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

Sponsors


Reply
Thread Tools Search this Thread
Unread 05-17-2019, 09:46 PM   #1
Anthocar
Registered User
 
Join Date: May 2019
Location: Austin, TX
Posts: 40
Deck Mud in Fiberglass Shower Pan

Hello,

I got into a situation where a handyman did a shower for me and ended up doing it wrong. I sent him on his way and had someone else take out the mortar and reinstall a preslope + custom fiberglass waterproofing. He told me I needed to find someone to do the mud bed, but after reading this and other forums, I feel relatively confident that I can do that part myself.

Is the process different with fiberglass as compared to other waterproofing method or can I just start building the mud bed?

Do I need to lay down some lath for the deck mud to grab on to?

Lastly, I've seen differing opinions on running cement board down to the mud bed. Some people leave a space to allow moisture to wick and other posts I have seen run cement board down to the slab and build the bud bed into that.

I havent seen much on fiberglass, I was looking around for a few hours. Pardon if this has already been asked.
__________________
AC
Anthocar is offline   Reply With Quote
Sponsored Links
Unread 05-18-2019, 05:22 AM   #2
Davy
Moderator -- Mud Man
 
Davy's Avatar
 
Join Date: Jan 2003
Location: Princeton,Tx.- Dallas area
Posts: 31,758
Hi AC, welcome. You'll need to explain or post a pic of your fiberglass pan. Is this a premade fiberglass pan that sets on the floor inside the shower or did he actually mix his own fiberglass and install it in place of a traditional PVC pan liner?
__________________
Davy

www.davystephenstile.com
Davy is offline   Reply With Quote
Unread 05-18-2019, 06:38 AM   #3
cx
Da Home Builder
 
cx's Avatar
 
Join Date: Jul 2001
Location: Boerne, Texas
Posts: 88,415
Welcome, AC.

And please put a geographic location in your User Profile so we can tell if you're in the People's Republic of Austin, Texas, where fiberglass rules for shower receptors.
__________________
CX

Y'ALL NEW VISITORS READ THIS HERE!
cx is online now   Reply With Quote
Unread 05-18-2019, 11:32 AM   #4
Anthocar
Registered User
 
Join Date: May 2019
Location: Austin, TX
Posts: 40
Thanks! Yep I'm in Austin. It wasn't a prefab, they made the finerglass pan on site. I'm gonna do water tests today. I'll snap a picture in a few.

Sent from my SM-N960U using Tapatalk
__________________
AC
Anthocar is offline   Reply With Quote
Unread 05-18-2019, 12:07 PM   #5
cx
Da Home Builder
 
cx's Avatar
 
Join Date: Jul 2001
Location: Boerne, Texas
Posts: 88,415
Quote:
Originally Posted by cx
And please put a geographic location in your User Profile
Or the information will be lost before we leave this page.

What method is being used for waterproofing the walls?
__________________
CX

Y'ALL NEW VISITORS READ THIS HERE!
cx is online now   Reply With Quote
Unread 05-18-2019, 12:24 PM   #6
Anthocar
Registered User
 
Join Date: May 2019
Location: Austin, TX
Posts: 40
Quote:
Originally Posted by cx View Post
Or the information will be lost before we leave this page.

What method is being used for waterproofing the walls?
NP, Ill do that as soon as I get back to my comp, I'm on my phone right now. I was gonna run cement board to the floor, tape and thinset the seams, lay the deck mud (above cement board) with proper slope, then redgard over the walls (2 coats)

Sent from my SM-N960U using Tapatalk
__________________
AC
Anthocar is offline   Reply With Quote
Unread 05-18-2019, 12:43 PM   #7
Anthocar
Registered User
 
Join Date: May 2019
Location: Austin, TX
Posts: 40
Here is a pic of the fiberglass they installed.

Sent from my SM-N960U using Tapatalk
__________________
AC
Anthocar is offline   Reply With Quote
Unread 05-18-2019, 01:25 PM   #8
cx
Da Home Builder
 
cx's Avatar
 
Join Date: Jul 2001
Location: Boerne, Texas
Posts: 88,415
You should already have the proper slope, AC. If not, you want to correct that.

What you want is a final mud bed of consistent thickness of at least 1 1/2 inches following the slope of your floor. You also want to protect the weep holes in your drain before installing the final mud bed, presuming the fiberglass people didn't already clog them, which would also need to be repaired.

