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Old 03-18-2013, 08:23 AM   #1
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How much mortar to remove


I'm using the Kerdi membrane in a shower renovation. I'm using Ditra unmodified mortar and Hardi backer. The first 2 pieces of Kerdi I put up didn't hold well because I didn't wet the backerboard enough. I've removed the Kerdi. Question is how much mortar do I have to remove for rehanging the Kerdi? Do I need to scrape down to the backerboard if it is adhering well?

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Old 03-18-2013, 09:09 AM   #2
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How much mortar to remove


How much mortar (square footage) did you put up?

If it isn't much, I would remove it and get back down to the back board.

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Old 03-18-2013, 09:32 AM   #3
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How much mortar to remove


It's about 36 square feet of coverage. What would you suggest- a scraper and sander?
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Old 03-18-2013, 10:16 AM   #4
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How much mortar to remove


Scraper.

You don't want to be breathing in mortar dust. Not good for the lung health with the portland and/or silica.
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Old 03-18-2013, 10:54 AM   #5
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How much mortar to remove


Ditto on the scraper. You don't want to be breathing CBU dust either.

How much effort did it take to pull it off?
I've never used Kerdi, but I suggest doing a bit more research. My understanding is even if done properly, it will be fairly easy to pull off. You may be fine the way you were doing it.
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Old 03-18-2013, 01:47 PM   #6
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How much mortar to remove


A scraper will work fine but I'd turn to my Fein MultiMaster with a blade made for removing mortar. My oscillating tool has become my favorite go-to tool. And prices for less expensive models are really reasonable.
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Old 03-18-2013, 07:32 PM   #7
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How much mortar to remove


It's not coming off very easily. I think I'm going to do a redo with some of it still adhering. I'm not going to get it all down to the backerboard.
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Old 03-18-2013, 09:09 PM   #8
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How much mortar to remove


its been a few years sinse i used kerdi. but back then they said to only use regular drywall.

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