Red effervesence... ???

sydthebeat

Has anyone here every come across a rendered capped concrete block wall that has a very prominent red 'effervesence' type staining??? It appears to have a very similar consistancy as rust...

Ill post pictures soon...

thanks for any help in advance...

http://i48.photobucket.com/albums/f242/sydthebeat/PICT0168.jpg

http://i48.photobucket.com/albums/f242/sydthebeat/PICT0169.jpg

http://i48.photobucket.com/albums/f242/sydthebeat/PICT0170.jpg

http://i48.photobucket.com/albums/f242/sydthebeat/PICT0171.jpg

http://i48.photobucket.com/albums/f242/sydthebeat/PICT0172.jpg

http://i48.photobucket.com/albums/f242/sydthebeat/PICT0173.jpg

smashey

I might have. I'll be able to tell from the pictures.

Slig

I have seen something similar on rendered walls in exposed sites. I heard it was a type of fungal growth but I dont know

reilig

Yes,

That is just a simple fungus. It occurs a lot on walls that haven't been painted. It also happens quite a bit on that white dash. It is easy to treat with a product available from hardware or DIY stores called "Moss Co" or "Moss Treat", just tell them what its for and they will give you the stuff which has to be sprayed or painted on and then powerwashed off after a few days.

Regards

Dan

foamcutter

Dan, thanks for the info.
My dad's house was rendered in white sand & cement with marble chips and badly stained (as in the photo) nice to know it's a reasonably easy remedy. We thought that it could have been some reaction with sand just coming out now.
Cheers

sydthebeat

thanks Dan..... much appreciated.

Yes, i can see now that the growth is towards the top of the wall and the staining seems to be rainwater pouring over it...

reilig

foamcutter wrote: »

Dan, thanks for the info.
My dad's house was rendered in white sand & cement with marble chips and badly stained (as in the photo) nice to know it's a reasonably easy remedy. We thought that it could have been some reaction with sand just coming out now.
Cheers

Many people think its the sand quality that brings out the redness, but in fact it is a fungus. Its usually worse if there's any drip from the gutters which runs down the walls. I cleaned a similar dash to that of your dad's last year with this stuff. It was a tough enough job and took a while but the Moss Co did a good job on it. I had cleaned it a couple of times before and it never came out right. The Moss Co is a type of strong bleach, dash comes out nice and white when it is powerwashed off. As I said above, its also quite common on plastered walls that aren't painted. (I presume the paint seals it and prevents the moss from growing.

Best of luck

Dan

Mellor

Yeah, its a fungus growth,
And as noted, it is worse in damp areas, the fungus needed water to grow/live.
It is also worse depending on orientation, I have a feeling it grows more on north facing walls, in the shade.

Quazzie

I've noticed this in my are too(east offaly) but contrary to Mellor it only seems to happen on South and East facing walls.

muffler

It is a fungus but I have also heard another theory though. A few people would argue that its an airborne oxide that emanates from bog land.

Quazzie

Well I live practically in the bog so the latter theory is always one that we have used ourselves, but then again we are just boggers who blame everything bad on the bog :L

Mellor

muffler wrote: »

It is a fungus but I have also heard another theory though. A few people would argue that its an airborne oxide that emanates from bog land.

There likely a number of reasons, each producing a different fungus or stain. Its certainly not bog related in Dublin, although alot of stone and older brick building has a dark stain on it cause of air-bourne pollutants, can't remember the exact name now.