5 Best Underlayment for Uneven Floor

The durability of the floors is determined by the flooring’s quality. The quality of the flooring is important, but the structure that supports it is extremely important. The sub-floor serves as the foundation for all flooring. Even if the flooring is of excellent quality, an uneven subfloor might cause problems to appear prematurely.

An uneven subfloor can be adjusted with underlayment. Keep in mind that underlayment should only be utilized for minor imperfections in particular cases. It is recommended to seek the services of a contractor if there is general sloping that alters the perimeter as a whole, such as sloping to the side or center. Underlayment should work for you if all four corners of the room’s perimeter are level. We’ll go through the benefits of underlayment and the best underlayment for an uneven floor.

Best Underlayment for Uneven Floor

  1. Fibreboard Laminate Underlay 5.5mm

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Flattening uneven flooring has never been easier. Wood and laminate floors require a fully flat subfloor, and this is where Fine Floor Fibreboard comes into place. Fibreboards are intended for use with wood and laminate flooring over uneven subfloors, whether the issue is wobbly floorboards or cracked and scarred concrete. Simply stagger the fibreboard sheets, then install your laminate or wood flooring on top. To cushion laminate flooring, place it beneath it.


  • It is ideal for bridging gaps and joins, and leveling small indentations or protrusions (up to 3mm). 
  • Improves walking comfort and lowers noise. 
  • Easy to cut and simple to lay. 
  • Excellent sound deadening qualities. 
  • Safe to use on both wood and concrete subfloors. 
  • Provides a firm foundation for your new floor.


  • Not to be used on industrial floors



"QuietWalk Laminate and Floating Wood Flooring Underlayment with Attached Vapor Barrier- Sound Reduction, Compression Resistant, Moisture Protection 6'Wx60'L Roll (Covers 360 sq. ft) QW360B1LT"
  • ✔ Use with Laminate, Floating Engineered and Luxury Vinyl Plank (5mm and thicker)
  • ✔ Superior Sound Reduction ‐ Recycled fibers absorb sound and keep it from traveling to other rooms. Makes click-together floating floors sound solid underfoot.
  • ✔ Compression Resistant ‐ Dense recycled fiber structure supports the click-together mechanism and will uphold its supportive configuration under the consistent traffic of the overlying floor.

For uneven subfloors, QuietWalk is the best option. Because QuietWalk is constructed of dense recycled fibers, it does a fantastic job of protecting your floor from minor flaws. QuietWalk’s adaptability is what propels it to the top. It has a moisture barrier and can be used on both wood and concrete sub-floors. Even radiant heat is compatible with QuietWalk. QuietWalk can be used to cover an uneven subfloor and provide many benefits in addition to its original function! QuietWalk offers all of these advantages while being a mid-priced underlayment.


  • Superior sound and moisture barrier
  • Resistant to mold and mildew growth
  • Easy to install
  • Compression resistant
  • Cost effective


  • Dulls knife quickly when cutting


  1. Eco Cork Foam

Eco Cork Foam Underlayment, 75 sq. ft. - The ONLY one with a BUILT-IN 6 mil Vapor Barrier
  • Highest moisture protection: Only 1 w/built-in 6 mil vapor barrier, class 1 moisture vapor rating
  • Superior acoustical properties: Iic 73, stc 66, delta iic 23
  • Outlasting strength: 1/8" (3.2mm) thickness for stronger joints, more stable floors

Eco Cork Foam combines virgin cross-linked polyethylene foam with granulated cork, one of nature’s best acoustic and buoyancy materials, and merges an accredited 6 mil moisture vapor barrier with an overlap to provide a Class 1 vapor impermeable rating, preventing moisture build-up and penetrability from double-layering a plastic barrier sheeting. Eco Cork Foam is made to the highest flooring standards in terms of strength, performance, and durability, as well as the appropriate thickness. It best guarantees that flooring requirements are maintained for the duration of the flooring warranty, and it also makes all floors sound more solid. It can be used on both wood and concrete subfloors that are uneven.


