Bathroom Project

Discussion in 'Remodel Forum & Blog' started by kc1121, Oct 15, 2008.

  1. kc1121

    kc1121 New Member

    Messages:
    33
    Location:
    California
    Have a bathroom that has linoleum(?) from the 70s and an old 3.5gpf toilet that I will be getting rid of.

    The main issue has been to either 1) tear out all the linoleum and scrape off all of the residue, then install the tile or 2) install everything over the existing linoleum.

    It appears the lineoleum is installed onto the concrete on the ground floor of the house.

    A person at HD said that I could go w/ option 2, install the backerboard w/ fluted masonry nails, thin set mortar, install tiles and grout and be done w/ it. Then I can go ahead and install the Toto toilet I picked up.

    Does this sound like an ok option to you?

    Thanks in advance.
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,313
    Location:
    New England
    Not a great idea! It's razor scraper time. Cement board (cbu) does two things, it provides a good surface to tile on, and when installed properly (nailing it down to a concrete slab is not one of them!) has a layer of thinset underneath it filling in any imperfections, providing 100% support.

    The best place for tiling info that is sound and will provide something that lasts is www.johnbridge.com.
  3. kc1121

    kc1121 New Member

    Messages:
    33
    Location:
    California
    so.. you're saying that option would work but not optimal?

    you'd recommend strippping everything out then proceeding w/ the backerboard, mortar, tile & grout?
  4. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    I agree with jad that nailing cement board to existing floor may not be secure. If the nails work loose, then you have a floating floor, prone to cracking.

    If this is a small room, removing the linoleum is only an hour or two job using a four inch razor scraper.
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,313
    Location:
    New England
    On a slab, there is no good reason or need to add cbu...in fact, manufacturers say not to do it with one exception that I know of (Wedi can be installed over a slab with thinset only - and that's only to add some insulation - it can't be installed over linoleum, either).

    IF the slab has cracks, they can telegraph through the cbu into the tile, so they have to be addressed.

    CBU is basically cement...why put cement on cement to tile on? CBU is designed for use on wood, not cement.

    IF, the linoleum is well attached, and you can strip all dirt and wax from it (this isn't really a vinal floor?), then you could use a heavily modified thinset to attach the tiles directly. The problem with that is if you had a spill or something else and the bond between the linoleum and the slab failed, the tile would fail as well. It's safer to remove it. Old linoleum tends to get brittle. Plus, while you need the modified thinset to hold it to the less than ideal surface, that type of thinset needs to both dry the modifiers and cure the cement portion. That's hard between the linoleum and a typical tile...it could take weeks. Not good as a partially cured thinset when the tile are walked on can break the bond. Are you prepared to stay off it for weeks?
  6. kc1121

    kc1121 New Member

    Messages:
    33
    Location:
    California
    ok, so if I'm reading this all correctly...

    i) remove linoleum/vinyl flooring
    ii) scrape off residue and make sure everything is flat
    iii) go w/o the backerboard as long as its concrete floor
    iv) thin-set mortar
    v) lay tiles
    vI) grout

    thanks for all the expert advice
  7. kc1121

    kc1121 New Member

    Messages:
    33
    Location:
    California
    Thanks for the input, I'd estimate at about 40-45 sq ft
  8. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,313
    Location:
    New England
    You want to scrape off enough so it is a whisper of the original. There will be some embedded in the pores of the concrete that won't come off which is okay - do NOT use chemical cleaners, as it would drive the stuff into the slab and create a bond breaker situation. Next test is to dump a little water on, it should not bead up like on a waxed car. If it soaks in, you'll be okay. Then, choose a thinset rated for use over cutback (the adhesive residue). If there are cracks in the concrete, additional prep is required. You won't know until you clean it off.
  9. on concrete, you can leave the linoleum as a tile underlayment.

    Do not add backerboard.
    Do not add backerboard.

    Only experienced eyeballs on site can comment more as to whether or not the linoleum and concrete slab are OK.

    David
  10. frenchie

    frenchie Jack of all trades

    ??? lino's not porous enough for thinset to stick?

    I do it the same as jadnashua... and I'd only add one thing to his post, which is that if the water beads up & doesn't soak in? 1/2 an hour with a grinder, "cup" wire brush on it, will fix that. Wear a proper respirator, though, the dust is insane.
  11. crater

    crater New Member

    Messages:
    49
    yep
    1) remove toilet and vanity
    2) scrape glue off floor
    3) re-float floor with self leveling concrete (if needed) if installing tile try to minimize any dips and crack or really rough concrete. (remember tile likes a surface that has the same plane.) The better the substaight the less problems installing and future problems(cracked tiles)
    4) layout tile pattern
    5) thinset and lay tile
    6) grout
    7) seal grout

    Note: be carful around plumbing that may enter the slab ie: Toilet flange, you may have to raise the flange to accomadate for the now thicker floor.
Similar Threads: Bathroom Project
Forum Title Date
Remodel Forum & Blog Bathroom remodel: Project management software Jan 14, 2014
Remodel Forum & Blog Bathroom vanity replacement Jul 21, 2014
Remodel Forum & Blog Bathroom Shower Remodel Jul 5, 2014
Remodel Forum & Blog Bathroom remodel: underfloor heating and related decisions May 13, 2014
Remodel Forum & Blog Big problems arise after bathroom remodel: advice needed May 8, 2014

Share This Page