It seems that no matter how careful I am , I manage to get some mortar on
the face of the stone I'm putting up behind my wood stove . In the past I've
used vinegar to cut the haze left on ceramic tile from grouting , but
vinegar isn't doing that well on the stonework . I've seen muriatic acid
used to clean up bricks , and wondered if it'll work as well on what I'm
doing . I know rubber gloves and really good ventilation are going to be
necessary , probably wouldn't hurt to wear a rubber/plastic apron in case I
splash . How long does the mortar need to set up before I can wash it
without cutting the mortar between the rocks ? I assume mixing directions
will be on the package .
I'd leave it on for a few hours, and then take MOST of the mortar off
the stones with the kind of brush used to clean dentures or any other
stiff nylon bristle brush. (Denture brushes have very much stiffer
bristles than tooth brushes, which is what you need for that job.)
Brick mortar takes a while to harden, and while it's hardening, you can
remove it relatively easily with a stiff bristle brush, paint scraper,
putty knife or whatever. For the first day or two, your brick mortar
will be easy to remove by mechanical methods.
You can always removed hardened mortar with muriatic acid, but I'd
dilute the acid with water. Always pour acid into water, never the
other way around. Make your acid solution stronger by adding acid until
it removes the hardened mortar easily.
Many new construction materials (like brick mortar, fresh plaster or
concrete) have hydrated lime in them that makes them highly alkaline
when they're new. Over a year or two that lime reacts with the CO2 in
the air to form limestone (calcium carbonate), but within the first one
or two years, highly alkaline materials like that will dissolve much
more readily in acid than a much more stable material like rock or
But, within the first few hours, you'll find you can pretty well remove
brick mortar just by rubbing it with your finger. And, within the first
few days, a wire brush will take it off quick and easy.
I waited after I laid up a section until the mortar was set up enough that
the stone didn't move if you pushed lightly , then cut it back between the
rocks . I then brushed it smooth with a stiff brush , so it already has the
finish I wanted . I just need to remove the "haze" left on the edges and
edge of the face . I'm letting each section dry about 24 hours before I lay
another course on top of it - I don't want to do this twice . Brick ties are
about every foot or so , screwed to the studs . I think it's looking pretty
good , just wish I could convince my wife that 1/4" mortar joints in stone
work ain't gonna happen ...
I just finished building a mortared stone retaining wall, using standard
mortar mix I picked up at Home Depot.
I picked up a bottle of muriatic acid at Home Depot (in the paint
department), and mixed it about 50/50 with water in a spray bottle. I
sprayed it on, let it sit for 3 to 5 minutes until it stopped reacting with
the mortar, then hosed the residue. It worked great for me, but I'm not
sure how you would handle this indoors. Maybe a spray bottle with water and
sponges to clean up the run off?
Oh, and my mortar varied from 24 hours to a few weeks old and it worked
fine on both situations.
Thanks ! Turns out the situation isn't as bad as the floor was . I've
apparently been getting most of it off as I brush finish the joints aafter
I cut them down belowe the rock face . I'll still need to do some cleanup ,
but not as much as I'd feared .
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