Ceramic Tile Advice Forums - John Bridge Ceramic Tile

Welcome to John Bridge / Tile Your World, the friendliest DIY Forum on the Internet

Advertiser Directory
JohnBridge.com Home
Buy John Bridge's Books

Go Back   Ceramic Tile Advice Forums - John Bridge Ceramic Tile > Tile & Stone Forums > Tile Forum/Advice Board


Thread Tools Search this Thread
Unread 05-20-2022, 09:09 PM   #1
Registered User
Join Date: May 2022
Posts: 1
Filling between gypsum greenboard & permabase cement board?

Hi all, hoping to get some advice. Partially through repairing a failed shower pan/curb, previous contractor had glued tile directly on wood around the shower opening/curb and glued tile to greenboard on the shower walls. I've replaced the bottom 20 inches of the shower wall and encased the opening/curb with permabase plus. What can I use to fill in the inch or so gap between the gypsum greenboard and the permabase as in the pictures?

My plan to is to apply liquid waterproofing (redgard/aquadefense) and fabric waterproofing (corners/seams/etc.) over the permabase, existing greenboard and whatever I use to patch the gap between the greenboard and permabase.

Since this is in the shower, drywall compound is not going to work. I'm thinking either thinset or expanding foam under mesh tape (Great Stuff Gaps & Cracks). I'm leaning toward Aquadefense over Redgard because it's got gypsum listed on it's TDS, and Great Stuff instead of thinset to fill the gaps.
Attached Images

Last edited by tileywiley; 05-20-2022 at 09:15 PM.
tileywiley is offline   Reply With Quote
Sponsored Links
Unread 05-20-2022, 09:51 PM   #2
Moderator emeritus
cx's Avatar
Join Date: Jul 2001
Location: Boerne, Texas
Posts: 96,424
Welcome. Please put a first name in your permanent signature line for use to use.

So long as you understand that what you're doing is nothing more than a temporary patch until you're ready to replace that shower, I suppose you could do something like what you've got in mind. Won't meet code, nor does it comply with the ceramic tile industry standards.

You'll wanna look at the TDS for that AquaDefense again, too. You'll note under "Interior Only" it says "Gypsum wallboard (walls only, in approved application
areas only)." Yours would not be one of the approved applications.

You can certainly use it if you want, but you're very far from any recognized method of constructing, or repairing, a residential shower.

What you need to do is replace that shower. You might buy a little time with your repair, but it won't be a lot.

My opinion; worth price charged.

cx is offline   Reply With Quote

Stonetooling.com   Tile-Assn.com   National Gypsum Permabase

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Kerdi Board - Cement Board - Gypsum? PaulEdmonton Tile Forum/Advice Board 7 03-03-2013 07:35 AM
greenboard or cement board for tile shower ceiling maljeff Tile Forum/Advice Board 6 08-22-2012 09:57 AM
Permabase Cement Board Tucker3878 Tile Forum/Advice Board 99 03-14-2011 08:36 AM
Non-wet area with greenboard or cement board? cjensen63 Tile Forum/Advice Board 6 01-30-2011 07:27 PM
greenboard or cement board bryce1011 Tile Forum/Advice Board 12 04-20-2010 10:27 AM

All times are GMT -6. The time now is 04:19 AM.


Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2023, Jelsoft Enterprises Ltd.
Copyright 2018 John Bridge & Associates, LLC