Weathertightness
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Timber slat decks – deterioration of decking/cladding
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Decking and framing was installed hard against the building cladding
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Accumulated dirt and debris is trapped against the cladding
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There are leaks into the wall framing at fixing points
Timber slat decks – water leaking into house
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Water is tracking along the bolts used to fix the deck to the wall cladding/framing
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The decking/framing is hard against wall cladding
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The decking is blocking drainage from a drained and vented cavity
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Deck framing or decking is blocking drainage slots in brick veneer
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Where deck joists are cantilevered out from the wall water is tracking along the joists into the building
Waterproof decks – water ponding
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Poor drainage due to inadequate fall to outlets
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The drainage outlet is blocked
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The outlet is too small for the volume of water on the deck
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The slope is not towards the drainage outlet
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Sagging of deck/balcony structure
Waterproof decks – water leaking into the house
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The threshold from the house down to the waterproof deck or balcony is not deep enough
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The deck membrane is not turned up enough (150 mm minimum) behind the bottom of wall and solid barrier cladding
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Wind is stopping water from draining away from the wall
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Water splash from a downpipe is discharging onto the deck close to the wall
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Ponding water is wicking up the wall cladding where there is not enough clearance between decking and cladding
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Water is ponding and not draining away from the wall of the house
Waterproof decks – deterioration under cantilevered balcony
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Inadequate drainage from the balcony
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Damage or penetrations through the decking membrane
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Water entry into the balcony floor and/or wall framing
Waterproof decks – impact or puncture damage
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Careless walking on the roof or the membrane is not suitable for foot traffic
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There are sharp or hard objects on the roof
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Nails in the substructure have popped, puncturing the membrane from underneath
Waterproof decks – surface cracking, blistering, buckling or crazing
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UV degradation
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Expansion/contraction of substrate causing over-stressing and failure of the membrane
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The material is at the end of its serviceable life
Waterproof decks – the deck is springy
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There is damage to the substrate and/or framing due to water entry through the membrane or through adjacent wall claddings
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The substrate material is not thick enough to span the rafters/joists
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The particleboard used as a substrate has deteriorated
Waterproof decks – seam separation or failure
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Inadequate heat welding during installation
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Loss of adhesion at the joint
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Expansion/contraction of the membrane
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Water has got under the membrane causing a breakdown of the adhesive
Waterproof decks – membrane turn-ups improperly installed
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Poor detailing and/or installation to membrane turn-ups at walls and doors (potentially allowing water entry)
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The waterproofing membrane was applied/laid after the cladding was installed
Tiled waterproof deck – water leaks
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There is no waterproof membrane behind the tiles
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The waterproof membrane was damaged during tiling
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The membrane was poorly applied
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Tiles were applied before the liquid applied membrane had cured
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Water is ponding on the surface and seeping thorough membrane joints
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Grouted or sealant filed joints have failed
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The membrane was not designed to have tiles glued to it
Balustrades and barriers – water entry/deterioration of solid balustrade
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Hairline cracking in monolithic (plaster) cladding
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The handrail is fixed to the top of solid balustrade wall
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There is no flashing or an inadequate flashing to the top of the solid balustrade wall
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There is a reliance on the plaster finish to provide waterproofing