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does floor have to be level for hardwood

by Brielle Stracke MD Published 1 year ago Updated 1 year ago
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Reasons Why It Is Important To Level Floor for Hardwood

  • It ensures the floor will be stable and durable.
  • It creates a flat surface for the installation of wood floors.
  • Without leveling, your new hardwood can warp under pressure causing it to buckle or bend in some areas. This is because not all parts of the subfloor are at an even level which can cause stress on the wood.

Hardwood floors do need a flat subfloor surface in order to prevent them from buckling after installation. Creating a flat subfloor involves lowering the high spots and raising the low ones.

Full Answer

Can hardwood flooring be installed below grade?

For example, basements are almost always below grade, since they are below ground level. Solid hardwood floors should not be installed below grade, or below the ground outside. This makes it difficult (if not impossible) for moisture to escape. Instead, you should consider engineered hardwood floors if you want to install below grade.

Do I need a level subfloor under a floating hardwood floor?

Although many people assume level subfloors are required under floating wood floors, the reality is a little more complicated. Having a flat subfloor ensures your floating engineered hardwood flooring fits well.

Why is it important to level the floor before installing wood?

It creates a flat surface for the installation of wood floors. Without leveling, your new hardwood can warp under pressure causing it to buckle or bend in some areas. This is because not all parts of the subfloor are at an even level which can cause stress on the wood.

Do hardwood floors have to be flat and smooth?

Flat and smooth doesn't mean that the floor is level. A floor doesn't have to be perfectly level to look superb covered with hardwood strips. Wood floor systems framed with engineered wood I joists, or those made from floor trusses, often are extremely flat or in the same plane.

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Can hardwood be installed on uneven floor?

Can You Install Hardwood on Uneven Floors? In order to properly install hardwood on uneven flooring, the floor itself has to be smoothed out. This can be done through the use of underlays and re-surfacing. For concrete surfaces, sanding and polishing may be required.

Does a floor need to be perfectly level?

It is essential that this subfloor layer be stable, solid, flat, and level. If the subfloor is uneven, with dips, ripples, or waves, this irregularity will be telescoped through to the surface floor covering and can even cause the flooring installation to fail.

Should hardwood floors be completely flat?

1. Wood subfloors must be flat, clean, dry, structurally sound, free of squeaks and free of protruding fasteners. For installations using mechanical fasteners of 11⁄2” and longer, the subfloor should be flat to within 1⁄4” in 10 feet or 3/16” in 6 feet radius.

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

One of the best ways to fix the issue of uneven floor is to use floor patch product. It can be used in concrete subfloor or wooden subfloor. It is best for leveling floors that has dips, slanting issues, cracks and chipping problems.

Is it normal for floors to be slightly uneven?

Uneven floors are rarely caused by problems with the floor itself. The cause is usually settling or shifting of the foundation underneath the floors. If the floor beams and joists are made from wood, like the ones above a crawl space, they will usually bend rather than crack.

Are uneven floors OK?

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.

Why do my hardwood floors look wavy?

As wood absorbs moisture, it can swell. When hardwood flooring swells too much, individual boards will start to push out around the edges and be higher than the center—creating an indentation that runs the length of the board that gives it a “wavy” appearance.

Should there be gaps in new hardwood floor?

Of course, properly installed floors shouldn't experience gaps, regardless of humidity levels or seasonal changes. A reliable installer will properly acclimate the hardwoods prior to placing them in your home, as well as install them in a straight, consistent fashion.

How do you level a floor before installing hardwood?

0:304:09How to Prep Subfloor for Hardwood - YouTubeYouTubeStart of suggested clipEnd of suggested clipYou need to remove any wax paint adhesives or oils with a sander for floating. And nail down floors.MoreYou need to remove any wax paint adhesives or oils with a sander for floating. And nail down floors. You just need to clean up dust and debris what about odors from pet stains.

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.

What type of flooring is best for an uneven floor?

Best Flooring Options for Uneven SurfaceEngineered Wood. Among all floating floorings, engineered wood is one of the most favorites. ... Luxury Vinyl. Luxury vinyl is the newest version of vinyl flooring. ... Sheet Vinyl. UNline LVT and LVP, sheet vinyl comes in a roll. ... Laminate. What is this? ... Linoleum. ... Carpet. ... Solid Hardwood.

How much floor sag is acceptable?

