Laminate flooring on an uneven floor will cause many problems. One of the major problems are loud pops and cracks that will eventually surface when you walk across due to pockets of air beneath the surface as a result of the uneven subfloor.
If your subflooring has bumps or dips you'll want to get rid of those before installing your laminate flooring. It's important that the surface is nice and flat for the laminate to be installed. You can use a floor leveling compound to any dips and let it dry thoroughly before moving on.
Fibreboard Underlay
It works to smooth uneven floors, reduces noise, and acts as a thermal barrier. If the subfloor is uneven, fibreboard works to even dips and dents you can't level out. It's also necessary to add a DPM if you're installing fibreboard on top of a concrete subfloor.
The best flooring for uneven floors due to its attractiveness and durability is epoxy, which can also be designed to mimic a wide variety of appearances.
The best option for slightly uneven subfloors is a direct stick installation (involving nails & glue) if this is a viable option. Floating flooring is not recommended for uneven floors as this increases risk of the planks moving or splitting apart.
When you're installing a vinyl plank floor or any rigid type of new flooring, it's important for the underlying layer to be both level and flat. If you're installing vinyl planks on top of a concrete floor, the standard tolerance required is for the floor to be level to 3/16” within a 10' radius.
You can't go wrong with vinyl that's designed to go directly over concrete. Vinyl is durable, easy to install, and highly moisture-resistant. The best options for both appearance and ease of installation are vinyl planks and sheet vinyl.
The main things that you need to consider when choosing the thickness of your laminate floor are the evenness of your subfloor and any reason you may have to be worrying about noise reduction. If you have a subfloor that is in any way uneven, it pays off to choose a thicker laminate.
Underlayment can serve as a relatively simple fix to an uneven-subfloor. Keep in mind that in some circumstances you won't be able to use underlayment as underlayment should only be used for minor imperfections.
Most manufacturers recommend that the floor be flat to within 3/16” in a 10 ft. radius. These measurements are consistent with most other types of floor coverings. On floating floors, vertical movement needs to be kept to a minimum.
Typically, the floor must be level and uniform within 3/16 inch every 10 feet. Check your wood flooring manufacturer's recommendations and sand any high spots with a concrete grinder. Fill any low spots with a cementitious leveling compound following the manufacturer's directions and allow it to dry before proceeding.
You can install vinyl on many types of subfloor, including concrete and wood. But that floor must be flat for your installation to be a success. An uneven subfloor can lead to potential problems, such as planks having varying heights that will make the flooring unstable and wear down more quickly.
With a concrete subfloor, you will need an underlayment that acts as a vapor barrier in order to prevent moisture from penetrating through to your laminate installation. The normal choice is a thin foam pad material made of polyethylene or polypropylene, which rolls out in sheets.
While costs are similar, the value of premium vinyl far exceeds that of laminate based on quality and value. Unlike laminate, premium vinyl is durable and stable, resistant to moisture and climate, and is easy to install and maintain. Laminate is restricted to light traffic and low moisture applications.
Yes, and that's one of the questions we hear most often is about luxury vinyl plank (LVP). Most homes in Florida don't have basements so, rather than an actual concrete subfloor, the concrete is a slab-on-grade, meaning no basement floors and no walls. The slab needs to be free of debris, as dry as possible and level.
For very uneven flooring, laminate sheets or tiles may be a better bet. This material is more flexible, but may reveal the imperfections in the surface. The most durable and attractive option for an uneven floor is often a pour on option, such as epoxy.
While a subfloor is not necessary to add structural strength when you'll be laying finish flooring on top of a concrete slab (as in a basement remodel), subflooring over concrete offers two other advantages: Dampness control. Install a vapor barrier of plastic sheeting before laying the subfloor.
Sand Mix, Portland Cement & Gypsum-Based Compound are practical alternatives to the self-leveling compound. These options are cost-effective materials that are ideal for smoothening up your floor. At the same time, you can also try Drywall Compound and Foam.
Engineered wood flooring is a more traditional option that can be installed over uneven surfaces. It's made of a thin layer of solid wood on top of multiple layers of plywood. Engineered wood flooring is also relatively durable, easy to maintain, and can help retain the look and feel of an historic home.
Moisture Shield
Furthermore, if you are installing vinyl planks directly over a concrete floor, a waterproof underlayment is essential.
Therefore, because concrete is porous, it's a good idea to install a vapor barrier over your concrete subfloor before installing your flooring. This way you can stop the vapor drive of water upward to your floors, protecting them from any damage (source).