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Construction moisture is one of the most underestimated causes of damp problems in new builds and renovations. Many homeowners assume they have a leak or rising damp, when in reality the building simply hasn’t dried yet.
This guide explains how construction moisture forms, how long drying takes, the risks involved and the mistakes that almost everyone makes.
Construction moisture is the water that enters or remains in a building due to:
wet building materials
water used during construction
rain during the structural phase
plastering and painting
concrete, mortar and screed
A new home contains thousands of litres of water. All of it must evaporate.
Typical amounts:
Concrete floor (50 m²): ± 500 litres
Screed (50 m²): ± 300 litres
Plasterwork (200 m²): ± 800 litres
Masonry: ± 200–400 litres
Total: 1,500 to 2,500 litres of water.
That’s the equivalent of a full jacuzzi inside your walls and floors.
Drying time depends on:
temperature
ventilation
material type
thickness of the structure
season
relative humidity
| Material | Average drying time |
|---|---|
| Masonry | 6–12 months |
| Plaster | 4–12 weeks |
| Screed | 6–12 weeks |
| Concrete | 3–12 months |
| Timber frame | 2–6 weeks (with proper ventilation) |
In winter, drying can take 2–3 times longer than in summer.
Typical signs:
condensation on windows
damp patches on walls
musty smell
mould in corners
peeling paint or plaster
damp floors or skirting boards
high indoor humidity (above 60%)
But construction moisture appears everywhere, not just at the base of walls.
Mould develops when humidity exceeds 70%.
Moist air contains more spores and bacteria.
blistering
peeling
cracking
Moisture activates salts → crystal pressure → damage.
Wet walls are colder → more condensation.
Floors, paint and insulation can only be installed once the structure is dry.
Open windows daily, ideally opposite each other (cross‑ventilation).
Warm air holds more moisture → faster drying.
Essential when large amounts of moisture are present.
Do not use:
latex paint
tiles
vinyl
cement‑based coatings
These trap moisture.
Drying takes time. Rushing the finishing phase leads to long‑term problems.
Latex paint traps moisture → blistering.
Moisture gets trapped under tiles or parquet → mould and detachment.
Cold air contains less moisture → ideal for drying.
Warm air absorbs moisture → but without ventilation it stays inside.
Construction moisture is everywhere; rising damp is only at the bottom of walls.
Renovation plaster is for salt problems, not for drying new walls.
When:
the building is older than 12 months
no wet materials remain
indoor humidity stays below 55%
no new moisture sources are present
Then the problem is no longer construction moisture but:
condensation
rising damp
leaks
thermal bridges
Construction moisture is normal but often misunderstood. A new building contains thousands of litres of water that must evaporate. If drying is insufficient, mould, plaster damage, damp patches and salt problems appear.
Key insights:
drying can take 6–12 months
ventilation + heating = best combination
avoid vapour‑tight finishes
construction moisture is often mistaken for rising damp
finishing too early causes long‑term damage
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