Red fungus on Pebble Dash External Wall

Wexford96

Hello.
I've had a red fungus type thing on the pebble dash of house. It's been there for approx. 15 years. I've googled a bit this week on how to get it off.
I've already power-hosed it- this took dirt away but not the reddish stuff. Wire brushed bleach into part of it-this too approx. 10 percent of it away, and turned it more orange than red. Then I bought a product from the farm suppliers that they recommended. I sprayed this on, waited 15 mins as instructed, and hosed the surface. This has had no effect. Is there any other way to get this off the wall?
Thank you.

chooseusername

I had this red algae stuff on the walls
I used that Mossgo stuff and it worked well, but my walls were smooth render.
It hasn't come back in 4 years, but having said that I also removed a lot of the trees around the house,
and the airflow and light was improved.

twowheelsonly

A crowd called 'Red Gable Cleaning' (I think..) seem to be the people to talk to on this. I've never had this problem but plenty do including my brother. Power washing is only a waste of time and effort as are bleaches etc. They did his place and while it made a nice difference straight away it was in the following weeks that it really improved as the algae died off.

As far as I know they're Longford based but I'll see if I can find a link for them.


EDIT: Found them !! http://www.redgablecleaning.com/gallery.html

wait4me

I would use a half and half bleach water mix. On a dry day spray it on. After an hour or so; hose it down. Might need a second spray. Trick is to leave it before hosing. Works for me on pebble dash or rendered walls. I think the stuff you got from the farm suppliers is also a similar mix. I think its clorox? That too should do the trick but a little patience is required whatever you do. Let the stuff work before hosing down.

Plumbthedepths

I spray the walls with diluted bleach and water. 50:50. I do it every year. Works a treat and a 2 litre bottle of thick bleach is 92 cent in Aldi.
If the red goes orange just spray again, it will come off but needs a little time.
Also diluted Jeyes fluid is great for getting rid of moss on a roof and biological washing powder ( Aldi again)is good for killing moss on a tarmac driveway.

jack of all

Pretty much as above- I had some bad discolouration on a dashed wall (white sand cement butter coat) from red algae; the house was built about 18 years at the time. I sprayed the walls with a solution of thick bleach/ water and a little washing powder added in. I did this about two years ago. Initially the result was a little disappointing- the algae turned red, but after some time, exposure to the sun and rain the render returned to pure white and looks really good (especially comparted to neighbouring houses) nearly two years later. Just make sure you spray ona still day (I used a knapsack sprayer) as the spray will drift!

Deagol

Local DIY shop recommended using moss killing stuff for the lawn on it. I sprayed half the wall to see and left it for a week or two and the stuff was almost 100% gone.

Wexford96

chooseusername wrote: »

I had this red algae stuff on the walls
I used that Mossgo stuff and it worked well, but my walls were smooth render.
It hasn't come back in 4 years, but having said that I also removed a lot of the trees around the house,
and the airflow and light was improved.

Looks nasty. Good on you for getting rid of it.

Wexford96

Deagol wrote: »

Local DIY shop recommended using moss killing stuff for the lawn on it. I sprayed half the wall to see and left it for a week or two and the stuff was almost 100% gone.

Interesting. Might be worth a try. Thanks.

Wexford96

jack of all wrote: »

Pretty much as above- I had some bad discolouration on a dashed wall (white sand cement butter coat) from red algae; the house was built about 18 years at the time. I sprayed the walls with a solution of thick bleach/ water and a little washing powder added in. I did this about two years ago. Initially the result was a little disappointing- the algae turned red, but after some time, exposure to the sun and rain the render returned to pure white and looks really good (especially comparted to neighbouring houses) nearly two years later. Just make sure you spray ona still day (I used a knapsack sprayer) as the spray will drift!

Hi. Did you ever rinse it down with water afterwards? Or did you just leave that mixture to seep into the wall without rinsing? Thanks.

Wexford96

Plumbthedepths wrote: »

I spray the walls with diluted bleach and water. 50:50. I do it every year. Works a treat and a 2 litre bottle of thick bleach is 92 cent in Aldi.
If the red goes orange just spray again, it will come off but needs a little time.
Also diluted Jeyes fluid is great for getting rid of moss on a roof and biological washing powder ( Aldi again)is good for killing moss on a tarmac driveway.

