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Damp Proofing

Black mould in bathroom ceiling in winter months

Anonymous user 28/02/2024 - 3.01 PM

We develop black mould on the ceiling of the bathroom and child's room in the winter months. We have paid £500 to have vents put into the roof last summer but the problem persists. Tried anti mould paint, the mould wipes off. When this happens there are droplets of water on the ceiling like condensation. Is there anything that can stop this?

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2 Answers

Trident Damp

Rating: 5 out of 5

Sidcup

Hi there Venting the roof is great for the roof space but has no bearing on the condensation internally You need better ventilation in these rooms using better extractor fans and also checking that you have sufficient insulation above these ceilings, worth using double insulation to keep the ceilings warmer as they must be getting cold which is a major cause of condensation. regards Joseph

Answered6 February 2014

a.l. plastering

Rating: 5 out of 5

Ruthin

Trident damp is correct. The warm air hits the cold areas walls/ceilings causing condensation. I often use insulated plaster boards (depending on requirements) with vapour barriers. This makes the areas warmer and much less susceptible to mould. Ventilation is also a factor especially in areas where airflow is restricted. Bathrooms, kitchens and drying washing on radiators releases water into the air which has to go somewhere.

Answered17 July 2014