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**Construct Ceiling Frames**

BCGCA3005B Construct Ceiling Frames

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Intoduction

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**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

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**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

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**Ceiling Joists Provide Lateral Tie between opposing Rafters**

Portal Frame Design Walls Require Alternate Bracing Butressing Typical Residential Design (Coupled Roof)

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**Definition – Coupled Roof**

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Non Coupled Roof

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**Installation of Ceiling Joists**

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

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AS 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

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**Ceilings Provide Diaphragm Bracing**

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**Ceiling are an Important Structure**

Support For Ceiling Linings Tie bases of Rafters (Stop Spreading) Straighten Walls (Between Intersecting Walls) Diaphragm Bracing (9000mm Max)

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**Joining Ceiling Joists**

Be only made at points of support Lapped over support 3 times depth - 6 hand driven nails 75mm x machine driven nails 75mm x or 1 M12 Bolt Butt joined - fish plates to each side - minimum 6 x depth of joist - 19mm x Depth of Ceiling Joist Nailing plates as per manufacturers detail

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Excercise Complete Question 6

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**Selecting Members 10mm Plasterboard Direct Fix Single Span**

Ceiling Joist A x = 2000mm 450 c to c What size Ceiling Joist is Required ?

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**Remember First Check the NOTES! From Appendix B **

Refer p99 AS1684.2 Remember First Check the NOTES! From Appendix B 10mm Plaster Board = 7.5kg/sqm Therefore OK Check Grade ! What are Ceiling Masses ? Refer Appendix B – AS 450 Centres Next Highest Span above Required 2000mm Span

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**Selecting Members Single Span Ceiling Joist A x = 2000mm**

450 c to c 120mm x 35mm Single Span Ceiling Joist B x = 2700mm 450 c to c. What Size Ceiling Joists are required?

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**Next Largest span after 2700mm**

Check for Required Grade ! 450 c to c

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**Selecting Members Continuous Spans 10mm Plasterboard Direct Fix**

Single Span Ceiling Joist B x = 2500mm 450 c to c 120mm x 45mm Ceiling Joist A & B – AS 1684 requires joists to be Continuous x + y = 4500mm 450 c to c Note – Maximum Span is 2700mm, 4700mm is irrelevant

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**Next Largest span after 2700mm**

450 c to c Continuous Span Check For Required Grade !

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**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

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**Exercise Complete Question 5 on Workbook 120 x 35 140 x 35 3500**

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

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Why Continuous Spans

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Continuous Span

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**Framing Openings in Ceilings**

AS cl Openings up to 1000mm – same size as ceiling 1000mm up to 3000mm – width increased by 20% for every 300mm of opening

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**Ceiling Openings Example**

Ceiling Joists 90 x 45 MGP 10 Radiata Pine 1800 Square Opening 1800 – = 800 (1000mm being maximum allowable to use same members) 800mm divided by 300mm = 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

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Excercise Complete Questions 4 & 5 in the Worksheet

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**What items determine the sizing of Ceiling Joists?**

Refer to Span Tables Complete Questions 7 & 7.1 of Workbook

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**Hanging Beams- also referred to as Hangers**

Hanging Beams provide support to Ceiling Joists where walls are available

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**Connecting Hanging Beams to Ceiling Joists**

Ceiling Dog

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**Connecting Hanging Beams to Ceiling Joists**

Unitie 4 Timber Connector Nails in Each Member

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**Connecting Hanging Beams to Ceiling Joists**

Triple Grips 35mm x 3.15 Connector Nails in to each member

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**End Support of Hanging Beams**

Hanging Beams shall 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

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Isometric View Complete Exercise 8 of the Work Book

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**Restraining Deep Hanging Beams**

What is a Deep Beam ? Where depth is Greater than 7 times the Width

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**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”

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Binders refer AS cl At Gable Ends walls do not have Ceiling Joists to Brace them

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Work Book Complete Question 9

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**Selecting Member Sizes Hanging Beam Refer Question 10**

Ceiling Joist Span = 3600mm Hanging Span = 4500mm

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**What is Ceiling Load Width ?**

Check Notes

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**Without Hanging Beam all Load is transferred to walls**

Hanging Beam is similar to having a wall in same location

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Required Beam 190 x 45 MGP 10 What is Ceiling Load Width ? 1800mm What is the Hanging Beam Span ? 4500mm

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Complete Workbook Q10

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**Counter Beams called 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

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**Intersection of Hanging & Counter**

Note – Counter Beam is Supporting Hanging Beam

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**Intersection of Hanging & Counter**

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**Intersection of Hanging & Counter**

Hanging Beam Counter Beam Packer to Provide Clearance to Ceiling Complete Q11 & 11.1 in Workbook

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**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

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**Selecting Member Counter Beam Span = 3600mm**

Hanging Beam Length (x) = 6000mm

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**Counter Beam Spacing = x/2**

There may be more than 1 X= 8000mm Beam Span 4000mm Check Grade Check Notes

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**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

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**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

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Check Grade First we need to determine what ceiling load it carrying? Roof Masses Check Notes

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**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

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

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**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

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**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

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**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

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**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

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Strutting Beam No Ceiling Support Load Flow

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Complete Q13

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Alternate Ceilings P288 Flat Roof Construction

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**Exposed Grid Ceilings Page 289**

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Exposed Grid Ceiling

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**Concealed Fixed Suspended Ceiling Page 290**

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**Direct Fix Systems Page 290**

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**Estimating Determine No of Ceiling Joists 12 250/ 600 = 20.4167**

12 250/ 600 = = =

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**Place Hanging & Counter Beams**

Single Span greater than 200mm

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**Ceiling Trimmers 6650 ÷ 600 = 11.083 = 12 + 1 to Close = 13**

800 ÷ 600 = 1.3 = 2 + 1 to Close = 3 = 23 39 x = = 21.6 Say 6.0 = 18.0 3.6 = 3.6 6650 ÷ 600 = = 12 + 1 to Close = 13x2 = 26 3350 ÷ 600 = 5.6 = 6 + 1 to Close = 7

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**Determine Hanging Beams**

5450 2850 3850 3300 4400

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Counter Beam

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Ceiling Dogs Every Time a joist crosses a beam One at every Hanging Beam Two at Ceiling Joist Joints

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Planning

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Fractions Simplify: 36/48 = 36/48 = ¾ 125/225 = 125/225 = 25/45 = 5/9

Fractions Simplify: 36/48 = 36/48 = ¾ 125/225 = 125/225 = 25/45 = 5/9

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