Hello everyone!
How can hard, dry plaster residue be removed from sandstone? These are sandstone blocks of a garden wall.
By the way, I'm struggling to come up with more lines (to reach 200 characters), even though I believe I have already asked my fairly straightforward question. Thank you very much!
Regards,
Mike
How can hard, dry plaster residue be removed from sandstone? These are sandstone blocks of a garden wall.
By the way, I'm struggling to come up with more lines (to reach 200 characters), even though I believe I have already asked my fairly straightforward question. Thank you very much!
Regards,
Mike
M
motorradsilke8 Dec 2021 17:04tomtom79 schrieb:
Who built this wall? I would even guess that the wrong mortar was used. I think so too. It looks more like efflorescence. The only solution is demolition and rebuilding with the correct mortar—if at all.
These are not efflorescence stains. The mortar was applied too wet and not handled carefully.
When filling joints, the mortar is usually mixed to a damp consistency, then applied, and afterward the surface is swept with a hand brush to finish.
This cement residue (cement haze) is very difficult to remove. I would first try water, a stiff brush, and maybe carefully use a pressure washer. Depending on the situation, you could also try a sanding sponge.
This will improve the appearance but won’t make it perfectly clean.
You can try many methods, but you have to experiment yourself. Cement haze removers can also help, but use them cautiously and specifically. If nothing works after the first cleaning and your aesthetic expectations are high, consider applying a glaze or wash. We usually make these ourselves; for example, KEIM paints offer suitable glazes. However, some experience with color is recommended.
When filling joints, the mortar is usually mixed to a damp consistency, then applied, and afterward the surface is swept with a hand brush to finish.
This cement residue (cement haze) is very difficult to remove. I would first try water, a stiff brush, and maybe carefully use a pressure washer. Depending on the situation, you could also try a sanding sponge.
This will improve the appearance but won’t make it perfectly clean.
You can try many methods, but you have to experiment yourself. Cement haze removers can also help, but use them cautiously and specifically. If nothing works after the first cleaning and your aesthetic expectations are high, consider applying a glaze or wash. We usually make these ourselves; for example, KEIM paints offer suitable glazes. However, some experience with color is recommended.
tomtom79 schrieb:
Who built this wall? I would even guess that the wrong mortar was used.It was a landscaper who, unfortunately, doesn’t seem to have much experience with masonry!
Who normally carries out such work properly and neatly? A bricklayer? If you know someone working in the Pforzheim area (Karlsruhe - Stuttgart), please get in touch!!!
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