Subfloor humidity
82%→55%
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Have a play with the toggle — here's what's going on under a Sydney floor, in plain English.
Old air vents get painted over and the air under your floor stops moving. Damp from the ground just sits there, soaks into the floorboards and creeps up your walls — that's the musty smell, the peeling paint and the black mould you can see inside.
Quiet fans gently pull fresh, dry air right through the subfloor on a timer. The ground dries out, the damp has nowhere to sit, and your floors and walls stay dry — so the smell clears and the mould stops coming back.
The right system depends on your subfloor's size, access and how blocked the airflow is. We assess on-site and fit the right one — here's the range.
Brick or wall vents let air cross the subfloor on its own. Silent and free to run — but only enough by itself for well-exposed homes with mild damp.
A quiet mechanical fan on a timer pulls stale, damp air out and draws fresh air in through the vents — the reliable fix for most Sydney subfloors.
Fans on both sides — one pushing dry air in, one drawing damp air out — for a forced cross-flow that reaches every corner.
We fit the German-made Blauberg Turbo range — quiet, 2-speed mixed-flow fans. On a timer they only run about 8 hours a day, so the running cost is tiny. Slide to your own power rate and run time:
Figures use the Blauberg Turbo 2-speed power draw, running 8 hours a day, 365 days a year, at the rate you set above. NSW residential usage rates averaged roughly 28–35c/kWh in 2026 — so even the biggest fan runs for about the price of a coffee a fortnight. Your real figure depends on fan size, speed setting and your power plan.
That "old house" smell that hits when you walk in — it's coming up through the floor.
Black spotting low on internal walls, in wardrobes and behind furniture.
Timber boards lifting at the edges or bouncing underfoot as moisture swells them.
Foggy windows and a clammy feeling indoors, worst through the cooler months.
Soft, decaying joists and bearers — the structural cost of years of trapped damp.
Mould spores from below circulate upstairs, flaring hay-fever and breathing issues.
A balanced system gently draws fresh, drier air in one side and pushes humid air out the other, cycling the whole subfloor several times an hour.
We pop over, log the humidity and airflow, and check your access — no pressure, no jargon.
Quiet fans pull cool, drier outside air into the dampest spots under your floor.
Stale, moist air is moved across and out the other side — no soggy dead pockets left.
Set once and forget it — it runs through the day, switches off overnight, and you'll never hear it.
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We’ll measure the moisture, check your access and give you a friendly, fixed quote — no pressure, no obligation. Call now or send your details and a real local will get back to you.