New answers tagged masonry
The bigger of aesthetics and structure is structure. Patching the surface with concrete doesn't address it. The items which need to be addressed are: Bulk water management. Adequate foundation to remedy decay caused by bulk water in the past. Replacement of the stone block with a new structural element, either properly constructed reinforced concrete or ...
My house was built in the 1880s and has a stone foundation, mostly sand stone. The best fix for situations like this I have found is building a form and packing in stiff cement and as large of pieces of the original rock as I can get. If you do the form in a couple layers (say using a 2x4 or 2x6, the long way). Let the cement s set around 24 hours and brush ...
If it is mortar marking (and it looks like it is), you should be able to get it off with brick acid (hydrochloric acid) and a wire brush. It's pretty nasty stuff though, so be sure to wear suitable safety equipment. If the marking is efflorescence (salts coming out of the brickwork) brick acid won't always take that off the faces of the bricks.
There is a product called Sure Klean® that is used nowadays. I am sure there are other brands out there too. Muriatic acid used to be used, at least it was when I was a masons helper, but I think Its availability is regulated. Sure-Klean has it, just in small amounts I guess. It needs to be diluted and protection worn, it pretty caustic stuff, so read the ...
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