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Unread 03-15-2020, 11:39 AM   #1
JHarbinson
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Hardi Not Adhering to Floor

I installed about 70 sq ft of 1/4" hardi on a bathroom floor as I have done on countless other jobs. Custom's VersaBond troweled over the 3/4" ply subfloor and screwed down all per manufacturer instructions. About a week after the hardi went down we started to notice in a couple of spots the Hardi had actually unbonded from the subfloor! Has anyone seen this before? Did I just get a super dry batch of Hardi and it sucked all the moisture out of the thinset?

I've honestly never had this happen over many years of the exact same installation method.
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Unread 03-15-2020, 11:47 AM   #2
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Difficult to say without a good deal more information on the installation, Justin, but keep in mind that the purpose of the thinset mortar in that application is not to bond the CBU to the subfloor, but only to provide a 100 percent footprint for the CBU panels. The mechanical fasteners hold it down, the mortar holds it up.

I'm curious to know how you determined that the CBU came "unbonded," though.

My opiinion; worth price charged.
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Unread 03-15-2020, 11:54 AM   #3
JHarbinson
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It's a pretty flat subfloor, in good shape, and not issues with deflection. The Hardi screws were set per instructions. The issue appears to be ain a couple of locations, the Hardi almost seems "bubbled" up from the subfloor. It's like a small area in between four screws in a square area for example has deflection as if it's not tight to the subfloor anymore. Very strange, never seen this before, and like I said, I've always done my floors the same way/materials and always had excellent results.
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Unread 03-15-2020, 12:58 PM   #4
Carbidetooth
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Sometimes this can happen with your screw down sequence. I always try to work from one side to the opposite side. Conceivably one could work from middle out to edges. Worst is from edges in, any excess mortar is kinda smooshed along into a hump.
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Unread 03-15-2020, 01:00 PM   #5
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I can't say I've seen it happen but given the comparative strata-like nature of Hardi, could it be a delamination?
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Unread 03-15-2020, 01:11 PM   #6
Lazarus
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Also possible that the morter was too firm. Should be fairly "loose." I also like to lightly sponge the boards just before putting them down. That Hardi is thirsty stuff...
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Unread 03-15-2020, 02:35 PM   #7
HS345
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I do like Laz, wipe the backs before placing. In addition to dampening them, there's always a bunch of dust on the sheets too.
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Unread 03-15-2020, 10:09 PM   #8
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A picture or two might be helpful.

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Unread 03-16-2020, 04:20 PM   #9
JHarbinson
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I did screw down starting in the middle and worked outward as always. I'm thinking it the "thirsty Hardi" issue as they are definitely dry. I've been dousing the Hardi sheets with lots of water now, so hopefully that will solve the issue. I've used Hardi for years and never had this issue. Perhaps they were stored in an extremely dry area? Going forward, I'm going to always wet down the boards ALOT.
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