple Grips

4 @ 35mm x 3.15 Connector Nails in to each member

slide36

End Support of Hanging Beams

Hanging Beams shall be nailed or bolted to a rafter

Beam Shall Bear Full Width of Plate on Packing

Where more than 2/3 of the Beam needs to be trimmed a ceiling trimmer is required

isometric view
Isometric View

Complete Exercise 8 of the Work Book

restraining deep hanging beams
Restraining Deep Hanging Beams

What is a Deep Beam ?

Where depth is Greater than 7 times the Width

hanging beams
Hanging Beams

Gable Ends

Packing Full Width of Plate. Build up to top of Ceiling Joists

Where Beam is longer than 3000mm stud required directly below

Where this occurs at Gable Ends , no ceiling joists to brace end wall

The Beam will also act as a “Binder”

binders refer as 1684 2 cl 6 2 5 1
Binders refer AS 1684.2 cl 6.2.5.1

At Gable Ends walls do not have Ceiling Joists to Brace them

work book
Work Book

Complete Question 9

selecting member sizes hanging beam refer question 10
Selecting Member SizesHanging BeamRefer Question 10

Ceiling Joist Span = 3600mm

Hanging Span = 4500mm

slide44

Without Hanging Beam all Load is transferred to walls

Hanging Beam is similar to having a wall in same location

slide45

Required Beam

190 x 45 MGP 10

What is Ceiling Load Width ?

1800mm

What is the Hanging Beam Span ?

4500mm

counter beams called hanging beams in the tafe guide
Counter Beamscalled Hanging Beams in the TAFE GUIDE

Reduce Span of Hanging Beam

At 90º to Hanging Beams

Supported on Walls

With stud directly below if longer than 3000mm

Trimmed for Roof Finishes

Similar to Hanging Beams

intersection of hanging counter
Intersection of Hanging & Counter

Note – Counter Beam is Supporting Hanging Beam

intersection of hanging counter50
Intersection of Hanging & Counter

Hanging Beam

Counter Beam

Packer to Provide

Clearance to Ceiling

Complete Q11 & 11.1 in Workbook

slide51

Counter Beams

Reduces Span of Hanging Beam

Without Counter Beam, Hanging Span is x

Load Flow

x/2

Once Counter Beam is installed, Hanging Beam Span is now x/2

x/2

Load Flow

selecting member
Selecting Member

Counter Beam Span = 3600mm

Hanging Beam Length (x) = 6000mm

slide53

Counter Beam Spacing = x/2

There may be more than 1

X= 8000mm

Beam Span 4000mm

Check Grade

Check Notes

slide54

Determine Suitable Counter Beam

Complete Questions 11 & 12

F8

MGP 12

F14

F27

190 x 45

170 x 35

175 x 40

140 x 45 or 2/120 x 35

Counter beam span 3600

Hanging Beam Length (x) 6000

combined strutting hanging beams
Combined Strutting/Hanging Beams

Reduce Span of Ceiling Joists and Purlin

Supported on Walls

With stud directly below if longer than 3000mm

Roof Load Strutted down to Hanging Beam

slide57

Check Grade

First we need to determine what ceiling load it carrying?

Roof Masses

Check Notes

ceiling load width clw
Ceiling Load Width (CLW)

Sheet Roof

Ceiling Joist Span (x) = 4200

Hanging Beam Span = 6000

Rafter Span (B) = 4500

Therefore CLW = 2100

Remember what we are trying

Work out is what load is the

member carrying

roof area support
Roof Area Support

Sheet Roof

Why A ?

Strut Down to Beam from Purlin(Roof)

Struts down to top plate distance between these 2 struts is A

Therefore strut takes load ½ way between other supports

5000/2 = A

A = 2500

Ceiling Joist Span (x) = 4200

Hanging Beam Span (A) = 5000

Rafter Span (B) = 4500

slide61

Roof Area Support

Why B?

Rafter is supported by Purlin

Rafter Load is Transferred thru

Purlin Strut

Ridge Strut,

Top Plate

Therefore Beam takes load ½ way between supports (4500/2)

= 2250

Ceiling Joist Span (x) = 4200

Hanging Beam Span (A) = 5000

Rafter Span (B) = 4500

slide62

Remember Ceiling Load Width = 2100

Next we need to calculate what roof load it is carrying?

2.250 (Rafter Span) x

2.500 ( HB Span)

=5.625

Required Hanging Beam Span = 5000

Required Hanging Beam Span = 5000mm

combined strutting counter beams
Combined Strutting/Counter Beams

Reduce Span of Hanging Beam

Supported on Walls

With stud directly below if longer than 3000mm

Roof Load Strutted down to Hanging Beam

strutting beam
Strutting Beam

No Ceiling Support

Load Flow

alternate ceilings p288
Alternate Ceilings P288

Flat Roof Construction

estimating
Estimating

Determine No of Ceiling Joists

= Length – 2 x Plate Width – 1 x Ceiling Joist Thickness

estimating75
Estimating

Determine No of Ceiling Joists (CJ 90 x 45)

= 12500– 180 – 45

= 12275

estimating76
Estimating

Determine No of Ceiling Joists

12275 ÷ 600 = 20.458

= 21 + 1

= 22 @6900

estimating77
Estimating

Determine Even Spacing

12275 ÷ 21 = 584.524

estimating78
Estimating

Determine Joist Layout

estimating79
Estimating

Bay 1

Bay 1 = Joist 1 to Joist 9 = 9

Determine No of Ceiling Joists

By Bay

estimating80
Estimating

Bay 1

Bay 2

Bay 1 = Joist 1 to Joist 9 = 9

Bay 2 = Joist 10 to 17 = 7

Determine No of Ceiling Joists

By Bay

estimating81
Estimating

Bay 1

Bay 3

Bay 2

Bay 1 = Joist 1 to Joist 9 = 9

Bay 2 = Joist 10 to 17 = 7

Bay 3 = Joist 18 to 22 = 5

Determine No of Ceiling Joists

By Bay

slide82

Place Hanging & Counter Beams

Single Span greater than 2000mm

ceiling trimmers
Ceiling Trimmers

6650 ÷ 600 = 11.083 = 12

+ 1 to Close = 13

+ 1 for intersection =14

ceiling trimmers86
Ceiling Trimmers

6650 ÷ 600 = 11.083 = 12

+ 1 to Close = 13

+ 1 for intersection =14

3350 ÷ 600 = 5.6 = 6

+ 1 to Close = 7

ceiling trimmers87
Ceiling Trimmers

6650 ÷ 600 = 11.083 = 12

+ 1 to Close = 13

+ 1 for intersection =14

800 ÷ 600 = 1.3 = 2

+ 1 to Close = 3

3350 ÷ 600 = 5.6 = 6

+ 1 to Close = 7

ceiling trimmers88
Ceiling Trimmers

Answer

23 @ 0.600 = 13.800

Note as blocks no need to specify length

6650 ÷ 600 = 11.083 = 12

+ 1 to Close = 13

+ 1 for intersection =14

800 ÷ 600 = 1.3 = 2

+ 1 to Close = 3

3350 ÷ 600 = 5.6 = 6

+ 1 to Close = 7

determine hanging beams
Determine Hanging Beams

3 @ 5450

2 @ 2850

1 @ 3850

1 @ 3300

1 @ 4400

slide92

Counter Beam

1 @ 3.400

slide94

Ceiling Dogs

Every Time a joist crosses a beam

One at every Hanging Beam

Two at Ceiling Joist Joints