Grouting over top of existing grout?


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Old 07-16-17, 09:51 PM
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Grouting over top of existing grout?

I used a center punch to scrape the surface of some existing 1/4" grout in a bathroom. I just roughed it up enough to get the dirty, dark grout surface off. Then I vacuumed up, then applied new grout. In about at week I was going to apply water proofing.
Is it advisable to do this or will it start to chip off?
 
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Old 07-17-17, 02:36 AM
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It would have been better to remove more of the grout so the new grout would be deeper/thicker .... but what's done is done so I'd be inclined to leave it and pray for the best. What type of water proofing do you intend to use? grout sealer?
 
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Old 07-17-17, 01:09 PM
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I have some sort of waterproof grout sealer.
 
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Old 07-17-17, 01:14 PM
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Not the way I think it should have been done but at this point run with it and hope for the best.
 
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Old 07-25-17, 12:37 AM
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I wound up buying one of these
Oatey 2 in. to 3 in. PVC Shower Low Profile Square Drain-42237 - The Home Depot
I'm using just the square chrome strainer and the plastic part that it's attached to. It has threads to screw into the bottom piece but it fits snugly when I simply insert it into the drain. I'll just use silicone sealer where it meets the new tiles I'm installing.
 
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Old 07-25-17, 08:53 AM
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That's not gonna do it. It is guaranteed to leak. I saw your other thread in the plumbing forum. Czizzi gave you the correct advice. Waterproofing of a shower is not done at the surface of the tile. Tile and grout aren't "waterproof". The waterproofing is done below the surface of the tile and below the mud. The drain you bought is a clamping drain and it integrates with a shower pan liner system to make it waterproof. Silicone at the surface will do nothing to make the pan waterproof. You have a tear-out to do. Here's a link to proper shower construction with that type of drain.

https://www.oatey.com/ASSETS/DOCUMEN...erpanliner.pdf
 
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Old 07-25-17, 04:11 PM
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There's already an existing installation of tiles that I'm installing on top of.
 
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Old 07-26-17, 06:43 AM
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Please re-read Johnny's post, I do not think he misunderstood what you are saying, I think you misunderstood him.
 
 

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