Your wall plan is good, so long as you use a true CBU and not a Fiber/Cement board.

My opinion; worth price charged.
__________________
CX

Y'ALL NEW VISITORS READ THIS HERE!
cx is online now   Reply With Quote
Unread 05-18-2019, 01:56 PM   #9
Anthocar
Registered User
 
Join Date: May 2019
Location: Austin, TX
Posts: 40
Great. Thanks for the help. No lath in the fiberglass necessary then? P.S. using hardibacker for the walls

Sent from my SM-N960U using Tapatalk
__________________
AC
Anthocar is offline   Reply With Quote
Unread 05-18-2019, 02:06 PM   #10
cx
Da Home Builder
 
cx's Avatar
 
Join Date: Jul 2001
Location: Boerne, Texas
Posts: 88,415
You must not embed Hardiebacker into your final mud bed, AC. That's why I specified a true CBU, something meeting ASTM C-1325 testing requirements. Hardiebacker is a Fiber/Cement board.
Quote:
Originally Posted by AC
No lath in the fiberglass necessary then?
Don't understand the question. Your fiberglass is completed, is it not?

My opinion; worth price charged.
__________________
CX

Y'ALL NEW VISITORS READ THIS HERE!
cx is online now   Reply With Quote
Unread 05-18-2019, 03:02 PM   #11
Kman
Moderator
 
Kman's Avatar
 
Join Date: Nov 2006
Location: NW Arkansas, Ozark Mountains
Posts: 10,926
I think he meant above the fiberglass. Is that correct, AC?

If so, then no, you wouldn't use lath there.
__________________
Kevin

The top ten reasons to procrastinate:

1.
Kman is offline   Reply With Quote
Unread 05-18-2019, 03:08 PM   #12
Anthocar
Registered User
 
Join Date: May 2019
Location: Austin, TX
Posts: 40
Yep between fiberglass and deck mud is what I was asking. I've seen countless videos and even more reading and some folks use lath for the deck mud to grab on to. I'll just start packing in the deck mud directly over the fiberglass (after the water test).

Is there a CBU you would recommend? I already have hardibacker up at the top. Can I use CBU at the bottom to salvage the work I've already done?

Thanks again for the guidance.

AC

Sent from my SM-N960U using Tapatalk
__________________
AC
Anthocar is offline   Reply With Quote
Unread 05-18-2019, 03:09 PM   #13
Anthocar
Registered User
 
Join Date: May 2019
Location: Austin, TX
Posts: 40
Here's a pic of the hardibacker

Sent from my SM-N960U using Tapatalk
__________________
AC
Anthocar is offline   Reply With Quote
Unread 05-18-2019, 03:22 PM   #14
cx
Da Home Builder
 
cx's Avatar
 
Join Date: Jul 2001
Location: Boerne, Texas
Posts: 88,415
Problem you'll have there is that most real 1/2" CBUs are 1/2" thick, whereas Hardiebacker 500 (their alleged 1/2" verison) is only about 7/16ths" thick.

Whatever that is smeared on the edges of your existing wallboard is likely gonna be a problem for you, too.

My opinion; worth price charged.
__________________
CX

Y'ALL NEW VISITORS READ THIS HERE!
cx is online now   Reply With Quote
Unread 05-18-2019, 03:31 PM   #15
Anthocar
Registered User
 
Join Date: May 2019
Location: Austin, TX
Posts: 40
Ok so I guess I'll remove everything which is a real pain, but I want it done right... What kind of cbu do you recommend and why is hardibacker not up to par?

Sent from my SM-N960U using Tapatalk
__________________
AC

Last edited by cx; 05-18-2019 at 07:03 PM.
Anthocar is offline   Reply With Quote
Reply

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
Tile Over Fiberglass Deck deepwater28 Professionals' Hangout 2 11-08-2013 06:27 AM
Fiberglass shower pan icedT Tile Forum/Advice Board 10 10-23-2007 08:01 PM
fiberglass shower pan Q's ashleykremm Tile Forum/Advice Board 18 12-23-2006 11:43 PM
8'x4' new shower => fiberglass pan? jfbailey3 Tile Forum/Advice Board 23 09-01-2005 09:06 PM
mud pan in fiberglass shower pan corny Tile Forum/Advice Board 2 12-16-2003 07:55 PM


All times are GMT -6. The time now is 08:04 PM.


Sponsors

Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright 2018 John Bridge & Associates, LLC