Basically, they are saying if a floor is sloping over a 1/2 to 1 inch in twenty feet then there is concern. Nearly all will say that if a floor slopes 1 and 1/2 inches in twenty feet or more, that there should be further investigation. Floors that slope 2 or 3 inches in 20 feet would be a very serious concern.

How far can a floor be out of level?

Floor slope is not uncommon, especially in homes more than 15 years old. According to the National Association of Home Builders (NAHB), floor slopes less than ½ inch (1.27 cm) over a distance of 20 feet (6.10 meters) are acceptable. Other experts say that anything under 1.5 inches (3.8 cm) is okay.

How uneven can a floor be for tile?

Because each individual tile measures 2 inches or less in size, the tiles are able to move with an uneven surface, going up or down as the surface demands. The more uneven or curved a surface is, the smaller the tile should be to accommodate it easily.

Does floor have to be perfectly level for laminate?

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.

Does concrete floor need to be perfectly level to tile?

Because concrete floor surfaces frequently have small dips and hills, they must be leveled before installing tiles on them. Using a self-leveling floor compound will help ensure that the concrete is completely flat before you lay the tiles.

What leveling compound should I use for hardwood floors?

If you are nailing the hardwood floor in place, choose cementitious leveling compound that you can nail through.

Why do hardwood floors need a flat floor?

Hardwood floors do need a flat subfloor surface in order to prevent them from buckling after installation. Creating a flat subfloor involves lowering the high spots and raising the low ones. Each requires different processes to accomplish.

How to get rid of dust in subfloor?

Sand off the high spots on the subfloor. Remove any rough edges between plywood subfloor joints with the sander as well. Vacuum the dust away with a wet-dry vacuum.

How do I sand a hardwood floor?

Models with dust catchers help minimize dust in the house. Sand off the high spots on the subfloor. Remove any rough edges between plywood subfloor joints with the sander as well.

How do I clean a subfloor?

Clean it well with a wet-dry vacuum. Pound nails into the subfloor with a hammer and set screws slightly below the surface of the subfloor with a screwdriver. Pass a long carpenter’s level or straight board across the floor in all directions. Get down on your knees and look for daylight under the level or board.

How do I level a floor with cementitious?

Stir pre-mixed cementitious leveling compound with a trowel. Spread the leveling compound over the low spots with a trowel. Feather the edges to blend with the surrounding subfloor.

What does "level" mean in flooring?

Hardwood floor installers often use the term “level” when referring to subfloors, when actually they are meaning the term “flat.”. While it’s desirable to have a level floor, most homes have a variance of a fraction of an inch across the width of a room.

What Materials Will I Need To Level Floor For Hardwood?

This is a fast-drying, two-component compound that creates a level floor for your hardwood. It will dry to the touch in minutes and reach full strength within 24 hours so it can be walked on soon after installation.

How To Level Floor For Hardwood in 13 Easy Steps

Measure the width of your room and divide it by two. This will give you an accurate estimate of how many boxes of polyurethane floor leveler you need to purchase for this project, but be sure to buy a little extra just in case.

5 Things to Know Before Leveling A Floor

The first thing you need to know before leveling a floor is the underlying problem that caused it to become uneven. Understanding this will help you determine what type of product can be used for leveling and which tools are needed during installation.

How to Level Floor for Hardwood FAQs

Yes, it is possible to install hardwood flooring on an uneven or unlevel subfloor as long as there are no structural issues present and the ground underneath isn’t soft.

Conclusion On How To Level Floor for Hardwood Installation

At this point in the article, you should have a solid understanding of how to level floor for hardwood installation. Knowing which tools are needed and what type of product can be used is important before starting this project! We hope that these tips and suggestions help you complete your project successfully.

How do I get a wood subfloor ready?

To get your wood subfloor ready, the first thing to do is to make sure the wood sheathing that is on top of the joists is securely fastened. I highly recommend installing coarse-threaded screws in addition to the nails that might already be in place. Be sure to do this in high foot-traffic areas of the room.

How to fill in dips in concrete?

I always use regular roofing shingles to fill in any dips or depressions in wood or concrete subfloors. The overall floor may not end up in the same plane, but if you have just one gentle hump that extends over 10 or 12 feet, the naked eye can rarely detect this imperfection. Dips or depressions in a subfloor are immediately identified using the six-foot long straightedge. Place it at the highest spot in the floor and slowly swing it around in a 360 degree circle. The low spots will be readily visible under the straightedge.

