Mould health and safety
Showing results 1-12 of 16
Black staining on stained or clear-finished timber weatherboards
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Mould growth on timber surface; occurs most commonly on south-facing walls
Subfloor – mould areas on underside of flooring
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Damp subfloor space and/or lack of ventilation
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Leaking water or waste pipe
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Overflow or leak from wet area fixtures such as bath, shower, handbasin, dishwasher, clothes washer, hot water cylinder
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Inadequately waterproofed tiling in wet area such as no waterproofing membrane under tiles
Roof space – insulation is wet
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A leak through roofing, around a chimney, flue or other roof penetration, from an inadequately flashed parapet or an overflowing internal gutter
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Leaking pipes or water tanks in the roof space
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Moist subfloor air moving through brick veneer cavity where the cavity is open to the roof space and to the subfloor space
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Moist subfloor air moving through an uninsulated framing space where holes were drilled in top and bottom plates to allow framing to dry when wet timber framing was used for construction
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Moist air flow from kitchens and bathrooms into the roof space through wrongly installed ceiling vents or open recessed downlights
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Kitchen and bathroom extractor fans discharging into the roof space
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Aluminium foil used instead of a roof underlay, resulting in moisture condensing on the foil rather than being absorbed by the underlay
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Moisture from the cavity of brick veneer-clad walls where the cavity is open to the roof space
Roof leaks (visible as wet framing or water path stains)
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Cracked, missing or dislodged tiles or shingles, or corroded metal roofing
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Roofing sheets do not have turn-ups to the top end
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Missing nail heads or waterproofing washers
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Flashing has lifted, corroded or been damaged
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Corroded, damaged or blocked valley or internal gutters
Roof space dampness
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A leak through roofing, around a chimney, flue or other roof penetration, from an inadequately flashed parapet or an overflowing internal gutter
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Leaking pipes in the roof space
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Moist subfloor air moving through brick veneer cavity where the cavity is open to the roof space
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Moist subfloor air moving through uninsulated framing space where holes were drilled in top and bottom plates to allow framing to dry when wet timber framing was used for construction
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Moist air flow from kitchens and bathrooms into the roof space through wrongly installed ceiling vents or open recessed downlights
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Kitchen and bathroom extractor fans discharging into the roof space
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Header tank in the roof space has no lid
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Moisture from the cavity of brick veneer-clad walls where the cavity is open to the roof space
Ceiling joists sagging
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Ceiling joist spans too great for the timber size
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Joists have been overloaded
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Poor quality timber
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Cracked or broken timber
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Light roof cladding has been replaced with a heavy roof cladding
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Timber has rotted due to leaks or high roof space moisture
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Build up of sand inside roof space in beachside properties with concrete or clay tile roofs
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Internal wall has been removed
Interior musty smells
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There is a high level of moisture in the rooms due to a combination of poor ventilation, not enough heating, and/or poor insulation
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Dampness from the subfloor is getting into the rooms through gaps in the flooring and through service holes cut in framing
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Mould is present on surfaces and fabrics
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High levels of roof space moisture are lifting moisture levels in the rooms
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There are wall or roof leaks
Ceiling mould/mildew growth
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Condensation forms on the ceiling because the roof space is not insulated - mould growth is the result of regular condensation occurring
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Not enough fresh air ventilation to the space
Ceiling mould/mildew growth adjacent to the external walls
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Condensation forms on the ceiling because the roof space insulation has not been taken to the eaves
Ceiling – water staining
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Leaking roof or deck; overflowing gutter; leaking parapet, balcony, roof/wall junction
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Leaking pipes, header tank or hot water cylinder in the roof space
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Condensation in the roof space from high moisture levels
Plasterboard ceiling sagging
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Insufficient number of plasterboard sheet fixings; fixings inadequate to hold plasterboard sheets; ceiling lining has had weight applied such as a person standing on the lining instead of joists in the roof space
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Ceiling joist spans are too great for the timber size; joists have been overloaded
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Joists have rotted due to leaks or high roof space moisture levels
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Water from roof leak wetting insulation and being absorbed by ceiling lining
Softboard ceiling deterioration
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Moisture absorption
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Leak(s) in the ceiling
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The softboard is at the end of its serviceable life