Concrete plaster

Bjoernar

New member
Today when I was doing a housewash the neighbor came over asking me to take a look at his concrete wall which was covered in some sort of fungus. He told me piece of the plaster was sent to a lab that found it was fungus. I was pretty sure it was not, and hit it with some housewash mix and it did not touch it.

Please a look at the picture, the wall has some pressure treated wood for the plants to climb. Behind this the wall is clean.image.jpg
 
seen that one often here in New Zealand... I don't bother to send it off to the lab I just hit it with Hypo from my dedicated sprayer.
I mix the hypo at the rate of 1ltr to 10 of water with some dish wash in there as a surfactant.
Sometimes it takes up to three applications before its gone and can be washed off. It goes through various colour changes before it has bleached right out.
Always on stucco or rough caste surfaces but occasionally find it on weather board as well.
When your customer see's it is gone they think you are marvellous.
 
It was the homeowner who had sent a sample to a lab a while ago.

When the guy wet his finger and scrubbed the stuff, it turned to a sharp yellow color.

I tried hitting it with my downstream mix and it did not touch it. Then I tried straight 15% hypo in a pump up, nothing happened to it.
 
Yep can be a pita. Red algae multiple applications with a dedicated pump usually work best for me. 1% - 1.5% mix on vinyl
 
Yep can be a pita. Red algae multiple applications with a dedicated pump usually work best for me. 1% - 1.5% mix on vinyl
Yep that's the one... I would be using the same mix ratio 1:10 for me equals 1.2-1.5 SH
Just take a couple or three applications is all.
 
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