Mouldy bathroom ceiling - how to get rid and prevent it

Hi. This is my advice. 1. Clean off the exisisting mould with a cleaner for mould( there are so many about, ive recently used one from a pound shop....as effective as any other) wear gloves, goggles etc, vent the room, rinse clean. 2. Paint when dry with a good quality paint. There are your usual d.i.y bathroom paints. I use a paint made by zinsser called permawhite, or rustoleum's anti-germ paint. They both are high build, film forming paint with ingredients to inhibit mould growth. 3. On areas where mould growth has left a stain (usually in corners) i go belt and braces by applying zinnser b.i.n, the reason for this is to block the mould spores from re-igniting. 4. Do not use a matt finish, whatever paint you choose, 5. Vent the room after any episode of high humidity.

Also you need an extractor that doesn't go off immediately after you switch off the lights... one with a delay. This makes sure the fan runs for a good time after you have left the room ensuring the vapour has been extracted. vanmax.co.uk

You need to calculate cubic meters of your bathroom and check with your extractor technical details, is it not to small for your bathroom. Position of extractor fan is important as well. Usually is happen on cold bridge, if humidity is to high then moisture is accumulating there and is casing to mould grow. Is your paint are bathroom and kitchen purpose which is better than vinyl paint because is mould resistant.

Hi ventilation and extraction are paramount. when it comes to our bathroom fits we plan exactly where the fan/fans will go and the shortest route. cheap fans are not worth bothering with either. also does your window have trickle vents to allow the circulation of air? what size bathroom and what size radiator?

Timothy had got it pretty much spot on. Anyone using undercoat over mould stains are not solving the problem, only hiding it

There are a number of products to use but make sure you clean of as best you can before use. there is to use under coat then a coat of paint on top should hold back but unless you can find the problem there is no real fix