Stained render

Question

What's causing the black staining on my render?

Keith · Answer

Well it could be a number of things.
 Is wall getting very wet and not able to dry out?

Worrel · Answer

If u are facing the road ,build up off carbon, leak from guttering, infused with algae, one would need to c to give final judgment.

Charlie · Answer

Could be a number of reasons, possibly carbon stains, water stains, algae/fungus

Iain · Answer

Hello 
A photo would help but any of what the last roofer said.
Regards Iain

Ryan · Answer

That is a fungacide in the algae growing in your tender and fungacidal cleaner/bleach will clean it

Roy · Answer

Black marks on render usually stars from algae which form from bird crap it can be removed with rendering cleaner soft wash and a pressure steam wash the black marks appear after 5 to 7 years after rendering more common on render that has not been painted but this may only happen on some properties on on all

Craig · Answer

Hard to tell without pictures but i would agree it will probably be a build up of carbon/ algie or guttering problem also depends on what is around the effected area.

Russell · Answer

Its probably mould if inside or  waterstaining from  dripping or  trickling water from  dirty roof tiles or guttering .water that runs off of lead roofs or flatt roofs also shed dirty watet down walls   .interior mould can be  cleaned with bleach wich kills the spores .exterior  keep gutters clean of debris and moss and make sure the dont leak

Curby · Answer

Could be fungus , mold can you not put any pictures on this so we can look at it

Lewis · Answer

Over years old Roughcast will build up black stain

Stained render

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