Mechanical ventilation
Showing results 1-12 of 17
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
Roof space – flexible ducting is crushed/folded
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Poor initial installation
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Ducting has been shifted or crushed when work was carried out in the roof space
Roof space – flexible ducting is torn/punctured
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Poor initial installation
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Ducting has been shifted or crushed when work was carried out in the roof space
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 framing location visible on the ceiling
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Condensation forms on the ceiling along the lines of the cold bridges formed by the framing in an insulated roof space - mould growth is the result of regular condensation
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Condensation forming on areas of ceiling where there is no framing in an uninsulated ceiling
Wall linings generally – mould/mildew growth
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Condensation forming regularly because the wall is not insulated, the house is not sufficiently heated and/or internal moisture levels are too high
Wall framing location is visible
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Condensation forming on the areas between the framing because the wall is not insulated – mould growth is the result of regular condensation
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Mould is forming on the framing locations because a thermal bridge (framing has lower thermal performance than the insulated part of the wall)
Heat/light/fan extract units – fan grille is dirty/clogged
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Build-up of dust and lint around fan blades, motor unit and in ducting
Heat/light/fan extract units – fan gets noisy/stops working
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Worn or seized bearings
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Bearings need lubrication
Ventilation system is not working
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No power
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System not turned on
Ventilation systems – poor fresh air supply and stale air removal
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Grilles (external or internal) are blocked/dirty
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Air filters are clogged/require cleaning
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Ducts are blocked
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Duct joints are not sealed resulting in air leakage through joints
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System is unbalanced due to differences in supply and exhaust ducting