How to identify dips in subfloor?

Dips or depressions in a subfloor are immediately identified using the six-foot long straightedge. Place it at the highest spot in the floor and slowly swing it around in a 360 degree circle. The low spots will be readily visible under the straightedge. You can see all imperfections best in a darkened room.

What does flat and smooth mean?

This means the subfloors themselves are flat and smooth. Flat and smooth doesn't mean that the floor is level . A floor doesn't have to be perfectly level to look superb covered with hardwood strips. Wood floor systems framed with engineered wood I joists, or those made from floor trusses, often are extremely flat or in the same plane.

What happens if you mix leveling compounds wrong?

Also, if you mix some leveling compounds wrong by adding too much water, there is a possibility they can break down over time and turn to powder. These compounds work great if you follow the instructions. Always mix a TEST batch and see how it works. This is a cheap insurance policy.

What is vertical joist?

A vertical-grain joist is one cut from the center of the tree. It would have the small dark round center of the tree in it and the growth bands radiate out on each side until you get each end of the joist. A flat-grained joist is one that's cut from, or near the edge of the tree.

What is crown in wood floor joists?

The crown in a wood floor joist refers to the amount of upward curvature that exists in the framing member as you look down the length of the top edge.

What type of flooring is used in open concept homes?

In some open-concept homes, one can also use different types of hardwood to differentiate specific areas of the home. For example, for the entrance, you may use laminated hardwood but in the hallways, you may have a parquet pattern; this type of flooring also helps complement the design of the home.

Is it wrong to match hardwood floors?

There is no right or wrong when it comes to matching or installing different color hardwood floors; at the end of the day, it is all a matter of personal preference. But by consulting with an expert, he or she may provide a solution that is not only aesthetically better but also cost-effective.

Can you match hardwood floors with other floors?

If you already have hardwood flooring in one segment of your home and you want to match the other floors with the same hardwood floor, this can be a difficult task. The reason is that no matter how similar your hardwood flooring selection is, there will always be a slight difference in tone which will create a mismatch.

Do you have to have the same hardwood flooring in every room?

The fact of the matter is that there is no absolute rule that a home must have the same type of hardwood flooring in every room. In general, most experts state that one does not need to have absolute uniformity in the home flooring but one should consider strategically mixing the different types of hardwoods so they complement each other ...

Can you have different types of hardwood flooring in different rooms?

Some people are adamant that all the hardwood flooring in the home should match and then others say that you can install different types of hardwood flooring in different rooms.

Should Wood Floors Match Throughout The House?

There are many instances when one buys a home that already has one or two rooms with hardwood floors. Further, sometimes a homeowner may be considering installing hardwood floors and wonder if all the rooms should have the same color and style of flooring. The answer to this question depends to whom you speak to.

Why is it important to ensure all subfloor requirements are met before installing hardwood floors?

Because so much is resting on the strength of your subfloor, it is critical that you ensure all the subfloor requirements are met before you install. Here are some factors to consider as you determine whether your subfloor is up to the task of protecting and supporting your new hardwood floors.

What is the subfloor of hardwood flooring?

The subfloor is what lies beneath the planks of solid or engineered hardwood flooring. It’s the foundation that provides a solid place for your hardwood to sit for years to come.

Can engineered hardwood be installed over concrete?

An engineered hardwood can be installed over a concrete, wood, tile and full adhered vinyl subfloors when installed as a floating or glue-down floor. Be sure to read the manufacturer requirements of your subfloor before you begin installation.

Can you install engineered hardwood over a concrete floor?

The first thing to consider is the type of installation. Stapling or nailing your flooring to the subfloor is the most common way to install solid hardwood. With engineered floors, you can also opt for glue-down or floating installations. Subfloors, such as vinyl, carpet, concrete, or ceramics cannot support a solid hardwood installation and should be removed before you install. An engineered hardwood can be installed over a concrete, wood, tile and full adhered vinyl subfloors when installed as a floating or glue-down floor.

Do you have to ventilate a bathroom to install flooring?

If you plan to install your flooring in a bathroom, kitchen, or mudroom, make sure you have enough ventilation to keep your sub floor just as dry as the top surface of your flooring.

Does the grade of flooring matter?

