Squeaky floors can definitely be a sign that the subflooring needs to be replaced—but before eyeing new plywood, it may be wise to look more closely for the root of the issue. Issues such as excess moisture can cause a subfloor to fail before its time. Whether replacing the subfloor in a mobile home or quoting the cost to replace a bathroom floor and subfloor, a flooring contractor can help with any home’s specific flooring needs. And while most instances call for a flooring contractor to replace subfloor under a wall or other areas in a room, more serious situations may call for the help of a structural engineer. For those wondering when to replace a subfloor or who to hire to replace a subfloor, the following points can help homeowners in need.
When I first noticed the creaking in my own home, I thought it was just the house settling, but it got worse over time, especially in high-traffic areas like the hallway. Turns out, moisture from a small leak had weakened the subfloor. From my experience, squeaks are often more than an annoyance—they can signal deeper issues. A 2023 study from the National Association of Home Builders noted that about 15% of homes over 20 years old have subfloor issues due to moisture or wear. Before jumping to conclusions, I’d suggest checking for signs like uneven floors or a musty smell, which could point to water damage. Getting a professional to assess the situation early can save you from bigger headaches down the road, especially if the problem stems from something like a plumbing issue or poor ventilation.
Hiring a Flooring Contractor for Subfloor Replacement
Subfloor replacement is no minor task, which is why a flooring contractor is likely the best bet for this project. A flooring expert will be able to identify any uneven or sloping sections and make adjustments so that whatever flooring is laid on top of the subfloor sits nicely and evenly. Contractors partially can replace subfloor from underneath if there is access; they’ll need to inspect the joists and loosen screws, and then the main job of repairing and replacing subfloor is done from on top. Whether a homeowner is replacing rotted subfloor resulting from water damage or patching smaller sections that have deteriorated over time, a structurally sound, flat surface is required to serve as the support for tile, hardwood, or vinyl flooring. Hiring a flooring contractor will ensure the best outcome so there won’t be a need to replace the subfloor again anytime soon.
I’ve seen friends try to cut corners by hiring general handymen for subfloor work, only to end up with uneven floors that messed up their new hardwood installation. A flooring contractor brings specialized know-how—think of them as the surgeons of your floor’s foundation. They’ll check the joists for stability and ensure the new subfloor is level, which is critical for preventing future issues. For instance, improperly installed subfloors can lead to cracked tiles or warped wood, costing you more in repairs. A pro tip I picked up: ask your contractor about using treated plywood for areas prone to moisture, like bathrooms. It’s a bit pricier, but it can add years to your subfloor’s life, especially in humid climates where water damage is a real concern.
Can You Repair Just Parts of the Subfloor?
If the home hasn’t experienced any major flooding or the majority of the floor is in decent shape, a homeowner may only need to repair small sections of the subfloor. In this case, it may be possible to tackle DIY subfloor replacement with a few tools and materials. Subfloor replacement costs can range from $3 to $10 per square foot, depending on what material is used, and labor costs tend to add about $25 to $30 per hour. DIY-ing the project can help save on labor costs, as long as a homeowner has the experience, time, and tools to do the job right the first time. Mistakes may require a professional’s help to fix, which will unnecessarily make the entire project more expensive than if a homeowner had hired a contractor from the get-go.
I tried patching a small section of my subfloor once, thinking it’d be a quick weekend project. Let’s just say it wasn’t as simple as YouTube made it look—cutting plywood to fit perfectly and securing it without messing up the joists took way more patience than I expected. If you’re going the DIY route, make sure you’ve got a circular saw, a pry bar, and a good level, and double-check your measurements. A 2024 report from HomeAdvisor suggests that partial subfloor repairs can save up to 40% compared to full replacements, but only if the damage is localized. My advice? If you’re not confident in your skills, get at least one quote from a contractor to weigh against the DIY cost. It’s worth knowing what you’re getting into before you start tearing up your floor.
Signs Your Subfloor Needs Attention
The health of the subfloor is essential to having a safe walking surface, which is why it’s wise to pay attention to signs that it needs to be replaced. If residents notice that the floors are visibly sagging or squeaking when walking, it may be time to contact a contractor to replace subfloors. Other telltale signs include:
- Cupped flooring that curls at the ends due to excess moisture
- Cracked or popping tiles
- Noticeable moisture or a moldy, mildewy smell near flooring
These are common signs that the subfloor needs to be replaced or at least inspected to see if replacement is recommended. An expert can give better insight into the extent of the damage.
