A few years ago, I saw an advertisement for carpet tiles that had a jagged edge so there would be less movement in the interlock between tiles, and prevented the need for glue. (would like to find these or similar)

I have a below grade room that has ceramic tile over concrete floor. We want to carpet this area, and figured carpet tiles might be the best/easiest way to accomplish this. Additionally, the room is a pass through from the garage to the main level and is a high traffic area. We thought carpet tiles would be nice, as we could replace sections of it if need be.

That being said, we would like carpet tiles that don't have to be glued down. Any suggestions?

Also, should I put down a barrier (like you would with a floating floor)? Or put down a moisture block?

Additionally, do I need to make any considerations for the grout spacing in the tile (for the ceramic tile underneath)?


considering DriCore, but because of the chip board and lack of mold treatment, it has possible moisture issues.

Possible alternative: http://www.supersealonline.us/

and another alternative: http://www.spycor.com/DMX_Subfloor_for_Concrete_p/dmx1.htm

  • Is the current floor down there just concrete? Sep 4, 2012 at 12:14
  • 1
    You don't need grout with carpet tiles.
    – ChrisF
    Sep 4, 2012 at 12:47
  • @ChrisF - for the ceramic tiles underneath...
    – Jason
    Sep 4, 2012 at 13:02
  • @TheEvilGreebo - 6" ceramic tile on concrete
    – Jason
    Sep 4, 2012 at 13:03

1 Answer 1


Assuming you want to do this right and don't mind a little elbow grease.

1) Clean it up

Remove the ceramic tile, and strip the floor down to the bare concrete. Technically you don't have to do this, but not doing it is, IMO, just lazy. Building up the floor is convenient but not the best work you can do.

2) Build the base

Now that you're down to bare concrete, install Dri-Core tiles or something similar for subflooring, making sure you add ventilation as per manufacturer instructions. This product protects itself from moisture (except in a flood of course) and will likewise protect the tile from small moisture accumulations.

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3) Put down whatever floor you like.

There are a number of interlocking carpet tile products available that allow you to do a floating style installation.

The grout question is a non issue if you remove the ceramic, as you should.

  • 1
    +1 for a very good solution. Have used DriCore and it is softer and warmer than a concrete base. However, it is a big job and it eats up about 3/4 inch, if ceiling height is an issue.
    – bib
    Sep 4, 2012 at 13:47
  • The thickness is a reason to remove the ceramic tile as well. Sep 4, 2012 at 13:48
  • Ya, but you gain less than 1/4 and you lose slightly more than 3/4, if I recall right. Only an issue if a) it is low to begin and you care about how low or b) you have a building inspector with a a rigid view about 7 ft (or whatever code is) ceilings and this would tip it AND an inspection is necessary (need for new certificates of occupancy sometimes come up in resale).
    – bib
    Sep 4, 2012 at 13:53
  • Ceramic tile ranges in thickness from 1/4" to 3/4", and there's usually at least 1/4" of mortar underneath, so it's definitely gaining more than 1/4" by removing the old tile. Sep 4, 2012 at 14:02
  • 2
    interesting article about the shortcomings of DriCore: cqs.com/homeqa/dricore.htm
    – Jason
    Sep 5, 2012 at 0:39

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