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

Introduction What are flashings What is a penetration Why do we need them 258 1/3

Types of flashings Custom made Prefabricated 258 2/3

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

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

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

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

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

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

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

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

Quality assurance Procedures Materials Handling Maintenance specifications 262 4/4

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

How did that get in there James Langston's wife

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

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

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

Determine flashing requirements 266 1/2

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

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

Synthetic rubber flashing Install to manufactures specifications 267 2/2

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

Flashing large penetrations 268 2/3

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

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

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

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

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

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

Worksheet questions Answer question five on your work sheet

Ribs 272 1/2

Ribs 273 2/2

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

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

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

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

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

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

Installing structural supports Install supports when roof has been weakened by sheet or structure cutting 276 1/2 James Langston

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

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

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

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

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

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 279 1/2

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

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

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

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

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

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