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Slate on cinder block wall

Discussion in 'Hardscaping' started by hdtvluvr, Sep 23, 2007.

  1. hdtvluvr

    hdtvluvr LawnSite Senior Member
    Messages: 507

    I have a retaining wall in the back yard that is veneered with slate. Some of the slate pieces are coming off the wall as you can see in the photos. I need to put these back up. What should I use as an adhesive?

    I assume there is a possibility that the tiles are being forced off the wall from water pressure behind the wall (wall is at the bottom of a hill). But I really feel like the job wasn't done correctly to start with (i.e. wrong materials used).

    What is the best adhesive to reattach the tiles?



  2. paponte

    paponte LawnSite Silver Member
    Messages: 2,366

    Wow, no offense but that wall looks horrible. The cinder joints look half empty, and looks like they attached the slate with ceramic tile adhesive. Not sure if there is enough room, but they should have been mortared in place.
  3. EagleLandscape

    EagleLandscape LawnSite Platinum Member
    Male, from Garland, Texas
    Messages: 4,350

    PL adhesive
  4. PerfectEarth

    PerfectEarth LawnSite Bronze Member
    Messages: 1,734

    That wall is fugly.
  5. hdtvluvr

    hdtvluvr LawnSite Senior Member
    Messages: 507

    So I need to purchase some mortar and use that to reattach the tiles? Do I need to use a notched trowel?

    What is PL adhesive?

    Thanks for the comments about the wall.:( I have to admit, it does look a lot better in person.
  6. mrusk

    mrusk LawnSite Gold Member
    Messages: 3,260

    I'd most likely use mastic to re attach the tiles. Any tile place would sell it. However, i will advice that this most likely is only a bandaid.
  7. hdtvluvr

    hdtvluvr LawnSite Senior Member
    Messages: 507

    Why do you say it "most likely is only a bandaid"? Is there a proper way to do it?
  8. cgland

    cgland LawnSite Bronze Member
    Messages: 1,929

    He says that because it's only a temporary fix. The real problem is what lies behind the tiles. Cinder block is another name for "water sponge" and as these block continue to soak up water, you will continually be replacing tiles. tear it down and start over w/ a qualified contractor.

  9. mrusk

    mrusk LawnSite Gold Member
    Messages: 3,260

    You made it sound like there was water coming through the wall. THAT would mean that the wall does not have proper drainage and that their is a chance the tiles would come back off.
  10. hdtvluvr

    hdtvluvr LawnSite Senior Member
    Messages: 507

    I've never noticed water coming through the wall but have read about cinder block wall basements and the fact that water can penetrate the walls. I would think that if water penetrated and forced them off the wall, then some would break instead of popping off.

    I'm not sure why they are coming off. If the wrong adhesive was used then that would be at least one problem.

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