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Old 05-19-2009, 07:58 AM   #1
Daron Farrar
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Re-grouting Shower Floors

I was wondering if it is safe to use an osciallting tool with a grout blade to remove grout on a shower floor or is there too much risk of damaging the waterproof membrane underneith?
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Old 05-19-2009, 08:21 AM   #2
TileArt1
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Hey Daron,

What type of waterproof membrane do you have? If it's Kerdi or Redgard or another membrane to which the tile is adhered there is a chance of damaging it. If you have just a regular mudbed installation with the tile adhered to the mudbed over a liner it's no problem at all.
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Old 05-19-2009, 02:04 PM   #3
Daron Farrar
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Thank you for the reply, I am not sure what kind membrane has been installed. Is there a way to determine where it is and what kind and if it is safe to use mechanical tools?
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Old 05-19-2009, 02:34 PM   #4
TileArt1
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Sure, get a grout saw and slowly remove some grout from one of your lines. Carefully remove it all the way down to your substrate. You want to remove enough to see what is beneath the thinset. If you start seeing strange colors like kerdi orange, laticrete green, blue, anything but gray or white STOP - that is your liner and no you should not use power tools. (I don't believe I've ever said that phrase to anyone - ever ). If you start to get to a lighter, sandy gray that is more than likely your mud bed. You should be fine at that point.
Basically if you have a regular mud bed it should be about 1" thick beneath your tiles so you're fine. If your floor tiles are installed directly to the liner such as kerdi, 9235, etc. you don't want to risk puncturing it.

This is all, of course, unless you have the walls torn off in which case you can just look behind them and see what is there.
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Old 05-19-2009, 02:41 PM   #5
Daron Farrar
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Thanks for your help Roger, thats a good idea to remove one grout line to take a peak at it and go from there. Have a good one.- Daron
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