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

Introduction What are flashings

What is a penetration

Why do we need them258 1/3

Types of flashingsCustom made

Prefabricated258 2/3

Custom made flashingsSteel Gal Zinc aluminium coveredSheet zincSheet leadSheet copperSheet aluminiumStainless steel sheetNeoprene 258 3/3

Prefabricated flashingssteel Gal Zinc aluminium covered zinc leadcopperaluminiumStainless steelNeoprene259 1/1

Plan work activitiesEstablish what will be penetratedEstablish the type of material to be usedConduct a site inspectionGet specs for jobCheck for structural alterations260 1/1James Langston south west TAFE

Type of Penetration pipeflueDuctSky LightRoof structure261 1/2

Establishing material typeConcealed fixings

Pierced fixed roof261 2/2

Conduct site inspectionIs the penetration clear of !!!!!!!!

Electrical wiring Building servicesOther pipe workRoof supports262 1/4

Building plans You need to be able to !!!!!

Read a Job PlanEstimate job requirementsUnder stand your task262 2/4

Check for structural alteration

Safety mesh

Need to be reinforced

Check the structure

Insulation262 3/4

Quality assuranceProceduresMaterialsHandlingMaintenancespecifications

262 4/4

Safety PPEOverallsBootsSafety glassesEar plugsDust mask

GlovesSun screenHard hat263 1/1

How did that get in thereJames Langston's wife

Tools and equipment

ScaffoldingE,W,PLaddersHand toolsPower tools

SignageElectrical leads264 1/1

Make the work site safeWater lines- Flooding

Gas Lines- fire hazard

Electrical- electrocution

Cutting members- structure weakness 265 1/2

Worksheet questionsAnswer question one and two on your work sheet

265 2/2James Langston

Determine flashing requirements266 1/2

Penetration between ribsMust have an up stand with a base plate

Be sealed to roof surface266 2/2

Tapered skirtSealed around penetrationOverlap up stand by no lass then 50mm

267 1/2

Synthetic rubber flashingInstall to manufactures specifications267 2/2

Penetrating the ribRib to be sealed to avoid rain water entering268 1/3

Flashing large penetrations 268 2/3

Worksheet questionsAnswer question three and four on your work sheetJames Langston

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

Quantities @ MaterialsMatching existing materials

Right size

Avoid contact between dissimilar metals

Draining from upper to lower roof must correct materials269 2/2

Quantities @ qualityRight sheetsRight lengthRight fastenersRight sealantCorrect size flashingsMaterials compatible 270 1/1

Carry out the jobAdequate drainageRoof supportsSupports for flashingOH&SSwarf removalWater tight ribsAnti-capillary cuts

271 1/1

Roof structure support timbers

Support the opening with timber

272 1/2

Worksheet questionsAnswer question five on your work sheet

Ribs272 1/2

Ribs273 2/2

Stop ends in traysFull height of ribTurn up to 75 Deg

274 1/2

Cutting the surfaceEnsuring joints are flushJoints Lapped the right wayJoints secureKeep power leads away from sharps Do not use carborundum cutting disks

274 2/2

Ensuring joints are flushAvoid the build up of undrained water on roof275 1/4

Ensuring joints are lapped in the direction of the outlet

275 2/4

Ensuring joints are secure Allowances forWind pressureThermal movementWater tightness275 3/4

Preparation of openingCompatible materialLarge enough to drain the waterAnnular space275 4/4

Installing structural supportsInstall supports when roof has been weakened by sheet or structure cutting

276 1/2James Langston

Flashing of large ductDimension the openingSheets are cutRoof reinforcedSoaker made up and installedApron made and installedRemove swarf277 1/2

Soldering

Not common these days becauseOther methods availableMaterial type

277 2/2

SealantsCommonly usedContaining silicone rubberMany colours Suitable for roofing278 1/2

Worksheet questionsAnswer question seven on your work sheet

Benefits of siliconeStick to most materialSealant flexibleLast at least 30 years

278 2/2

Take care using siliconeSurface free of greaseRead instructionsSurface must be cleanCan clean with non-carcinogen solventJoints to be fixed 25mm wide seal jointSeal to cover fixings279 1/2

Jointing procedure AssembleDrillRemove burs cleanPlace sealantReassemble jointSeal rivets or screwsClean off extra silicone279 2/2

Questions and answersAnswer question eight in the work book280 1/1

Assessment taskTask 175mm425mm300mm150mm

Assessment taskTask 2

Assessment taskTask 3

300mmMeasurement to suit job450mm75mm

Assessment taskTask 4300mmx300mmAll minimum laps, overlaps and expansion allowances and other relevant dimensions must comply with SAA HB39 1997