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