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Old 01-12-2018, 05:59 AM   #1
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Sealing shower pan from Hardie joint

Hey all, I am in search of some advise for sealing the shower pan from my Hardie Back board.
Here is my plan:
1. I will seal all joints with Mod. thinset and fiba tape.
2. I plan on red garding it with several coats (maybe 3 or 4).
3. I bought some Kerdi fix caulking; I was planning on caulking the "bejesus" out of that 1/8" gap where it meets the pan.
4. was going to let this dry and embed some Kerdi tape with MODIFIED versaflex mortar for additional waterproofing. If I do this can I then put redgard over the Kerdi tape and modified mortar? I know redgard won't stick to the kerdi fix caulk, but if it's covered with mortar it should stick, Correct?)

My question is: is this adequate to seal this area?
My other thought was to take the bottom Hardie board off and install some kind of flashing first. I just can't seem to find what to use for this. Any ideas for this?

Thanks for advise.
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Last edited by tdryan4; 01-12-2018 at 06:28 AM. Reason: shower pan
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Old 01-12-2018, 07:26 AM   #2
Shady at Best
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Fir out or shim the hardi backer out so that it can be installed over the lip of the pan. Tape the seams with an alkali resistant tape, use thinset as your taping compound. Then cover the whole thing in a few coats of redgard. Redgard needs to be a certain thickness to be waterproof. It will say how thick on the bucket of redgard.

Modified thinset is not waterproof.

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Old 01-12-2018, 10:47 AM   #3
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Welcome, Tim.

Not sure what you mean by "Kerdi tape," but I would recommend you use Kerdi Band (or similar) and attach it to the tiling flange of your receptor with Kerdi Fix and to your wallboard with thinset mortar per the Kerdi manufacturer's instructions. You'll find your same application, albeit with a tub, in the online version of the Kerdi Shower System Installation Handbook available on the Kerdi website.

I wouldn't advise caulking the gap between wallboard and receptor at all.

I would recommend you use Kerdi to waterproof the walls if you use Kerdi Band for the wall/receptor junction, but the RedGard will work. You'll not benefit from any warranty that way, though.

My opinion; worth price charged.

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