Please help!

daisyrose

I am looking for advice and help please.
Every year we wash and bleach the mould spots on the living room ceiling but the mould is winning and the ceiling is stained. I need to stop this for good as I am ready to give in. 

I want a white Matt finish to the ceiling. Should I use anti condensation paint, anti mould paint or that stuff you add to the paint? I need help please. How do I stop the mould and have a nice ceiling  for good? 

I welcome any advice.

Today's humidity 100%. We have the usual air flow and dehumidifiers but we still have mould. No leaks no wet washing and bathroom doors closed when in use.

Thank you in advance.

CliveOfIndia

As far as the paint goes then the best bet is to wash the mould off with a bleach solution (as you have been doing), go over it with stain-block, then paint over that when it's dry.

But you really need to address the cause, otherwise it'll just come back.  You say the humidity is 100% ?  Something's wrong there - especially if you're running a dehumidifier and you've got decent ventilation.  Mould indicates that there's damp coming from somewhere.  It might take a bit of digging around to find out where, but you do need to stop it at its source.

victor2

Clean it as usual and let it dry, then apply a zinsser paint such as this:
https://www.zinsseruk.com/product/perma-white-interior/
I've used their Cover Stain before and it works a treat.

grumbler

Living room? Is it a bungalow? If so, is the loft insulated well enough?

Regarding bleach, it reportedly doesn't kill mould. Allegedly, white vinegar or hydrogen peroxide do this better.

housebuyer143

I would clean it off and paint over it with some form of zinsser undercoat - go for the mould one. 
This stuff is awesome and have seen contractors use it in rentals to stop mould coming through and it's worked amazingly.

CurlySue2017

grumbler said:

Living room? Is it a bungalow? If so, is the loft insulated well enough?

Regarding bleach, it reportedly doesn't kill mould. Allegedly, white vinegar or hydrogen peroxide do this better.

I can personally vouch for white vinegar for removing mould, as that's what I use and it works great (plus doesn't have that awful bleachy smell).  I don't know if it actually kills the mould, but it certainly gets rid of it

FreeBear

grumbler said: Regarding bleach, it reportedly doesn't kill mould. Allegedly, white vinegar or hydrogen peroxide do this better.

One thing to bear in mind - Ceilings (and walls) are usually plastered with gypsum or lime. Both are easily attacked by acids. Vinegar is mildly acidic, so could eat in to the plaster.

daisyrose

Yes it is a dormer bungalow. Good guess? There are parts where there is no access to the roof space. When we moved here there was painted anaglypta every where and no mould that I remember. We do get some small areas of mould on other walls in other rooms but that usually washes off easily.
I have used vinegar but always found the bleach the best to use.
So it looks like I should look at the zinnser range unless anyone can recommend anything else.
When we cleaned the ceiling this time there was soot on the ceiling and now there are nasty marks from that as well so I need something that blocks stains and stops mould.

markin

It should not be possible to have 100% humidity the dehumidifier on 24hrs a day? Or the Temperature too low for it to work?

How many litres a day are you getting?

GDB2222

daisyrose said:

Yes it is a dormer bungalow. Good guess? There are parts where there is no access to the roof space. When we moved here there was painted anaglypta every where and no mould that I remember. We do get some small areas of mould on other walls in other rooms but that usually washes off easily.
I have used vinegar but always found the bleach the best to use.
So it looks like I should look at the zinnser range unless anyone can recommend anything else.
When we cleaned the ceiling this time there was soot on the ceiling and now there are nasty marks from that as well so I need something that blocks stains and stops mould.

Where’s the soot from? Do you have an open fire? A stove? 

Burning hydrocarbon fuels, like wood, produces a lot of moisture. So, maybe that’s the cause of the problem. 

You can paint it, but the mould is on the surface of whatever paint you use. You really need to find out where the moisture is coming from. 

housebuyer143

I lived in a dormer bungalow funnily enough and we had a massive issue with mould on the walls. Turns out it was too humid in the winter so we bought a dehumidifier and put it on a few hours a day in the winter. Completely solved the mould reoccurring and then we covered it with zinsser 123 bin -the oil based one and never saw the mould again. 
It's expensive but that stuff is amazing for so many things and I used it for lots of DIY purposes now.