View Full Version : Pennsylvania Blue Mortar Removal

09-16-2008, 02:36 PM
Hey guys,

I subbed out a job to the mason that did the stonework on my house to lay a penn blue flagstone sidewalk for a customer we did a landscape project on. He left a little mortar on the face of the stones.

Whats the best way to remove this? I've got dwf mondo surrounding the stones, so I'm hesitant to use any chemicals.

Wire brush maybe? But that will probably scratch the face too much.


Summit L & D
09-17-2008, 12:34 AM
If the chunks are big enough to flake off, you might try a putty knife (maybe a plastic one would scratch less). Otherwise, it's most likely going to involve chemicals...like muratic acid.

I just remembered...a pressure washer might do the trick.

09-17-2008, 08:14 AM
k, ill give pressure washer a try, thx.

09-18-2008, 12:08 AM
Careful with a pressure washer......you may see just how well he did or did not do his joints.

Take a trowel, scrape/pop it off and finish with acid. Tell your guy next time to use a sponge. You can do the most beautiful and perfect job laying/setting stone but if your joints look like crap, it all looks like crap.

04-22-2009, 10:41 AM
I have the same problem--what did you end up doing that worked? Thanks!

04-22-2009, 01:15 PM
I had good luck with vanatrol the last time I had some excess mortar problems. But the directions state its only good for about a month after installation if I remember correctly, if it is older you might need something stronger.


04-29-2009, 10:01 PM
i had my mason use acid.

problem solved.

04-29-2009, 10:21 PM
Been setting flagstone for years.I set the stone,then come back and fill the joints with a grout bag,then joint and sponge every thing..makes for a clean job and seals all the joints.Never have to acid wash.Mason for 41 years...Bullet