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What if subfloor is not level?

Author

Rachel Ellis

Published Jan 20, 2026

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.

Does a subfloor have to be perfectly level?

No subfloor is perfectly level, but any signs of unevenness and high or low spots must be remedied.

How do you fix an uneven subfloor?

Depending on the situation, you can either sand down areas of the subfloor that are too high, or install shims beneath the subfloor so that the entire floor is brought up to the same level.

What do you do if your floor isn't level?

There are multiple ways to fix a floor that sags and dips.

  1. Pour Self-Leveling Underlayment. Pour self-leveling underlayment in the problem area. ...
  2. Sister the Joists. ...
  3. Prop Up the Joists. ...
  4. Lay Down New Hardwood.

Should I worry about uneven floors?

If you're considering purchasing a home with uneven floors, don't wait to investigate the potential issues beneath the home's surface. The slope or slant of the floor may be a minor cosmetic issue, or it could indicate water damage or major problems with the home's structure or foundation.

27 related questions found

How do I even out my plywood subfloor?

Pour the liquid-like floor leveler onto the subfloor and smooth it out with a trowel. Gravity will help it settle into the low areas. Remove any excess floor leveler and feather it around the edges so it blends with the rest of the floor. Let the floor leveler dry overnight or as indicated by the manufacturer.

How much does it cost to level subfloor?

Depending on what you want and the extent of your leveling job, floor leveling can cost as little as $2 per square foot or as much as $30. If you're planning on a more luxurious finish and multiple coats, you can expect the price to go up accordingly.

How do I check my subfloor level?

To check, place a long level or straight pipe on the subfloor. Move it to different areas and mark any spots with a pencil or marker where you find that are higher or lower than normal. Most subfloors will have at least a few spots with slight variations.

Can you lay laminate over uneven floor?

Laminate can be installed on an uneven floor; however this can degrade the quality of your new laminate. The finished product may become warped as a result, causing the floor to shift and become damaged when walked on. For this reason, it is best to level the subfloor prior to installing laminate.

Do I need to level floor?

The only leveling you need to do is to smooth out the surface to get rid of any bumps or dents. This is the foundation on which you surface (finished) surface rests. It gives sturdiness and balance and is attached to the floor joists. In a kitchen, appliances are usually attached to this surface.

How do you shim a subfloor?

To shim the floor, take a straightedge or a level and look for imperfections in the flatness of the floor and determine if it needs to be raised or lowered. This may require either sanding high spots or shimming with shingles in the low spots to build them up.

How level should a subfloor be for vinyl planks?

What is this? 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. It also can't have a dip of ⅛” within 2'. Level means that a floor doesn't slope in any direction.

Can you install vinyl planks on uneven floor?

In fact, vinyl flooring works great, even on uneven surfaces. You can install a vinyl plank over a slightly uneven floor. However, for vinyl flooring installation, you need to ensure that your subfloor is clean and level. This may involve the use of a sanding or self-leveling compound.

How smooth does subfloor need to be for laminate?

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.

What's the best flooring for uneven floors?

Below are the best possible options for you to cover and decorate your uneven flooring.

  1. Engineered Wood. Among all floating floorings, engineered wood is one of the most favorites. ...
  2. Luxury Vinyl. Luxury vinyl is the newest version of vinyl flooring. ...
  3. Sheet Vinyl. ...
  4. Laminate. ...
  5. Linoleum. ...
  6. Carpet. ...
  7. Solid Hardwood.

Can I put new subfloor over old subfloor?

One of the benefits of removing the old flooring is it allows you the chance to fix any loose subflooring or squeaks by re-securing the main subfloor to the floor joists prior to installing the new flooring. With all that being said though the answer is YES you can install New Wood Flooring over the old.

Does my subfloor need to be replaced?

“Adequately protected from moisture, most subfloor materials can be expected to last for the lifespan of the home.” However, if the subfloor is consistently exposed to moisture, you may need to replace it after 20 to 30 years or sooner.

Why does my floor shake when I walk?

Floor vibrations are generally related to human activity, vibrating machinery and external forces. Walking is the most common source of floor vibrations and more than anything is simply considered a nuisance.

Is it expensive to level a floor?

Average Cost to Level the Floor in a House

On average, you are looking at about $3 – $5 per square foot. So, for a 100 square foot slab, it would generally cost between $300 and $500.

Can OSB be used as subfloor?

OSB Subflooring. OSB subfloor serves as a base under the finish floor (hardwood, engineered wood, vinyl tile, etc.) and even below the underlayment, in some cases. Plywood has long been used for subflooring.

Is plywood a subfloor?

A subfloor is a wooden, structural substrate to which durable finished flooring is attached. Plywood is usually used as subfloor today. There are many types, sizes and configurations of plywood. Different plywoods use various materials and methods of manufacture, depending on the application for which they're intended.

How do you level a uneven wooden subfloor?

Mix the floor leveling compound with water in a bucket, following the manufacturer's directions. Pour a generous amount of leveler onto the subfloor and spread it over the floor with a towel, allowing it to settle into low areas.

How do you level a sloping floor with plywood?

Place strips of plywood across the floor to fill deeper slopes, increasing the thickness of the plywood at regular intervals to correct the slope. For example, fill a 1-inch slope across 8 feet by putting a 12-inch strip of 3/8-inch plywood at the point where the slope is that deep.

Can you put floor leveler over plywood?

If you've got a plywood subfloor, like many buildings do, you can leave it in place and apply self-leveling concrete directly on top of it. Once the plywood subfloor is covered, just apply the finish you want to achieve the desired look.

How do you fix uneven subfloor on vinyl planks?

Using a flat-edged trowel, apply the floor leveling compound. Fill in all dips and uneven spots in the subfloor. Allow the leveler to dry as is instructed by the manufacturer's product label. Remove hills or humps using a floor sander until the entire floor is level.