Concrete With Mastic: Prep For Ceramic Tile - Tiling, ceramics, marble - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Flooring > Tiling, ceramics, marble


Thread Tools Display Modes
Old 11-01-2013, 05:32 PM   #1
Join Date: Jan 2013
Posts: 44
Rewards Points: 27

Concrete with mastic: prep for Ceramic tile

Small bathroom floor, formerly covered in asbestos tile. By the time I got the house the tile was already removed and they had peel and stick vinyl down, but didn't get the black mastic off before doing so.

Please note: I have already had an asbestos abatement contractor take samples of the mastic and submit them to the lab for testing- the mastic does NOT contain asbestos.

I want to know how the presence of this residual mastic ( still very tacky in many areas) will affect my concrete prep. I don't have any big cracks to fill and only one corner that is slightly out of level. If I thinset over the concrete (assuming it is cleaned of debris) with the mastic still there, will it compromise the adhesion?

If you think it needs to be removed- how? Or can it be covered over with SLC?

All advice appreciated.

Concrete with mastic: prep for Ceramic tile-image-112722014.jpg


GerardW is offline   Reply With Quote
Old 11-01-2013, 09:56 PM   #2
JazMan's Avatar
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 4,564
Rewards Points: 3,036

Concrete with mastic: prep for Ceramic tile


Most thin set manufacturers tell you; Adhesive residue must be wet scraped to the finished surface of the concrete, leaving only the transparent staining from the glue. To determine desirable results, do a test bond area before starting.

Read the data sheets of a few products that are available to you.

The one corner that is not flat is one too many, fix it. SLC is another option.

The scraper is a wallpaper scraper with a razor blade.

Attached Thumbnails
Concrete with mastic: prep for Ceramic tile-scraper-.jpg  


Tile 4 You LLC Troy, MI - Consulting by phone/internet -PAYPAL

DITRA Installs - KERDI Watertight-Mold-Free Showers. I have NEVER made a mistake, I thought I did ONCE, but, I was WRONG! A+ BBB rating - est. 1987 - over 50 yrs. exp.
JazMan is offline   Reply With Quote

Thread Tools
Display Modes

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
tile on concrete block Master Brian Concrete, Stone & Masonry 3 05-22-2013 09:49 PM
Problem with concrete floor prep for ceramic tile install tdon7 Flooring 8 11-30-2011 10:12 PM
Asbestos tile and mastic phillyDIYER Flooring 14 08-21-2011 01:46 PM
ceramic tile walls with mastic Boris100 Building & Construction 2 02-14-2011 09:39 AM
Concrete floor prep for ceramic tile tpanc13 Flooring 39 06-22-2010 08:50 PM

Top of Page | View New Posts