Damp patch on the wall in El Masnou: how to identify the cause
Resumen rápido
Shape and location tell you if it's rising damp, condensation or a leak.
¿Qué está pasando?
Each type of damp has a different cause and fix.
Causas más probables
Rising damp from ground
mediaGround floors and basements.
Leak from neighbour or roof
mediaCeiling patch that grows with rain.
Condensation on cold outer wall
altaUninsulated corners.
Internal plumbing leak
mediaPatch grows with water use.
Pasos de diagnóstico
- 1
Look at position and shape
Floor=rising, ceiling=leak, corner=condensation.
- 2
Touch it: wet or just stained?
Tape clingfilm 24h: drops mean active damp.
- 3
Document with dated photos
Dated photos are your evidence.
Cuándo llamar a un profesional
Call for diagnosis if active or growing.
Coste orientativo en El Masnou
60–350 €
Hygrometer diagnosis.
Contexto local · El Masnou
Ground floors near the sea have rising damp.
El Masnou is a thin strip between the C-32 and the sea with two realities: the upper part (Sant Felip, Ocata-Alt) is single-family homes with views, and the lower part (Centre, seafront) is 1960s–80s flats whose balconies face the N-II. Salt exposure is high: any external locksmithing or blinds get a marine treatment. The upper area drives periodic maintenance (garden, pool, heat pump); the lower area drives full refurbs that open up closed layouts. Parking is OK uphill, tough near the Renfe station.
- Comarca: Maresme
- Población: 23.579 hab.
- Parque de vivienda predominante: unifamiliar
- Año medio de construcción: 1985
- Códigos postales: 08320
Frente marítimo elegante con casas de indianos, mezcla de unifamiliares y bloques modernos.
Preguntas frecuentes
Who pays if it's the upstairs neighbour?
Their insurance or the community.
Can I just paint over it?
Only if completely dry and fixed.
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Más sobre Damp, mould and paint
Sources and regulation
- CTE DB-HS 1 — Protección frente a la humedad — Código Técnico de la Edificación