The document discusses flashings for roof and wall penetrations. It describes different types of flashings including custom made flashings made of materials like steel, zinc, lead, copper, aluminum or stainless steel. Prefabricated flashings are also discussed. The document outlines the process for installing flashings which includes establishing the type of penetration, material to be used, conducting inspections, checking plans and structures, using proper safety equipment and tools, and ensuring the installation is water tight. Key steps like supporting openings, joining materials, and using sealants are also covered. Assessment tasks with diagrams are provided at the end to test understanding.

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
258 1/3

3. Types of flashings
Custom made
Prefabricated
258 2/3

4. Custom made flashings
Steel – Gal Zinc aluminium covered
Sheet zinc
Sheet lead
Sheet copper
Sheet aluminium
Stainless steel sheet
Neoprene
258 3/3

5. Prefabricated flashings
steel – Gal Zinc aluminium covered
zinc
lead
copper
aluminium
Stainless steel
Neoprene
259 1/1

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
260 1/1

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

8. Establishing material type
Concealed fixings
Pierced fixed roof
261 2/2

9. Conduct site inspection
Is the penetration clear of !!!!!!!!
Electrical wiring
Building services
Other pipe work
Roof supports
262 1/4

10. Building plans
You need to be able to !!!!!
Read a Job Plan
Estimate job requirements
Under stand your task
262 2/4

11. Check for structural alteration
Safety mesh
Need to be reinforced
Check the structure
Insulation
262 3/4

12. Quality assurance
Procedures
Materials
Handling
Maintenance
specifications
262 4/4

13. Safety PPE
Overalls Gloves
Boots Sun screen
Safety glasses Hard hat
Ear plugs
Dust mask
263 1/1

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

15. Tools and equipment
Scaffolding Signage
E,W,P Electrical leads
Ladders
Hand tools
Power tools
264 1/1

16. Make the work site safe
Water lines- Flooding
Gas Lines- fire hazard
Electrical- electrocution
Cutting members- structure weakness
265 1/2

17. Worksheet questions
Answer question one and
two on your work sheet
James Langston
265 2/2

18. Determine flashing requirements
266 1/2

19. Penetration between ribs
Must have an up
stand with a base
plate
Be sealed to roof
surface
266 2/2

20. Tapered skirt
Sealed around
penetration
Overlap up stand by
no lass then 50mm
267 1/2

21. Synthetic rubber flashing
Install to manufactures specifications
267 2/2

22. Penetrating the rib
Rib to be sealed to
avoid rain water
entering
268 1/3

23. Flashing large penetrations
268 2/3

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

25. Capillary action
Is water being drawn between two
touching surfaces
269 1/2

26. Quantities @ Materials
Matching existing materials
Right size
Avoid contact between dissimilar metals
Draining from upper to lower roof must
correct materials
269 2/2

27. Quantities @ quality
Right sheets
Right length
Right fasteners
Right sealant
Correct size flashings
Materials compatible
270 1/1

28. Carry out the job
Adequate drainage
Roof supports
Supports for flashing
OH&S
Swarf removal
Water tight ribs
Anti-capillary cuts
271 1/1

29. Roof structure support timbers
Support the opening with timber
272 1/2

30. Worksheet questions
Answer question five
on your work sheet

31. Ribs
272 1/2

32. Ribs
273 2/2

33. Stop ends in trays
Full height of rib
Turn up to 75 Deg
274 1/2

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
274 2/2

35. Ensuring joints are
flush
Avoid the build up of
undrained water on
roof
275 1/4

36. Ensuring joints are
lapped in the
direction of the outlet
275 2/4

37. Ensuring joints are secure
Allowances for
Wind pressure
Thermal movement
Water tightness
275 3/4

38. Preparation of opening
Compatible material
Large enough to drain the water
Annular space
275 4/4

39. Installing structural supports
Install supports
when roof has
been weakened
by sheet or
structure cutting
276 1/2
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
277 1/2

41. Soldering
Not common these days because
Other methods available
Material type
277 2/2

42. Sealants
Commonly used
Containing silicone rubber
Many colours
Suitable for roofing
278 1/2

43. Worksheet questions
Answer question seven on
your work sheet

44. Benefits of silicone
Stick to most material
Sealant flexible
Last at least 30 years
278 2/2

45. Take care using silicone
•Surface free of grease •Joints to be fixed
•Read instructions •25mm wide seal
•Surface must be clean joint
•Can clean with non-carcinogen •Seal to cover
solvent fixings
279 1/2

46. Jointing procedure
Assemble Place sealant
Drill Reassemble joint
Remove burs Seal rivets or screws
clean Clean off extra
silicone
279 2/2

47. Questions and answers
Answer question eight in the
work book
280 1/1

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

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

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

51. Assessment task
Task 4
All minimum laps, overlaps and expansion
allowances and other relevant dimensions must
comply with SAA HB39 1997
300mmx300mm