Condensation on windows: why it appears and how to fix it in Barcelona
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 Barcelona
0–150 €
Diagnosis or vents.
Contexto local · Barcelona
Outdoor winter humidity is high in Barcelona.
Barcelona is the bulk of our work and demands judgement: Eixample is full of modernista buildings with 3 m+ ceilings, original gotelé render, electrics with no RCD and cast-iron stacks still in service — all of which stretch any refurb. Gràcia and Sant Antoni are dominated by 1930s–60s flats with hydraulic-tile floors we have to protect before touching walls. Ciutat Vella adds narrow building entrances and BCN ASIA façade rules, so we coordinate scaffolding and permits when needed. Sant Martí (22@) is another world: new-builds and offices converted to lofts that drag along under-sized electrical panels. The ZBE low-emission zone and AREA paid parking push us to load/unload early to keep costs down.
- Comarca: Barcelonès
- Población: 1.660.122 hab.
- Parque de vivienda predominante: piso-eixample
- Año medio de construcción: 1955
- Códigos postales: 08001, 08002, 08003, 08004, 08005, 08006, 08007, 08008, 08009, 08010, 08011, 08012, 08013, 08014, 08015, 08016, 08017, 08018, 08019, 08020, 08021, 08022, 08023, 08024, 08025, 08026, 08027, 08028, 08029, 08030, 08031, 08032, 08033, 08034, 08035, 08036, 08037, 08038, 08039, 08040, 08041, 08042
Capital catalana con un parque de viviendas dominado por pisos del Eixample, fincas modernistas y bloques de los 60–70 en distritos como Sant Andreu o Nou Barris.
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