Yes, I was amazed a few years ago when I just threw loose washing powder on moss covered tarmac, and a few days later the moss was dead.

Wexford96

wait4me wrote: »

I would use a half and half bleach water mix. On a dry day spray it on. After an hour or so; hose it down. Might need a second spray. Trick is to leave it before hosing. Works for me on pebble dash or rendered walls. I think the stuff you got from the farm suppliers is also a similar mix. I think its clorox? That too should do the trick but a little patience is required whatever you do. Let the stuff work before hosing down.

Hi. I don't think it's called Clorox, but it might have Clorox in it. It was a made in Ireland product called "red algae remover".

Wexford96

twowheelsonly wrote: »

A crowd called 'Red Gable Cleaning' (I think..) seem to be the people to talk to on this. I've never had this problem but plenty do including my brother. Power washing is only a waste of time and effort as are bleaches etc. They did his place and while it made a nice difference straight away it was in the following weeks that it really improved as the algae died off.

As far as I know they're Longford based but I'll see if I can find a link for them.


EDIT: Found them !! http://www.redgablecleaning.com/gallery.html

Interesting company, thanks for passing on their details. I'm determined to get this sorted myself, but good to know they're there should I fail. Cheers.

Cerco

Wexford96 wrote: »

Hi. I don't think it's called Clorox, but it might have Clorox in it. It was a made in Ireland product called "red algae remover".

I think you mean Chloros Hypachloride. You should get it in farming co-op as it is used in cleaning milking parlours (I’m told). Costs about €20 for a €20 litre drum. Follow safety precautions on container. You can use it diluted in a backpack sprayer wearing mask, goggles and gloves.

Hintel

I think I used biological washing liquid and water

No alga since

twowheelsonly

Cerco wrote: »

I think you mean Chloros Hypachloride. You should get it in farming co-op as it is used in cleaning milking parlours (I’m told). Costs about €20 for a €20 litre drum. Follow safety precautions on container. You can use it diluted in a backpack sprayer wearing mask, goggles and gloves.

Chloras will clean it but won't kill it. You'll have the same thing within a year, or possibly even less. Bleach mixtures are the same.
Biological washing powders / solutions are a better option but don't seem to work on walls as well as on flat surfaces. Possibly because they run off too fast ? I used a biological powder on a concrete driveway in the front and on pathways in the back two years ago and it did a superb job. I dampened the ground and spread it fairly liberally and let the rain do the rest. Took a week or so to really clean it up but worked brilliantly.

Cerco

Wexford96 wrote: »

Hello.
I've had a red fungus type thing on the pebble dash of house. It's been there for approx. 15 years. I've googled a bit this week on how to get it off.
I've already power-hosed it- this took dirt away but not the reddish stuff. Wire brushed bleach into part of it-this too approx. 10 percent of it away, and turned it more orange than red. Then I bought a product from the farm suppliers that they recommended. I sprayed this on, waited 15 mins as instructed, and hosed the surface. This has had no effect. Is there any other way to get this off the wall?
Thank you.

Just reading your post again. If it is chloros then Fifteen minutes is way too short for it to do its job. Leave it for at least four or five hours before washing it off.

jack of all

Wexford96 wrote: »

Hi. Did you ever rinse it down with water afterwards? Or did you just leave that mixture to seep into the wall without rinsing? Thanks.

I'm pretty sure I just left it to soak in, it was during the great summer we had. Between the spray and the sunlight it did a great job. The rain came in its own good time and rinsed off whatever needed rinsing.

garv123

They sell stuff for red algae in most hardwares. Spray it on and leave it do its stuff. The rain washed all the dead stuff off. Didn't even have to power wash it

dok_golf

Bleach will kill whats on surface but not whats down in the plaster itself , You need a fungicide. ( bit like weedkillers that kill whats in front of you and the total ones that kill roots and all). These are readily available in any decent paint shop. fleetwood one is good as is Owatrol ATM007

Wexford96

twowheelsonly wrote: »

Chloras will clean it but won't kill it. You'll have the same thing within a year, or possibly even less. Bleach mixtures are the same.
Biological washing powders / solutions are a better option but don't seem to work on walls as well as on flat surfaces. Possibly because they run off too fast ? I used a biological powder on a concrete driveway in the front and on pathways in the back two years ago and it did a superb job. I dampened the ground and spread it fairly liberally and let the rain do the rest. Took a week or so to really clean it up but worked brilliantly.

