Condensation on windows: why it appears and how to fix it in Sabadell
Resumen rápido
Condensation is indoor air water cooling on the cold glass.
¿Qué está pasando?
The air in the room has too much humidity.
Causas más probables
Lack of ventilation
altaSealed flats without airing trap vapour.
Cold window, no thermal break
altaOld aluminium or single glazing.
Drying laundry indoors
altaOne load releases 2–3 L of water.
Poorly set heating
mediaHigh temp + closed windows.
Pasos de diagnóstico
- 1
Air the rooms for 10 minutes
Open opposite windows.
- 2
Wipe the glass and measure humidity
A hygrometer costs €8–15.
- 3
Cover pots and use the extractor
Cooking uncovered releases litres of vapour.
- 4
Dry laundry outside or with window open
If not, a dehumidifier.
Cuándo llamar a un profesional
If it persists with low humidity, check the carpentry.
Coste orientativo en Sabadell
0–150 €
Diagnosis or vents.
Contexto local · Sabadell
Outdoor winter humidity is high in Sabadell.
Sabadell is the largest city in Vallès Occidental, mixing dense old quarters (Centre, Creu de Barberà) with 1980s–90s residential estates (Can Llong, Can Rull). In the old town we deal with buildings whose shared old stacks and tight courtyards rule out external insulation, so we strengthen things from the inside. In the estates, high-rise blocks have single-phase panels we have to rebalance before installing AC or an induction hob. Sabadell has a large self-employed population, so we often convert workshops into homes with three-phase wiring that we re-rate to REBT. C-58 jams early, so first slots go to local clients.
- Comarca: Vallès Occidental
- Población: 215.760 hab.
- Parque de vivienda predominante: piso-moderno
- Año medio de construcción: 1970
- Códigos postales: 08201, 08202, 08203, 08204, 08205, 08206, 08207, 08208
Capital del Vallès Occidental, con tejido industrial textil reconvertido y barrios densos como Ca n’Oriac, Torre-romeu y La Concòrdia.
Preguntas frecuentes
Does condensation cause mould?
Yes, if continuous.
Do salt absorbers work?
For a room, insufficient.
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Sources and regulation
- CTE DB-HS 1 — Protección frente a la humedad — Código Técnico de la Edificación