1. Flash penetrations through roofs and walls.
James Langston south west TAFE

2. Introduction What are flashings What is a penetration
Why do we need them /3

3. Types of flashings
Custom made
Prefabricated /3

4. Custom made flashings Steel – Gal Zinc aluminium covered Sheet zinc
Sheet lead
Sheet copper
Sheet aluminium
Stainless steel sheet
Neoprene /3

5. Prefabricated flashings
steel – Gal Zinc aluminium covered
zinc
lead
copper
aluminium
Stainless steel
Neoprene /1

6. Plan work activities Establish what will be penetrated
Establish the type of material to be used
Conduct a site inspection
Get specs for job
Check for structural alterations
James Langston south west TAFE /1

7. Type of Penetration
pipe
Sky Light
Duct
flue
Roof structure
261 1/2

8. Establishing material type
Concealed fixings
Pierced fixed roof /2

9. Conduct site inspection
Is the penetration clear of !!!!!!!!
Electrical wiring
Building services
Other pipe work
Roof supports /4

10. Building plans You need to be able to !!!!! Read a Job Plan
Estimate job requirements
Under stand your task /4

11. Check for structural alteration
Safety mesh
Need to be reinforced
Check the structure
Insulation /4

12. Quality assurance Procedures Materials Handling Maintenance
specifications /4

13. Safety PPE Overalls Boots Safety glasses Ear plugs Dust mask Gloves
Sun screen
Hard hat /1

14. How did that get in there
James Langston's wife

15. Tools and equipment Scaffolding E,W,P Ladders Hand tools Power tools
Signage
Electrical leads /1

16. Make the work site safe Water lines- Flooding Gas Lines- fire hazard
Electrical electrocution
Cutting members- structure weakness /2

17. Worksheet questions Answer question one and two on your work sheet
James Langston /2

18. Determine flashing requirements/2

19. Penetration between ribs
Must have an up stand with a base plate
Be sealed to roof surface /2

20. Tapered skirt Sealed around penetration
Overlap up stand by no lass then 50mm /2

21. Synthetic rubber flashing
Install to manufactures specifications /2

22. Penetrating the rib Rib to be sealed to avoid rain water entering/3

23. Flashing large penetrations/3

24. Answer question three and four on your work sheet
Worksheet questions
Answer question three and four on your work sheet
James Langston

25. Capillary action Is water being drawn between two touching surfaces/2

26. Quantities @ Materials
Matching existing materials
Right size
Avoid contact between dissimilar metals
Draining from upper to lower roof must correct materials /2

27. Quantities @ quality Right sheets Right length Right fasteners
Right sealant
Correct size flashings
Materials compatible /1

28. Carry out the job Adequate drainage Roof supports
Supports for flashing
OH&S
Swarf removal
Water tight ribs
Anti-capillary cuts /1

29. Roof structure support timbers
Support the opening with timber /2

30. Worksheet questions
Answer question five on your work sheet

31. Ribs /2

32. Ribs /2

33. Stop ends in trays
Full height of rib
Turn up to 75 Deg /2

34. Cutting the surface Ensuring joints are flush
Joints Lapped the right way
Joints secure
Keep power leads away from sharps
Do not use carborundum cutting disks /2

35. Ensuring joints are flush
Avoid the build up of undrained water on roof /4

36. Ensuring joints are lapped in the direction of the outlet/4

37. Ensuring joints are secure
Allowances for
Wind pressure
Thermal movement
Water tightness /4

38. Preparation of opening
Compatible material
Large enough to drain the water
Annular space /4

39. Installing structural supports
Install supports when roof has been weakened by sheet or structure cutting /2
James Langston

40. Flashing of large duct Dimension the opening Sheets are cut
Roof reinforced
Soaker made up and installed
Apron made and installed
Remove swarf /2

41. Soldering Not common these days because Other methods available
Material type /2

42. Sealants Commonly used Containing silicone rubber Many colours
Suitable for roofing /2

43. Answer question seven on your work sheet
Worksheet questions
Answer question seven on your work sheet

44. Benefits of silicone Stick to most material Sealant flexible
Last at least 30 years /2

45. Take care using silicone
Surface free of grease
Read instructions
Surface must be clean
Can clean with non-carcinogen solvent
Joints to be fixed
25mm wide seal joint
Seal to cover fixings /2

46. Jointing procedure Assemble Drill Remove burs clean Place sealant
Reassemble joint
Seal rivets or screws
Clean off extra silicone /2

47. Answer question eight in the work book
Questions and answers
Answer question eight in the work book /1

48. Assessment task
Task 1
150mm
75mm
425mm
300mm

49. Assessment task Task 2 corrugated wall cladding
Minimum
300mm x 350mm
Duct
Under flashing to be riveted and silicone sealed
at this point to prevent water running behind sheet

50. Assessment task
Task 3
300mm
75mm
Measurement to suit job
450mm

51. Assessment task
Task 4
All minimum laps, overlaps and expansion allowances and other relevant dimensions must comply with SAA HB
300mmx300mm