  • Barrier against moisture
  • Maintain noise reduction and impact isolation.
  • Ensures long-term mold and mildew protection
  • It is long-lasting.
  • Eco-friendly


  • Difficult to install


  1. FloorMuffler Underlayment

FloorMuffler Ultra Seal Underlayment 300SF
  • Superior acoustic protection
  • Provides moisture control
  • For use under laminate, engineered and solid hardwood

This ground-breaking product reduces noise and protects floors from moisture in both residential and commercial settings. FloorMuffler is one of the most well-known underlayment brands, having been in business for over 30 years. They’re well-known for their creativity, quality, and efficiency. The underlayment is 2mm thick and consists of polypropylene foam. IIC up to 74m, STC up to 73, and Delta IIC up to 25 are their industrial sound ratings. Their product meets or exceeds construction regulations and provides outstanding acoustic protection.


  • Greater protection against noise
  • Better moisture protection
  • Enhanced comfort
  • Durability
  • Environmentally friendly


  • Sensitive

Why use an Underlayment on Uneven Floor?


Nobody likes to have to repair their flooring on a regular basis. It’s a pain to deal with, and it rapidly adds up! Underlayment will increase compression resistance and assist support your flooring from everyday impacts, whether you have an uneven subfloor or not. This extends the life of your high-priced new floors.


Minor sub-floor flaws, such as uneven subfloors, can be reflected through thin flooring. As a result, the bumps and depressions in your floor may be uncomfortable to walk on and may detract from its aesthetic appeal. The correct underlayment will hide the flaws while maintaining the integrity of your flooring.

Underlayment can also help to keep your flooring from becoming “cold to the touch.” Between your floor and the subfloor, it creates a heat barrier. This may appear to be a little impact, but in the winter, a warmer floor is really appreciated.

Noise Abatement

The flooring will not lay evenly if the subfloor is not level. When walked on, this often results in squeaking and creaking. This might be particularly annoying in a high-traffic area of the house. You can avoid creaking floors by using an underlayment with a high sound rating. They even reduce noise transmission from room to room.

Problems Caused by Uneven Subfloors

All additional flooring layers will be laid on top of a subfloor, which is a thick flat basis. Concrete slabs, plywood, wood planks, and oriented strand board (OSB), among other materials, can be used. If your floor’s foundation is uneven, every subsequent layer will have problems. Ignoring or concealing the unevenness of your subfloor will not address your difficulties; instead, an underlayment can conceal defects and prevent disparities.

Some of the challenges you’ll have to deal with are as follows:

  1. Your floor covering will be difficult to stick to its surface – One of the most serious consequences of an uneven floor is that your floor coverings will not adhere effectively to its surface. As a result, you may notice gaps between tiles or other types of flooring. They not only detract from the overall aesthetic of your floor, but they can also trap moisture beneath it, resulting in long-term water damage. Furthermore, if the flooring layers are not properly put out as a result of the unevenness of the subfloor, you may have creaks and squeaks whenever someone walks across certain areas of the floor. Because they are so annoying, these noises can drive you insane.
  2. Your floor will turn into a tripping hazard – You also have to be concerned about falling hazards in addition to dealing with flooring coverings that do not adhere well and appear unsightly. The more layers you add to your subfloors, the more likely you are to have very uneven surfaces that lead you to slip, trip, and fall. Sprains, fractures, head injuries, abrasions, and bruises may occur as a result of this.
  3. Your furniture will not be properly supported – The more slanted your subfloor is, the more likely it is that parts of your furniture may shift. If your subfloor slopes from end to end, slightly pushed lighter furniture pieces may move in the same way. And if some portions of your subfloor are elevated while others are lowered, you’re likely to have swaying, unstable furniture. It’s possible that your decorative objects or books will fall off if you lay them on shaky furniture. As a result, your furniture may be destroyed or possibly cause harm to someone nearby.

