Mould on render

[RrogerD]

Hi,
I don't think that I have asked this before so here goes...

The external painted render is mouldy. In the past I have scrubbed with bleachy-water and re-painted but it re-appeared. Another time, I scraped the top surface coat of paint off, revealing mouldy paint underneath. I then did the same, scrubbed with bleachy-water and re-painted. It was better, for longer but it has now all come back again.

Any suggestions for solutions to this?

Thanks

 

[Wayners]

Is that a west facing wall?.
That's going to be battered with rain and get no sun.
I think I'd be looking at cladding so all it needs is a pole wash

 

[jj4091]

Treat with one of these perhaps

Google Search

I know this one works

https://www.screwfix.com/p/wet-forget-mould-lichen-algae-remover-2ltr/143CX?gclsrc=aw.ds&gad_source=1&gad_campaignid=19823510113&gclid=CjwKCAjw0dPRBhAPEiwAE5vTThXbEbTDGFWY-Hl_VRTmaGg5XDsnrXNWLUYTQeY0WQh8ET_EMwzzgxoCvvAQAvD_BwE

 

[RrogerD]

Is that a west facing wall?.
That's going to be battered with rain and get no sun.
I think I'd be looking at cladding so all it needs is a pole wash

It's south west. It sits in the sun pretty much all day every day.
However, we are next to a heritage steam railway. I think the soot smuts don't help things.
Thanks for the idea for cladding but it isn't going to happen. I just want to clean and re-paint.

 

[RrogerD]

Treat with one of these perhaps

Google Search

I know this one works

https://www.screwfix.com/p/wet-forget-mould-lichen-algae-remover-2ltr/143CX?gclsrc=aw.ds&gad_source=1&gad_campaignid=19823510113&gclid=CjwKCAjw0dPRBhAPEiwAE5vTThXbEbTDGFWY-Hl_VRTmaGg5XDsnrXNWLUYTQeY0WQh8ET_EMwzzgxoCvvAQAvD_BwE

Thanks.
I did this(Googled) of course. They all seem to be apply and wait a few days.
If they work, or not, I guess nothing ventured.
Cheers

 

[Wayners]

Whatever paint you use add vc175 to it.
Wooden spoon in a drill is a good way to mix

 

[RrogerD]

Whatever paint you use add vc175 to it.
Wooden spoon in a drill is a good way to mix

Thank you. Useful tip.

 

[foxhole]

https://www.amazon.co.uk/Wet-Forget-Mould-Lichen-Remover/dp/B0187LUYKY

 

[RrogerD]

I've made a start in scraping off all of the old paint. There is moss spores on the surface (the black bumps) but also, mould on the render beneath the paint.

I purchased some of the 'wet and forget' stuff but, it says, 'can take up to 12 months to be fully effective', or words to that effect.

Instead, do you think it would be a solution to apply SBR to the whole area, to seal in the mould (it's soaked into the render surface) and then paint over this? I can't really afford to wait 12 months with it.