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
Old 09-17-2007, 06:32 AM   #1
Registered User
Join Date: Jun 2007
Location: Phoenix, AZ
Posts: 11
Do I need to scarify old concrete slab?

Hi, Thanks in advance for any help!

We are tiling an older house in Phoenix that also has a newer addition. The older part of the house has original concrete floors that we have been told had color added in the top most layer. It doesn't appear to be sealed in any way however, and is now about 70 years old. The new section was poured about a year ago.

Our plan is to do some grinding and SLC in the old section to get flatness, but wonder if we need to scarify or "shotblast"? the rest of the area?

We will be putting in 20" ceramic tile - most likely using Mapei Ultracontact (based on stuff I've read here).

jseibert is offline   Reply With Quote
Sponsored Links
Old 09-17-2007, 06:59 AM   #2
Brian in San Diego
AC Specialist -- Schluterville Graduate
Brian in San Diego's Avatar
Join Date: Oct 2005
Location: La Quinta, CA and Usk, WA
Posts: 10,767

Welocome to the forum. You may get some opposing opinions but I am of the opinion if the surface is flat, has no glue residue or paint on it and passes the water absorption test then you should be able to set tile on it. I might add it should be free of cracks as well.

If that doesn't work, I'll always think it should have.
Brian in San Diego is offline   Reply With Quote
Old 09-17-2007, 08:47 AM   #3
jay f
Illinois Flooring Man
Join Date: Aug 2002
Location: morris il
Posts: 1,147
Send a message via Yahoo to jay f
Many colorants for concrete, especially after the concrete is finished, are an acid based product. Checking for water absorbtion is a must, but scarifying or shotblasting is not a bad idea, it will only increase the bonding surface. Just a thought.

give me thin set or give me death!!!
jay f is offline   Reply With Quote
Old 09-17-2007, 08:59 AM   #4
Official Felker Fanatic
tileguytodd's Avatar
Join Date: Jun 2002
Location: Northern MN
Posts: 14,398
I cant disagree with anything ive read.....I, Like Brian do not believe in buying any more work than is actually required to complete a project.

Do the absorption test first.

Ultracontact is a good choice for your large format tile.
TIP YOUR TILE MAN, His Retirement plan is not nearly as lucrative as yours and his waning years will be far more painful to boot.
He gives much so you can have a Beautiful Home!!
tileguytodd is offline   Reply With Quote
Old 09-17-2007, 11:42 AM   #5
Registered User
Join Date: Jun 2007
Location: Phoenix, AZ
Posts: 11
Seems like it would be nice not to have to scarify.... when we do this water test, is there an amount of time for absorption that is too much? Are we talking seconds? minutes? And is there a specific amount of water? drops? a cup?

sorry to be dense!
jseibert is offline   Reply With Quote
Old 09-17-2007, 04:21 PM   #6
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 12,180
You don't need to flood the floor...a few drops big enough to not evaporate in a moment or so...see if they are absorbed into the floor or end up just sitting there like on a newly waxed car.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
jadnashua 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

All times are GMT -6. The time now is 01:13 PM.


Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright 2014 John Bridge & Associates, LLC