Limestone patina?

Out here cleaning the windows on this 30,000 sq ft monster. I go to the back, and there are some “stone” guys spraying outdoor bleach from a spray bottle onto the staining areas of the stone, and using a small hand held brush. It isn’t cleaning anything at all. Says there isn’t much you can do to remove and prevent the patina of the limestone. Says they installed it all, but since it’s a high profile account, they want to take care of the “cleaning” part, too.

Does limestone patina? Isn’t there a better and more efficient way to clean this and keep it clean?

Here is part of the so called patina.

What you show is not patina. Patina is the change that occurs to the surface of the stone as time and exposure tighten the surface that was created during fabrication.

What you show is staining. Typically caused by airborne pollutants that react with the stone itself. It shows itself in this unattractive manner because it is being fed and aggravated by water that is allowed to run over the face by improper architectural detail specifications and/or construction details.

You are correct to question the crews methods, knowledge and efforts. There is typically nothing good about salt water on the soft limestone that you picture.

I’ll post some more pics, but would you say something to the home owner?

Absolutely. Educate yourself and them take the work, and upsell a seal job too

This guy says he is a stone expert, and installed all the stone, yet is using a toothbrush to clean it. Says sealing will not work.

Sure, give me their number and the best time to call. :slight_smile:

Is this the big job with tight deadlines? Perhaps another time would be better to discuss this with the client with just a mention at this time. From what I can tell from the one pic that you posted, this staining is addressable but will only get worse with continued wet/heat cycles. It may not always get worse appearing so much as deeper set and increasingly difficult to remove.

This is what I like to call “restoration grade cleaning”.

Yes, tight deadline of Friday. Former Tulsa mayor, but running again. Fundraiser next weekend. I’ll wait until after the event, especially since I won’t have time to address it myself.

Sad. I like to learn from experts. I believe that this expert can teach me what not to do.

Does this look like wand marks to you? There are a few spots throughout the home where these are noticeable.

Yeah it does. Looks like a red tip

We have exited sad territory and are approaching criminal. Stop The Abuse. Take that mans wand away.

I believe that you may be dealing with Indiana limestone which is much different than the denser limestone that we see around the Maryland area.

I’m just assuming it’s limestone. Maybe I’m wrong. Looks like it.

The more I look at the stone, the more wand marks I see. All over the house. Such a shame. Any way of removing them? I would imagine not.

Probably not. I assume that this stone surface is not polished but more of a sandpaper type feel? Wand marks are really just accelerated wear. You can’t undo that. The only thing that you could do would be to abuse the surrounding surface so it was all abused somewhat evenly. Not a good plan.

I know that you are on site with a focus on other things, but if it took a while for these to come to your attention, it is possible that the owner is not aware of them or perhaps not bothered by them. I would document the abused areas well but would not make an issue of them unless necessary.

I appreciate your help. Always good advice.

Talking to the guy who is scrubbing the limestone with a brush and spray bottle of bleach. Apparently those wand marks are fresh. The guy who hired the guy I’ve been chatting with, tore it up last week, and now hasn’t been seen since. Unfortunate.