The grade of your flooring matters too. The flooring grade is based on the ground outside. For example, basements are almost always below grade, since they are below ground level.

Can engineered hardwood floors be installed below grade?

Instead, you should consider engineered hardwood floors if you want to install below grade. These floors look similar (if not identical) to hardwood floors, but they offer better protection in below-grade environments. If you’re installing your floors above grade, you must consider the strength of the structure where you’re doing the installation. ...

What type of flooring are you installing?

Before getting started with how to level a subfloor, it’s important to consider the type of finished floor that will be installed over it. Each type of flooring has specific characteristics that affect installation, and some require more finicky prep work to make sure the finished floor looks great.

Why is my floor not level?

Before taking steps to level a floor, you must find out why it’s not level. Leveling a floor can be either a do-it-yourself project or a job for the pros, depending on what’s causing the problem. Often, age-related settling results in an uneven floor, which is likely nothing to worry about. But in some cases, problematic structural issues, including foundation problems, a cracked floor joist, a rotted sill plate (what the joist sit on), or delaminated subflooring cause the floor to be uneven.

How much does OSB subflooring cost?

A 4-foot by 8-foot sheet of OSB subflooring costs about $18 to $22 and the same size sheet of plywood subflooring costs about $20 to $24. When replacing a delaminated subfloor, it’s best to remove and replace the entire sheet that’s damaged, rather than trying to piece-in smaller sections.

What is the best way to replace subfloor panels?

The best remedy is replacing damaged subfloor panels with new ones. The two types of subfloor material, oriented strand board (OSB) and plywood, are both constructed of wood fibers combined with glue and pressed into durable panels that are more than adequate for constructing a strong floor.

Why is my concrete floor height different?

Note: When it comes to concrete floors, height discrepancies are often due to the original concrete finishers not leveling the floor adequately. This is a minor issue and can be fixed using the self-leveling method discussed next.

How much does self leveling compound cost?

This type of floor-leveling is DIY-friendly and costs approximately $1.50 per square foot when applied 1/8-inch thick. Your cost could be more or less, depending on the size of the floor area to be treated and the depth of the low areas.

What is a high area of a floor called?

High areas in the floor are called “heaves” and low areas are called “dips. ”. If you don’t have any marbles handy, you can check for dips and heaves with an eight-foot carpenter’s level. Place the level on different areas of the floor, and notice if it lays flat in all spots.

What is the maximum tolerance for subfloor?

Most experts would agree that the maximum tolerance on a subfloor is 3/16” over a ten-foot span. Any dips and mounds that surpass that amount need to be corrected

What does it mean when hardwood floors bounce?

Depending on the type of hardwood you have, this sound ranges from high-pitched to deep and hollow. A pronounced bounce can also result from lower spots; the floor gives a little more when walked on, only to bounce back with greater force than spots just inches away.

What is flat subfloor?

Flat subfloors produce quiet, well laid floating wood floors. Uneven conditions can be fixed ahead of time, and allow you the greatest enjoyment and value from your flooring investment. For tips on subfloor treatment and finding the best hardwood flooring for each job, call your flooring pro at Unique Wood Floors. Share.

Why is my floating wood floor uneven?

Most problems and issues with floating wood floors are a result of one particular glitch-an uneven subfloor. Although many people assume level subfloors are required under floating wood floors, the reality is a little more complicated. Having a flat subfloor ensures your floating engineered hardwood flooring fits well.

What is the sound of floating engineered wood floors?

You might notice loud and intrusive noises coming from your new floating engineered floors. It could be creaking, squeaking or a hollow knocking sound . All of that racket results from uneven floors. When floating wood floors rest on an uneven surface, and pressure is applied to the top of the flooring, the resulting movement tends to make a noticeable noise. Depending on the type of hardwood you have, this sound ranges from high-pitched to deep and hollow. A pronounced bounce can also result from lower spots; the floor gives a little more when walked on, only to bounce back with greater force than spots just inches away.

How to check if subfloor is flat?

The easiest way to check the flatness of your subfloor is by using a straight 2x4, about 10 feet long. Lay it on the floor and have a look at the edge of the subfloor. This long stretch of wood should uncover any uneven spots, including dips, hills, and gullies.

Can you sand down wood subfloor?

Wood subfloors, on the other hand, can be sanded down to ensure a flat surface ideal for the installation of floating wood floors.

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