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Anyone ever clean a stone roof?

I haven't checked it out but the customer says its stone not slate. 

I imagine the standard roof mix would work just fine.

Any thoughts?

Thanks in advance.



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Checked out the roof today and it's not stone.

More like these above.

Possibly reclaimed French Flat roof tiles.

Looks like these things will soak up the mix like a sponge.

Maybe you FL guys have seen these but here in the north east not so much.

I'm still thinking standard mix but I think I'll do a test area first. 

Any tips for this.


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It will cleanup just like every other roof cleans up. You will probably need at least 40% and maybe 50% ratio to get it clean and might have to hit some of it more than once but it will work. I would tell the owner the algae stains will be gone when you leave but the lichen will still be there but not very noticeable and dead as a hammer. It will decay and weather off in a few weeks. 

Also, don’t be surprised if those tiles “bleed” color when you clean them. It won’t hurt anything but might scare you if it happens. 

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