Should I use Fungicidal wash for the external house walls?

Question

Hello, 
My house has had intermittent problems with mould in the past years and recently we have been planning to repaint the outside of the house. A friend has suggested using a fungicidal wash before repainting the house to get rid of any remaining mould there may be. 
I know this can be quite strong stuff, so I am hesitant to use it if it’s not required. 
Has anyone had any experience of using a fungicidal wash on the external walls of houses? 
Additionally, any specific brands or other suggestions would be appreciated. 
Thanks.

Paul · Accepted Answer

Yes that’s fine to use. Or you could just use disinfectant

Charlie · Answer

Hi, yes you need to use a fungus killer on the area that you see growth. The area needs to be treated prior to painting. Failing to do so will ruin the paintwork as the mould will eat its way through in no time. You can get a quick dry one and they don't cost a lot.

Ohene · Answer

Yes, you can wash the walls with that then white wash the walls with anti mould paint before you apply your main colour paint.

Christopher · Answer

Yes, I have used a similar sort of product when painting the roof tiles of a house, unfortunately, like they say your painting is only as good as your prep so if you want it to last I suggest using it but taking the right health and safety precautions.

Stuart · Answer

The short answer is yes.
You should use the fungicide as per directions, which usually say to allow it to dry overnight, rinse down the following day and allow to dry again overnight before proceeding.
Depending on the surface you are left with, you might also need to consider a subsequent application of stabiliser prior to painting.
But it’s not really the best time of year to be considering painting the exterior of a property.

Sandtex does the required products.

Paul · Answer

Yes it works.

Pick the areas you need to wash, thin the fungicide down with water.

Wire brush the areas affected.

Then you are good to go with a decent exterior masonry paint. Don't go cheap.

Mark · Answer

Washing walls with fungi wash use hand gloves and eye protection wash off afterwards when dry.

Craig · Answer

The fungal wash will get rid of it but it may come back in time if there are trees close by.

Terry · Answer

You can use fungicide wash but use a primer before your main colour

Dennis · Answer

Hi

I use a product called Patio Magic.

It works efficiently to kill green moss & algae with long lasting results. I use a hand pump sprayer to apply it (no scrubbing required). Very fast acting. Moss & algae will be dead within 2 days. This must be done before painting the walls of the house.

Should I use Fungicidal wash for the external house walls?

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