Black aligned dots on brickwork

[^woody^]

For a two year old new build, the builders did a great job of making it look over 100 years old.

Is it timber framed? North facing? Just on that elevation?

 

[Nige F]

someone had a genny running on the scaffold ? moved along

 

[Deleted member 174758]

someone had a genny running on the scaffold ? moved along

That would look just like a monster truck exhaust, too!

 

[ARevell]

For a two year old new build, the builders did a great job of making it look over 100 years old.

Is it timber framed? North facing? Just on that elevation?

Wall is SW facing and yes, the rust/spots are only on this wall elevation. It’s been a couple of months since but no new spots have appeared, nor have the current spots increased in size.

 

[freddiemercurystwin]

are they within your garden or public area ??
do they brush off easilly ??
Thinking candles/soot mischief /boredom ??

 

[ARevell]

Within private garden, stain won’t brush off easily.

 

[Deleted member 174758]

Just out of intetest, OP, have you tried oxallic acid (bought as crystals from the pharmacy, finishing houses, deco centres and even Amazon and added to water) on one spot? If it is carbon it won't have an effect - if it is iron based it should disappear or at least be reduced in intensity

 

[Deleted member 174758]

I reckon you should be OK. If you hit blavk plastic then the DPM is too high - any other services should be deeper in any case

 

[ARevell]

Just out of intetest, OP, have you tried oxallic acid (bought as crystals from the pharmacy, finishing houses, deco centres and even Amazon and added to water) on one spot? If it is carbon it won't have an effect - if it is iron based it should disappear or at least be reduced in intensity

Thanks for the idea, will try this over the coming days.

 

[ARevell]

I have also tried involving the NHBC, but they have no interest whatsoever.

Informed me they do not cover preventative repairs or potential damage