What Causes Uneven Subfloors?

You must first evaluate the problem before deciding on a technique to correct your uneven subfloor. As a result, you’ll be able to take the proper steps to resolve the issue once and for all.

Uneven subfloors can be caused by a variety of factors, which are listed below:

1. Aging

When compared to a new home, an older home is far more probable to have an uneven subfloor. That’s because your concrete slab or any other type of subfloor will wear and tear over time. Furthermore, the aging process will leave many defects in the subfloor, resulting in uneven patches. The type of approach you use to repair the subfloor will be determined by how the ear and tear has impacted it.

2. Issues with the foundation

Sedimentation is the most common source of foundation issues. Weathering causes a home to sink over time, and this is what this process is all about. When this happens, the foundation is strained, weakening the remainder of the structure.

Your floors may become uneven as a result of foundation settling. Additionally, you may see cracks in the floor and walls. You can also have problems with sticky doors and windows. If you notice any of these symptoms, you should be more concerned than usual. Before you start fixing your uneven subfloor, hire a home inspector to check things out. This will ensure that the underlying problem is addressed first.

3. Damaged floor joists

Your foundation isn’t always the problem. The floor joists, on which the subfloor is laid, may, nevertheless, be damaged in some way. Older homes are more likely to have substantial damage to the floor joists. Even in a new home, though, there may be a problem with the joists. Pest damage could be one of the causes.

Termites, powderpost beetles, and carpenter ants, for example, can destroy the wood, rendering it weak. And because there isn’t enough support in those weak spots, the subfloor may sink. Water damage, which can be caused by leaks, damp soils, or humid air conditions, is another cause of damaged floor joists. The moisture causes the wood to decay, weakening it and causing it to sag over time. The subfloor above it becomes uneven as a result of this.

4. Installation and construction techniques that aren’t up to par

The skill of individuals who construct your floor joists, subfloor, or foundation might have an impact on the building’s structural stability. Your floor joists may produce slopes or sag if they are cut incorrectly or have grooves and holes drilled in the wrong spots.

You can potentially have a problem with the subfloor. It could become loose and distorted if it was put incorrectly. Poor construction procedures can also result in depressions and bumps in a concrete slab. Poor blending or application techniques could be one of them.


What can I do if my floor is uneven?

The type of unevenness will aid in determining the solution. To guarantee consistency, wood underfloors will very certainly have to be ripped out and replaced. A flooring underlayment can also be used to smooth out any leftover peaks and valleys in the subfloor. Self-leveling compound is excellent for repairing dips, but it may be ineffective for more serious issues.

How Uneven Can Laminate Flooring Be?

Uneven flooring is defined as having deep plunges and bumps with a depth of greater than 3/16 inch in any direction. Furthermore, laminate flooring cannot be placed over such a floor because the tolerance for laminate flooring on a 10 foot span is 3/16 inch.

Does Underlayment Help With Uneven Floors? 

When placing flooring over another floor, especially if it is uneven, underlayment is one of the most crucial components that you cannot overlook.

Conclusion on Best Underlayment for Uneven Floor

One of the most significant aspects of your home is the floor. It is therefore necessary to keep them in good condition. Uneven floors can occur for a variety of causes, and the sooner you address the issue, the better. Uneven surfaces are not only unsightly, but they can also cause accidents. Walking on an uneven floor is difficult and dangerous, but putting an underlayment can help minimize the flaws.

On the other hand, you can receive a better feeling down beneath your feet if you examine the greatest quality in varieties of underlayment. As a result, it’s necessary to consider installation, durability, flexibility and some other great qualities. You can either hide the bump on the surface by covering it with planks to make it even, or you can force it by leveling the floor and compounding the surface. After all, how you want to adorn your uneven floor surface is entirely up to you.

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