And not too expensive. Thanks for your tip.

Wexford96

Cerco wrote: »

Just reading your post again. If it is chloros then Fifteen minutes is way too short for it to do its job. Leave it for at least four or five hours before washing it off.

Yes, that would go along with what I'm hearing here from others too. Thanks.

Ray Donovan

Cerco wrote: »

I think you mean Chloros Hypachloride. You should get it in farming co-op as it is used in cleaning milking parlours (I’m told). Costs about €20 for a €20 litre drum. Follow safety precautions on container. You can use it diluted in a backpack sprayer wearing mask, goggles and gloves.

This is the stuff to use. I built my house in 2016/2017. Twice a year I put this on my paths and they look the same as the day they were put in. (3.5 years ago)

I get a watering can and mix it 1ltr hypochloride and 9ltrs water. Pour it on the path area that amount will cover and brush it in with a yard brush. I leave it to dry naturally. Brings the paths up shining. The amount of people that have asked me how do I keep my paths so fresh!!! Its a proven algae killer.

For a wall you could mix it 50/50 and spray it on and see how it brings them up. Even a bit of brushing maybe.

This is the actual product I use http://cleanlinefarmservices.ie/portfolio-view/supercleen-rocklor/ but once the it's any sort of Sodium Hypochlorite you should be good.

Let me know how you get on.

Wexford96

Managed to get it off the wall finally. Chloros Hypachloride as recommended by Ray and Cerco here. Just sprayed it on from the backpack sprayer I use for roundup. Covered the wall making it as foamy as I could to avoid it just running down wall. Then came back after 3 hours with the power washer. And off it came. Was delighted to see dark red water running down the drain. Thanks for above replies to all of you who helped.

roady rhodes

Wexford96 wrote: »

Managed to get it off the wall finally. Chloros Hypachloride as recommended by Ray and Cerco here. Just sprayed it on from the backpack sprayer I use for roundup. Covered the wall making it as foamy as I could to avoid it just running down wall. Then came back after 3 hours with the power washer. And off it came. Was delighted to see dark red water running down the drain. Thanks for above replies to all of you who helped.

Hi, may i ask what ratio of product to water you used and also how did you get it foamy?
Have a similar job to do myself.Thanks.

Wexford96

Hi.
I mixed it 50-50 as one of the lads above recommended. I think that thickness helped get it into a scummy/foamy texture on the wall. So not too much water. Also, I applied it slowly/lightly. This helped it not come out too watery. This kept the foamy texture as opposed to applying it strong and fast. If I sprayed it too fast/strong, it all comes out as a forceful liquid and just rolls straight down off the wall.

roady rhodes

Great stuff. Thanks for tip

Baoithin66

any recommendation for moss on trutone slate roof? Would Chloras be too severe???

Plumbthedepths

Baoithin66 wrote: »

any recommendation for moss on trutone slate roof? Would Chloras be too severe???

Jeyes fluid diluted in water and spray it on. Couple of days moss will die easily brushed off.

David Ward

THANK YOU FROM DAVID & ORLA AT RED GABLE CLEANING!!!

We work NATIONWIDE and we are happy to give FREE ADVICE.

Power washing and bleaching makes the walls, paths and tarmac more porous and weakens the substrate.
Washing powder will burn the moss but you haven't killed the problem and again it will make the tarmac fade and remove the oils.

We use a professional biocide and we always recommend maintenance depending on the substrate.

We give 100% guarantee and most importantly we DO NO HARM!

Word of mouth is our biggest advert so thank you again for recommending us.
David and Orla
Red Gable Cleaning and Rooftex(dot ie)

twowheelsonly wrote: »

A crowd called 'Red Gable Cleaning' (I think..) seem to be the people to talk to on this. I've never had this problem but plenty do including my brother. Power washing is only a waste of time and effort as are bleaches etc. They did his place and while it made a nice difference straight away it was in the following weeks that it really improved as the algae died off.

As far as I know they're Longford based but I'll see if I can find a link for them.


EDIT: Found them !!