Please DO NOT USE HYDROFLUORIC ACID.
That is truly evil stuff. Leave it to the glass etchers and other highly specialized and trained users. The potential consequences of mishandling are horrific.
If you must use acid use HCl - HydroCHLORIC Acid. That's what builders merchants sell as brick cleaning acid and that has severe enough consequences if mishandled.
youve had a top end rebuild on the property
its rear but building sites dont buy end of line stock
but theres a difference between the perps and the layering of the bricks between the layers this also tells me another builder has built it
Nonsense. It's just a "bad" batch of brick. Probably overheated in the kiln and formed a different surface finish. Same type of brick, it is interspersed with the similar regular type. They should have mixed them up more to be more random and lose the "line".
wrong differnt type of brick used
zoom in on the pic the brick profile dosnt match to each other
and that brick on the bottem ive dealt with as had to buy some old but new bricks the same to match the garage that i just built
Acid cleaning wont sort the difference in the bricks, and there is no need whatsoever to use or even contemplate hydroflouric acid.... it is a dangerous chemical and its "flesh eating " reputation is the least of the issues with it. Hydrochloric acid is more than good enough but is only useful to remove deposits, typically cement. It won't help the efflorescence and will only remove it short term.
Your options are professional tinting, refacing with a brick slip (matclad or similar, not from a diy outlet), render, clad or rebuild
The efflorescence is caused my damp, probably find the brick is a little too porus for your location if others are also finding it a problem. Assuming the dpc is ok.it needs checking with a damp meter on several occasions.
Acid cleaning wont sort the difference in the bricks, and there is no need whatsoever to use or even contemplate hydroflouric acid.... it is a dangerous chemical and its "flesh eating " reputation is the least of the issues with it. Hydrochloric acid is more than good enough but is only useful to remove deposits, typically cement. It won't help the efflorescence and will only remove it short term.
Your options are professional tinting, refacing with a brick slip (matclad or similar, not from a diy outlet), render, clad or rebuild
The efflorescence is caused my damp, probably find the brick is a little too porus for your location if others are also finding it a problem. Assuming the dpc is ok.it needs checking with a damp meter on several occasions.
The ‘salt’ only appears on the front, south facing wall of the house, nothing on the sides, or rear, which is the same brick. Same with the neighbours houses.
No damp discovered at all during the structural survey.
id just live with it colourwise .painting or coating brickwork means maintenance and cost
yep and the hod carrier should of mixed them in for the brickies...typical site work of that era,bet it was pissin down and they just cracked onThose are all the same type of bricks, just that the darker ones were nearer the heat in the kilns, this alters the colour, density and porosity, giving rise to the salts on the lower surface.
In the first pic, by the look of the messier pointing of lower darker ones, they may have been laid when wet or in the rain, which would start the salts problem off.
For high class work there is a set procedure for mixing bricks from different pallets when bumping out to blend them properly. No one bothered that day!
I still have a chart somewhere that shows the method.
edit, found it, book's been on a dusty shelf for long long a while!
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