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Rising Damp HobartSolid masonry & sandstone 0468 163 360

Health

Damp and mould in a Hobart house

Mould needs moisture. Working out where the moisture comes from is the whole job, and in Hobart it is more often condensation than rising damp.

Mould is the symptom people act on, because it is visible and because of what they have read about it. Rising Damp Hobart arranges assessments that establish the moisture source, since cleaning mould off a wall that is still wet simply schedules the next clean.

Which problem produces which mould

Black spotted mould in corners, around window reveals, behind wardrobes and on ceilings is almost always condensation. Those are cold surfaces, and cold surfaces in a humid room are where water comes out of the air. It is the dominant damp complaint in a Hobart winter and it responds to heating, ventilation and extraction rather than to anything done to the masonry.

Rising damp produces less mould than people expect, because the salt it carries actively inhibits growth. What it produces instead is a tide mark, salt bloom, lifting paint and soft mortar. A wall with heavy black mould from the skirting to the ceiling and no salt is very unlikely to be a rising damp problem.

What to do first

Ventilate deliberately

Extraction at source in kitchen and bathroom, and air movement in rooms that are shut up. Two weeks of this will tell you a great deal about which problem you have.

Stop drying washing indoors

A single load releases litres of water into the air. In a cold, closed house that water goes onto the walls.

Heat more evenly

Intermittent heating produces cold surfaces for condensation to form on. Low continuous background heat produces fewer of them than short bursts.

Then meter the wall

If the mould persists, or there is salt and a level tide mark, that is when an assessment is worth paying for.

What we will not tell you

We are not medical practitioners and we do not give health advice. If you are concerned about the effect of mould on someone in the house, that is a conversation for a GP or Public Health, not for a damp referral service. What we can do is establish where the water is coming from, which is the part that stops it returning.

White salt crystals blooming across a sandstone wall at ground level, with the stone flaking behind them.
Illustration Efflorescence is the salt the water left behind. Wiping it off treats the symptom and nothing else.

Suburbs we cover

We cover Hobart and the surrounding suburbs, from the Georgian cottages of Battery Point to the post-war brick of Glenorchy and Moonah.

Book a free rising damp assessment

Someone comes out, meters the walls, looks at the ground levels and tells you what is causing it. You get that in writing before anyone quotes a repair.