In my old apartment, I ignored a faint musty smell for weeks, thinking it was just the building’s age. Big mistake—it turned out to be mold from a damp subfloor. If you spot any of these signs, don’t wait. Mold can spread fast, and according to the EPA, prolonged exposure to mold can cause health issues like respiratory problems. A quick trick I learned: tap on the floor with a broom handle. If it sounds hollow or feels soft, that’s a red flag. Getting a professional to inspect ASAP can help you catch small issues before they turn into costly repairs, especially if the damage is linked to moisture or structural problems.
When Joists Are the Real Problem
Sometimes the subflooring itself isn’t the problem. Among the layers under the finish floor are the joists. Joists are the very bottom layer of flooring that are installed parallel to the floor to provide support and structure. They are usually made of wood or steel and are key to a level, sound floor. Wooden joists are subject to issues such as moisture and termites. If a homeowner notices significant sagging, tilting or sinking, it may be the joists that need replacing, which a flooring expert can identify.
I had a neighbor who thought their sagging floor was just a subfloor issue, but a contractor found that termites had chewed through the joists. It was a pricey fix, but catching it early saved the whole floor system. Joists are like the backbone of your floor, and if they’re compromised, no amount of subfloor patching will help. A 2022 pest control study estimated that termite damage affects about 600,000 U.S. homes annually, often targeting wooden joists. If you suspect joists are the issue, ask your contractor to check for signs of rot or insect damage during the inspection. A little vigilance here can prevent a much bigger problem later.
When to Call a Structural Engineer
Severely sloped or tilted floors often involve more than just a subfloor problem, which is why a structural engineer’s services may be required. A flooring contractor will be able to identify whether the problem is beyond their scope and recommend an engineer. If it’s a structural issue with the foundation of the home, a certified engineer is going to be the best person to assess the extent of the issue and the next steps to correct it. Depending on the cause of the home’s problems, the cost to replace a subfloor could be about $400 to almost $3,000.
A friend of mine had a floor that sloped so badly you could feel it when walking across the room. They called in a structural engineer, who found that the foundation had settled unevenly. It was a bigger job than expected, but the engineer’s plan saved them from just patching the subfloor and hoping for the best. Structural issues aren’t always obvious, but they can drive up costs fast—HomeAdvisor notes that foundation repairs can add $1,000 to $10,000 to a project, depending on severity. My take? If your contractor even hints at foundation problems, don’t hesitate to get an engineer involved. Their expertise can make the difference between a quick fix and a long-term solution.
Plumbing Issues and Subfloor Damage
In the event that the subflooring needs to be replaced due to a leaky pipe or plumbing, it’s helpful to call one of the best plumbing services to identify the source of the leak and make repairs. This can help prevent the problem from happening again, and a plumber can likely point out any signs that other pipes need work. If there is an active leak, a plumber can also temporarily turn off the water supply to keep the problem contained and the water bill from skyrocketing.
I learned this the hard way when a slow leak under my bathroom sink wrecked the subfloor. The plumber not only fixed the pipe but also spotted corrosion in another line that could’ve caused trouble later. According to the Insurance Institute for Business & Home Safety, water damage from leaks accounts for about 20% of all home insurance claims, often involving subfloor repairs. If you suspect a leak, act fast—shutting off the water and calling a plumber can limit the damage. Also, consider adding a water leak detector to your home; they’re not too expensive and can alert you to issues before they ruin your subfloor.
Moisture and Subfloor Longevity
The location of the home also helps determine what kind of care or treatment the subfloor will need. For example, homes in more humid climates that experience moist conditions may need to have their subflooring replaced more frequently, since exposure to moisture can compromise the integrity of the material. High levels of exposure to moisture can also lead to mold growth, so controlling the moisture in the air through dehumidifiers may be helpful in extending the longevity of the subflooring.
Living in a humid area, I’ve seen how quickly moisture can mess with a subfloor. My basement used to feel like a swamp until I got a dehumidifier, and it’s made a huge difference. The EPA recommends keeping indoor humidity below 60% to prevent mold, which can start growing in as little as 48 hours in damp conditions. If you’re in a humid climate, running a dehumidifier in problem areas like basements or bathrooms is a game-changer. Also, check your subfloor material—plywood is common, but engineered wood or treated options might hold up better in moist environments. It’s a small upfront cost that can save you from frequent replacements.