How do you build a subfloor over uneven concrete?

6 Ways To Fix Uneven Subfloors Or Concrete Slabs

  1. Use Self-Leveling Concrete/Underlayment. How to Self Level Concrete Floors Like Pros – Self Leveler. …
  2. Install A Flooring Underlayment. …
  3. Grind Or Sand The Subfloor. …
  4. Replace The Subfloor. …
  5. Fix Your Floor Joists. …
  6. Stabilize Your Foundation.





Can you put subfloor over concrete?

You need a dry, clean and flat surface before you can install finished flooring in a room built on a concrete slab. One of the simplest options is a sleeper-based subfloor. The result is a subfloor that protects finished flooring from cold and damp concrete-based floors.

Do I need a subfloor over concrete?

A subfloor will help insulate against a concrete floor that becomes overly cold in winter. The concrete slab must be clean, sound, and level, with any serious cracking repaired, before you install your subfloor. — Always check your local building code before choosing a particular subflooring material or design.

How do you level a concrete slab?

Quote from the video:
Quote from Youtube video: You take a straight edge or a screed. And you run it across the rails leveling the compound and making it even with the top of the rails using the rails as guides.

What can I do with uneven concrete?





With uneven concrete floors, the quickest and most effective remedy for the situation is to use a self-leveling compound that fills in the low spots and makes the floor completely level. Floor topping can fix a great many problems floors to create an aesthetically pleasing surface for floor polishing.

How do you fix an uneven slab?

Quote from the video:
Quote from Youtube video: And clean off the surface in preparation for the concrete glue well apply the concrete glue directly to the surface. And you'll need just enough to coat the entire surface.

How do you install a subfloor on a concrete slab?

Quote from the video:
Quote from Youtube video: DMX is a good product it has a foam underlayment that's built in as well to prevent that hollow sound but you can achieve the same thing by putting the landscape fabric down for a lot cheaper.

How do you install subfloor over existing floor?

  1. Step 1: Remove Old Flooring. It may seem obvious, but the first step to adding a second layer to your subfloor is to remove the old flooring. …
  2. Step 2: Remove Underlayment. …
  3. Step 3: Decide on Plywood. …
  4. Step 4: Acclimate Plywood. …
  5. Step 5: Install Plywood. …
  6. Step 6: Keep in Mind.
  7. Can I put plywood over concrete floor?

    If you’re installing plywood over an existing dry concrete floor, you shouldn’t have any problem. However, a new concrete floor contains a lot of moisture. So, you need to allow it to cure for at least 60 days before even bothering to check the moisture level.

    How do you level a floor without leveling compound?



    Quote from the video:
    Quote from Youtube video: And we said the answer is yes from the manufacturer you do not need to use thinset to apply onto plywood as long as the floor is level and the plywood that's used is proper.

    Is self-leveling compound necessary?

    So if you’re installing hardwood flooring over top, you will need a self-levelling cement that you can nail through. Also, some products can have tiles installed on top, others require a decoupling membrane on the substrate before the cement can be poured.

    How do you level concrete after it dries?

    Here’s what to do:

    1. Fill any cracks with epoxy. …
    2. Apply latex bonding compound over all the concrete when the floor is absolutely dry. …
    3. Mix the self-leveling compound with water, according to the manufacturer’s instructions. …
    4. Pour the self-leveling compound immediately, because it can dry very quickly.

    Can you level concrete with concrete?



    You can level an existing concrete floor with a leveling layer of new concrete, but you must prepare the old concrete floor first. Neglecting to prepare the old surface will prevent the new concrete from adhering correctly, resulting in a weak bond between the two layers.

    Can you grind concrete to level it?

    If you have an uneven concrete slab, you could replace it or cover it with leveling compound. But consider grinding it instead. Powerful grinding equipment is available at rental centers that cater to contractors.

    What is the cheapest way to level a concrete floor?

    There are self-leveling coatings designed to fill gaps and cracks. You could also try using vinyl floor tiles to make the transition more gradual. Probably the easiest (and cheapest) thing to do would be to get a big diamond grinding wheel and bevel down the lip.

    How thick can you use self-leveling concrete?

    How Thick Can You Pour Self Leveling Concrete? The thickness depends on the product you use. But standard thicknesses are between ⅛ inch and 1 inch. However, there are mixes that can be poured as thin as 1/16 inch and as thick as 5 inches.

    Can you fix uneven concrete?



    Level your concrete patio using slab jacking or polymer slab lifting techniques. Once everything is level, you can resurface or veneer the concrete to cover up any remaining cracks. Generally, fixing uneven, cracked concrete is pretty straightforward and does not require replacing the entire patio.

    Can you pour concrete on uneven ground?

    Concrete slabs have a variety of uses, including home foundations, walkways, and patios. If you pour your concrete on uneven ground, the slab may look crooked or get damaged as it dries.