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 > Professionals' Hangout


Thread Tools Search this Thread
Old 05-16-2016, 09:34 PM   #1
Registered User
Join Date: May 2016
Posts: 1
"Mold" showing up

Well, here goes....I've been a tile contractor for 26 years and never (fingers crossed) have had any major problems. We just finished a job with very porous limestone (2 bathrooms). We sealed the tile before we installed it (front and back) and we sealed the tile after we installed it. We then grouted and then sealed the tile again. We verified that water definitely was beading up. We passed our pan test and made sure the weep holes were unobstructed during the install (standard stuff).

We get a call from the contractor saying the owners are saying there seems to be mold or some sort of dark stain showing up around the drain and now its gravitating up the walls UNDER the seal. We're of the opinion the tile is dirty (possibly a bad cut from the mountain). What are your thoughts? I've never experienced this....has anyone else?
mar-cal is offline   Reply With Quote
Sponsored Links
Old 05-16-2016, 11:18 PM   #2
Kman's Avatar
Join Date: Nov 2006
Location: NW Arkansas, Ozark Mountains
Posts: 9,744
Welcome to the forum, Ron.

Would you describe the method you used to install the shower, i.e. the waterproofing methods, materials used, etc.?

Exactly how long since it was finished?

The top ten reasons to procrastinate:

Kman is offline   Reply With Quote
Old 05-17-2016, 04:31 AM   #3
Re-Remodeler & Re-Tiler
Mr.Miyagi's Avatar
Join Date: Aug 2007
Location: Maryland
Posts: 350
Do you know the name/origin of the limestone? Some limestones shouldn't be installed at all due to the porosity.
Mr.Miyagi is offline   Reply With Quote
Old 05-17-2016, 05:00 AM   #4
Tile & Stone
Join Date: Sep 2002
Location: Northeast/Connecticut
Posts: 2,351
Did you do a pre-slope under the liner?

CTEF Certified Installer
I lost my hero on 5-21-16 You will be missed. Semper Fi
tilemanct is offline   Reply With Quote
Old 05-17-2016, 07:00 PM   #5
Moderator -- Mud Man
Davy's Avatar
Join Date: Jan 2003
Location: Princeton,Tx.- Dallas area
Posts: 30,190
Hi Ron, welcome. Keep in mind, Just because a shower has mold doesn't automatically mean it wasn't installed correctly. How well do they keep it clean?

About 6 months ago I tiled a shower for a guy and I also tiled his master shower about 3 years ago (with porcelain). While I was there this last time, he told me that the epoxy grout that I bragged about so much wasn't holding up very well. He said that the shower I tiled 3 years ago had mold in places, mostly in the grout joints. I told him to show me. We walked in the master bath and he pointed to the grout under the niche. I asked him what the white haze was on the tile and he said it looked like soap film. I said yes, you're right. And if you don't clean your shower, mold will sometimes show up on soap film. I was trying to tell him in a nice way that he was a slob and that he needs to scrub his shower down.

Davy is offline   Reply With Quote
Old 05-18-2016, 05:23 AM   #6
Tile & Stone
Join Date: Sep 2002
Location: Northeast/Connecticut
Posts: 2,351
Those who tout mold free installations are setting themselves up for a lawsuit. If we remember science class in high school, mold spores are everywhere and if there is a food source, they will thrive.
I did a job with a pitted travertine, Told the customer not the best choice for a shower. They and the tile salesperson disagreed. After a month I get the call, mold. I go and look at it. The filthiest shower ever. They never cleaned it from day one. Soap scum everywhere. Being the idiot I am, I cleaned the shower and it looked like the day I left. Sealed it again and told them how much it would be for me to come out and do this once a month. Never heard from them again.
Just because its stone and a high performance grout does not mean it cleans itself!!

CTEF Certified Installer
I lost my hero on 5-21-16 You will be missed. Semper Fi
tilemanct is offline   Reply With Quote
Old 05-18-2016, 06:45 AM   #7
Tiger Mountain Tile Inc
tile lackey
Tiger Mountain Tile Inc's Avatar
Join Date: Feb 2011
Location: Issaquah, Washington
Posts: 6,454
I've had some of my customers read the marketing materials for the newer grouts and are surprised when they have to clean their shower. Now I tell them ahead of time that when they clean it the grout will turn back to it's original color. White will become white again!

Mold will grow in a one piece fiberglass shower. It will definitely grow on grout and tile.
Jim Upton
Tiger Mountain Tile Inc 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
Need advice on fabricating "perfect" 45 degree bevel edge on 1/2" thick black galaxy Exsequor Professionals' Hangout 11 07-03-2014 06:34 AM
Sealed grout "dissolved".."scratached" out with regular cleaning? emilyardore Cleaning, Restoration and Sealing 1 05-18-2010 06:15 PM
Is Gannet "liberal" or "conservative" media? Shaughnn The Mud Box 17 11-07-2006 07:17 PM
Help - Shower base has "soft" or "sandy" portion motxla Cleaning, Restoration and Sealing 2 10-02-2006 09:17 PM

All times are GMT -6. The time now is 11:03 AM.


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