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Unread 03-12-2012, 10:44 AM   #1
Higher Standard Tile
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Mildew on exterior Travertine

A client called me to look at a restoration job.

Exterior travertine. Was mud set over concrete slab (i know who the stone contractor was).

Chiseled edge material all surface holes where left unfilled as requested by client. Same stone looks great on interior floors and exterior areas that get plenty of sunlight. But the shady areas look like this. She is planning to hire a company to clean and seal it, but use me to grout all the surface holes after cleaning and before sealing.

She also asked if I want to seal it. I know how to. But would even a top of the line sealer help prevent the mildew from coming back?

I told her that filling holes with grout and sealing would make it easier to keep clean but that regular cleaning will still be required. Any comments?
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Unread 03-12-2012, 03:40 PM   #2
Davestone
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I think you pretty well covered it,in fact it will be tough to get it clean without a lot of work.
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Unread 03-14-2012, 10:39 AM   #3
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You may waant to give Liquid Poultice from Mireacle a shot to try and pull that stuff out of the open holes.
Now it won't prevent it from occurring, but may be able to get it clean for you.

Robb
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Unread 03-14-2012, 10:13 PM   #4
doitright
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Hi Isaac

I suggest applying D/2 prior to cleaning. The D/2 must be applied to a dry surface for it to be effective. Follow with a high alkaline wash and rinse. Follow with a pressure washer fitted with a spinner attachment. Let dry, grout, and seal after 72 hours.

The patio should be treated with D/2 annually, and cleaned annually (minimally).
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Unread 04-01-2012, 09:05 PM   #5
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So the client hired a cleaning company to come out and power wash the stone. Took a crew of 3 men 9 hours to get about 2000 sqft clean. They did use some special mildew cleaner but not sure what it was.

We came in a couple of days later and grouted the pits with Permacolor and then sealed with Stonetech Heavy Duty Exterior Sealer.

They do know that it will have to cleaned regularly. Any more details on this D/2 cleaner John?
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Unread 04-01-2012, 10:01 PM   #6
doitright
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Hi Isaac

Wow! I've done 5,000 feet in 4 hours with a crew of 2. They must of had a tough time.

Here's a link to the D/2 Biological Solution.
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Unread 04-04-2012, 12:24 AM   #7
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Thanks John. I'll recommend that use that when the problem starts to come back.

The cleaning company used a power washer. Not sure what cleaning chemicals they used.

I wonder if a floor machine would have been faster?
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Unread 04-04-2012, 05:41 AM   #8
doitright
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Hi Isaac

Many times it requires a combination of equipment and chemicals.
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Unread 04-12-2012, 04:21 PM   #9
stonesandfloors
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Hi Isaac,

Since problem has been solved already. I just want to add some ideas for your future jobs.
As you told this material is unfilled and it is realy difficult to keep dirt away from little natural holes. Grouting it is very good idea. And sealing will help to keep it clean. At least it will prevent to dirt or spill to penetrate into the stone. Stonetech Heavy duty is what we recommend to our customers all the time.

We have finished a job just like yours it was smaller though about 1300 SF of french pattern travertine. Contractor didn't grout it so it get dirty as in the photo of yours. We have used Muriatic acid to clean all the dirt and wash it off with pressure washer. That worked just fine.
Just keep it in mind as another option. Of course I am only talking about travertine.
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