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Old 11-21-2014, 05:23 PM   #1
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How to remove hardibacker mortar


Start of a bad installation for porcelain wood planks, laid 200 sq ft of 1/4" hardibacker in bed of super modified, poly mortar over existing 5/8" OBS sub.

Removed boards, but how do I remove mortar? I have scraped it and it breaks up ilke sand and powder, but I also wet it and it reverts back to mud state which seems easier,

How clean does this now have to be in order to apply plywood, as I will never be able to clean it back to state it was in prior?

Thanks so much.

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Old 11-21-2014, 06:30 PM   #2
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How to remove hardibacker mortar


Scrape and vacuum--you will never get the floor to look like new wood---

A Diamond cup wheel is some times used--but the dust is awful----
How thick is the new plywood going to be?

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Old 11-22-2014, 08:24 AM   #3
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How to remove hardibacker mortar


I was advised to apply 1/2" or 5/8", should this be T&G ? and what type,grade?

I know it has to be laid perpendicular to joists but how ? What are the guideline for laying this second layer which now assume is treated as underlayment?

I will offset it from the pattern to the existing 5/8" OSB, and still perpendicular, but where is the ply placed directly centre of joists board or offset to middle of spacing between joists so t&g is starting between middle of joists?

What fasteners with 2" floor screws or nails? How far apart ?
Do I fasten to joists still or not and just thruout ? do I glue it down? (actually not likely as film of mortar will still be there)

Thanks so much,

Ann
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Old 11-22-2014, 08:41 AM   #4
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How to remove hardibacker mortar


dont know how to put location in profile, won't let me access it?
Ontario, Canada
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Old 11-22-2014, 08:41 AM   #5
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How to remove hardibacker mortar


Use BC plywood Exposure 1--(exterior glue)--butt to tight---no tongue and groove needed.

You will be stapling this down with a small crown stapler (1x4" by 1 1/2")

staples every 6 to 8 inches---do not attempt to hit the floor joists, it is best if the underlayment is only attached to the existing subfloor---
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Old 11-22-2014, 08:44 AM   #6
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How to remove hardibacker mortar


Don't worry about the location---but if you wish to add it--go to the task bar and click on 'use CP'---if that doesn't work---let me know (I'm a moderator) and I'll pass the problem on to the big computer guru.
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Old 11-22-2014, 10:05 AM   #7
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How to remove hardibacker mortar


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Originally Posted by annjil View Post
Start of a bad installation for porcelain wood planks, laid 200 sq ft of 1/4" hardibacker in bed of super modified, poly mortar over existing 5/8" OBS sub.

Removed boards, but how do I remove mortar? I have scraped it and it breaks up ilke sand and powder, but I also wet it and it reverts back to mud state which seems easier,

How clean does this now have to be in order to apply plywood, as I will never be able to clean it back to state it was in prior?

Thanks so much.
Why did you lay the hardi backer in mortar? You just screw in down. Then put the thin set on then tile then grout.
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Old 11-22-2014, 12:40 PM   #8
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How to remove hardibacker mortar


You referred to installation of hardibacker:

Hardibacker website manual instructions are to set in mortar, then screw down.

Reason for tearout is Pro installer did not check for any floor deflection, nor did he bother to repair the 5/8" OSB subfloor nor apply plywood for stiffness Result problem continued.
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Old 11-22-2014, 12:49 PM   #9
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How to remove hardibacker mortar


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Why did you lay the hardi backer in mortar? You just screw in down. Then put the thin set on then tile then grout.
ALL cement backer boards MUST BE INSTALLED IN THINSET when preparing for a tile installation.

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