What Do I Use on Rough Concrete Floor?


We built our garden shed {15ft wide x 18ft long} over an existing concrete slab that had been 'raked' when it was originally poured. The raking was done to make the slab solid footing for baby calves in the winter. Now that it is inside our garden shed, the rough flooring makes it hard to keep clean and also makes standing on it for any length of time hard on our poor old 72-yr old and 77-yr-old feet. What can we use to put {or pour} over the floor so we can make it nice and smooth without it costing a lot of $. We got an 2 estimates from contractors and they wanted $1,600 and $2,000 to fix the floor with more concrete and/or the rubber flooring but that's way too high for our retirement budget. Any suggestions will be much appreciated.

  11 answers
  • Carol Thomas Carol Thomas on Jul 28, 2018
    You could use those big interlocking foam blocks. They are fairly economical.

    • Thelma Thelma on Jul 28, 2018
      Thank you for the suggestion, we tried those but the floor is so rough from the garden rake being used on it when it was first poured that when you walk on it, it pull the foam apart.
  • Susan Massey Susan Massey on Jul 28, 2018

    How about that green indoor-outdoor carpeting, you can just hose it off.

    • See 1 previous
    • Susan Massey Susan Massey on Jul 28, 2018
      Hmmm, I see. Perhaps call a concrete company and see what they recommend.
    • Thelma Thelma on Jul 28, 2018
      This floor {slab} is inside a building that has the inside walls finished so we cannot use a high pressured washer on it. Is there something I can paint on the floor after using a high-pressure air hose to blow it clean!
  • Dmotan Dmotan on Jul 28, 2018
    First of all what a wonderful size for a garden shed
    thinking inexpensive what about going to a thrift store and getting a rug. If it gets dirty just vacuum which u can also buy from thrift store. Some stores have very cheap carpet squares such as Ollies
    OR a heavy deck paint which will make it more comfortable and less rough
    keep gardening !!!!!!

  • William William on Jul 28, 2018
    You can use a floor and porch paint. Paint will not level the floor. You still need to resurface it.
  • Jewellmartin Jewellmartin on Jul 28, 2018

    Another 1/2” of smooth concrete or cement floor on top should give you the base you want. Then paint, tile, carpet, or laminate on top. If your shed is well sealed and insulated, it should be dry and useful rear ‘round. Best wishes, Thelma! ☺️

    • Thelma Thelma on Jul 28, 2018

      It will take a full 1-1/4" of concrete on top to level off the sharp points. My problem is getting the new concrete to adhere and be permanent on the old floor. Everything I have been told and have read says we need to pressure wash the old concrete and that is not possible since the inside walls are finished. And yes, there is insulation in the walls and ceiling so that also keeps us from using a high pressure washer.

  • 16999903 16999903 on Jul 28, 2018

    I agree with Susan. It sounds like you need to have a layer of concrete poured over it to fill in the gaps. Check with a professional and good luck!

    • Thelma Thelma on Jul 29, 2018
      We did check with a contractor and a concrete company, they each wanted $1,600 to add a layer of concrete on top of our existing floor. The worst part of their 'bid' was that neither one of them would give any kind of guarantee that the new pour would adhere to the old slab or that it would last more than 6 mos.
  • Carol Thomas Carol Thomas on Jul 28, 2018

    Wow! That is rough!

    • Thelma Thelma on Jul 29, 2018
      Yes, it's really rough. I just need a product that I can put on it after I air clean it {can't use water pressure as the inside walls are insulated and finished}, the product needs to make the new concrete adhere to the old slab. My hubs and I {he's 77 and I'm almost 73} can do the work ourselves, just need the name of an adherent that will work.
  • Jewellmartin Jewellmartin on Jul 29, 2018
    If you haven't spilled any oil on the shed floor, you don't need a pressure washer. Maybe you should rent a sander and work on the floor. 😇
  • Gail Gail on Jul 29, 2018

    You can fill the grooves with a sanded grout & cover area & smooth out as you go. This will keep a non slip surface but be much easier on your feet. You can then put down rubber backed carpet in a solid piece if you wish. Or, actually if me, I would get an ex large outdoor rug & put down in center walking area. You could move outside & hose down to clean if need be. This would be a lot leas costly & you could likely do it yourself.

    • Thelma Thelma on Jul 30, 2018
      Thanks for the suggestion but I need to be able to sweep the floor to keep it clean after I use the potting bench to transplant things into bigger pots. We do all our own construction, but since we are 77 and 72, moving a large rug in and out a doorway would be too awkward for us. I am thinking of maybe trying the grout 'sand' that goes between tiles, etc. outside, then lightly sprinkle/mist it by hand to get it to set up solid. That might work.
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