BCGCA3005B

1. BCGCA3005B Construct Ceiling Frames

2. Intoduction

3. 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

6. 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

7. Ceiling Joists Provide Lateral Tie between opposing Rafters Portal Frame Design Walls Require Alternate Bracing Butressing Typical Residential Design (Coupled Roof)

8. Definition – Coupled Roof

9. Non Coupled Roof

10. Installation of Ceiling Joists Tops of Ceiling Joist may be trimmed so as not to protrude

11. 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

12. Ceilings Provide Diaphragm Bracing

13. Ceiling are an Important Structure • Support For Ceiling Linings • Tie bases of Rafters (Stop Spreading) • Straighten Walls (Between Intersecting Walls) • Diaphragm Bracing (9000mm Max)

14. 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

15. Excercise • Complete Question 6

16. Selecting Members 10mm Plasterboard Direct Fix Single Span Ceiling Joist A x = 2000mm F5 @ 450 c to c What size Ceiling Joist is Required ?

17. 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

18. 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?

19. Next Largest span after 2700mm Check for Required Grade ! 450 c to c

20. 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

21. Next Largest span after 2700mm 450 c to c Continuous Span Check For Required Grade !

22. 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

23. 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

24. Why Continuous Spans

25. Continuous Span

26. 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.

27. 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

28. Excercise • Complete Questions 4 & 5 in the Worksheet

31. What items determine the sizing of Ceiling Joists? Refer to Span Tables Complete Questions 7 & 7.1 of Workbook

32. Hanging Beams- also referred to as Hangers Hanging Beams provide support to Ceiling Joists where walls are available

33. Connecting Hanging Beams to Ceiling Joists Ceiling Dog

34. Connecting Hanging Beams to Ceiling Joists Unitie 4 Timber Connector Nails in Each Member

35. Connecting Hanging Beams to Ceiling Joists Triple Grips 4 @ 35mm x 3.15 Connector Nails in to each member

36. 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

37. Isometric View Complete Exercise 8 of the Work Book

38. Restraining Deep Hanging Beams What is a Deep Beam ? Where depth is Greater than 7 times the Width

39. 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”

40. Binders refer AS 1684.2 cl 6.2.5.1 At Gable Ends walls do not have Ceiling Joists to Brace them

41. Work Book Complete Question 9

42. Selecting Member SizesHanging BeamRefer Question 10 Ceiling Joist Span = 3600mm Hanging Span = 4500mm

43. What is Ceiling Load Width ? Check Notes

44. Without Hanging Beam all Load is transferred to walls Hanging Beam is similar to having a wall in same location

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

46. Complete Workbook Q10

47. 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

48. Intersection of Hanging & Counter Note – Counter Beam is Supporting Hanging Beam

49. Intersection of Hanging & Counter

50. Intersection of Hanging & Counter Hanging Beam Counter Beam Packer to Provide Clearance to Ceiling Complete Q11 & 11.1 in Workbook