How To Replace A Rotted Subfloor: 57 Facts

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57 Facts How To Replace Rotted Subfloor | How To Repair Water Damaged Subfloor

• You might think that replacing the rotted wood would be easy — just cut out the damage and patch it. But unfortunately, rot usually occurs in hard-to-reach places — under the toilet, next to the vanity, under the kitchen sink or along a wall. The job gets tougher when radiators, sinks or other fixtures have to be moved. - Source: Internet
• A quick inspection of your subfloor might reveal all there is to know about your problem, and the least invasive method is usually best. There may be a point where it’s necessary to remove a finished floor to truly understand the severity of the issue so be sure to understand that ahead of time. In the case of a dry subfloor with cracking tiles, it’s almost certain that you’ll need to remove the tile to come to a resolution. - Source: Internet
• Use chalk to mark and map areas that need repair. These guides help you make accurate cuts through the damaged subfloor. You want to measure and outline beyond affected areas and close to adjacent floor joists. - Source: Internet
• Subfloor water damage repair costs depend on the size of the room. Materials are another factor. Most subfloors are plywood, but others are constructed with oriented strand board. You also have to consider how water damage complicates the job. - Source: Internet
• “A toilet moves because the subfloor has become so decayed that it no longer securely anchors the fasteners that hold it to the floor,” says Shepard. Often, the moisture damage is from a slow leak in your toilet’s pipes. Since it will only worsen with time, it’s important to get it fixed ASAP. - Source: Internet
• Because tile is inflexible, it requires a strong, rigid surface beneath it to prevent it from cracking. If you notice cracks in your tile floor, it may mean the subfloor isn’t firm enough to hold it up and will need replacing. Keep in mind that when installing tile over plywood or OSB, there must be a cement backerboard between the tile and the panels. - Source: Internet
• A water-damaged subfloor feels spongy underfoot. It might bounce or squeak when you walk across the room. Sagging boards, damp spots and unpleasant musty smells are also signs of a rotting subfloor. - Source: Internet
• Subflooring is one of your home’s most important architectural components. It supports the first floor by securing the floor joists that span your basement or crawl space. The subfloor forms an underlying plane that holds up walls and serves as a level foundation for finished floors. - Source: Internet
• Fasten a 2x4 to the damaged joist with 3-in. galvanized drywall screws to supply a solid, flat nailing surface. Toenail or screw 2x4 blocks to the joists to support the edges of the subfloor and the waste flange. - Source: Internet
• Loosened nails. As mentioned earlier, squeaks are caused by the subfloor rubbing against nails. These nails work themselves loose as a subfloor ages and sinks, despite retaining its structural integrity. Fixing this scenario can be as easy as running some extra screws through the subfloor and into the floor joists below. - Source: Internet
• Remove the subfloor to gain access to the joists beneath it. To do this, you can use a pry bar or a chisel and hammer to gently lift the flooring. You’ll also need to remove the screws first. - Source: Internet
• It’s difficult to know everything that goes on below your flooring. Underneath the hardwood, laminate, tile, or carpet lies the subfloor, and it’s a component that only gets attention during a full-scale renovation or a full-blown problem. Even some of the telltale signs are easy to ignore. By the time that the issue becomes apparent, it might be too late for your subfloor. - Source: Internet
• In cases of extensive water damage, drying the subfloor after a flood can be very difficult, and that complicates repairs. Soaked wood quickly develops mold and rot that impacts adjacent framing and drywall. In this kind of situation, it’s best to replace the entire expanse. Often, homeowners insurance covers subfloor replacement after water damage. - Source: Internet
• Subflooring can last a very long time. Under normal conditions, a subfloor can last as long as the house itself. However, should a subfloor be damaged or defective, it may only last 20 to 30 years. Should this be the case, a homeowner might need to peel back the layers of flooring and get to work. Here are five signs it’s time to replace a subfloor. - Source: Internet
• To be clear, a leaking ceiling is not your subfloor’s fault. But it may be an indication that your home has a slow leak. Since plywood and OSB tend to absorb moisture, by the time water has leaked through the ceiling, it could mean the materials are completely soaked through. In addition to calling the plumber, you may want to call a flooring professional to check for subfloor damage. - Source: Internet
• Fasten the new subfloor patch in place, screwing all edges, including the old floor, to joists and 2x4 blocks. Use 1-1/2 in. screws spaced every 6 in. - Source: Internet
• NOTE: if you find that more than 15-20% of your subfloor has major damage, you should seek the help of a qualified RV repair shop. This is because damage to that extent can impact the structural integrity of your camper. In most cases, however, the damage will be less and you’ll be able to do this yourself. - Source: Internet
• Measure new subflooring material, and cut it to fit. Allow a one-eighth inch gap between old and new subflooring so that the new material can expand. Use deck screws or 8d galvanized nails to fastened down the new subflooring. - Source: Internet
• If the bounce and squeak is caused by a broken floor joist, sistering or laminating a new joist to the old broken one is a good option. It can be a challenge to maneuver a joist into place over a bearing wall on one side and a top plate on the other, so employ the help of a friend. Once in place alongside the broken joist, glue and screw the new joist to the old broken one. Screw the subfloor material down to the new joist, and say goodbye to that bounce and squeak. - Source: Internet
• An occasional spill isn’t enough to damage a subfloor. However, just one gallon of water can penetrate a floor’s covering and soak the wood structure below. Multiply that small amount by any of these home mishaps and plumbing disasters that cause water-damaged subfloors. - Source: Internet
• Remove the subfloor section to eliminate all soft, rotting wood. Pull nails before cutting along joists. Allow rotted areas to dry out, then apply a coat of wood preservative to damaged and discolored areas. - Source: Internet
• There’s also a chance that your subfloor suffered water damage and has since dried itself out. If that’s the case, the subfloor might be fine as far as mold and moisture are concerned but still feel a little soft. To remedy this situation, cut a piece of joist material (2×8, 2×10, or 2×12 depending on the circumstances) to fit crosswise between the two joists under the soft flooring. Drive some screws through the joists and into the ends of the new board you’re installing. This will add all the structure necessary to stiffen up the subfloor. - Source: Internet
• It depends. Above grade, hardwood, carpet, laminate and other floor coverings need a plywood or OSB panel subfloor, as they cannot be installed directly to floor joists. Below grade, a plywood or OSB subfloor is optional, depending on your choice of flooring. Floating laminate, engineered hardwood, tile and carpet can be installed directly on a concrete subfloor if the proper moisture barriers are in place. - Source: Internet
• A subfloor is the solid material beneath your floor covering. It is attached to your home’s floor joists and acts as a base for your finished flooring, such as carpet, hardwood, laminate, tile, etc. Typically, a subfloor is made of plywood or oriented strand board (OSB) panels. - Source: Internet
• Cut through the vinyl and underlayment along the tub with your power saw, finishing the cut with a chisel at the ends. Then pull up the entire underlayment and vinyl. Probe again with a screwdriver to determine the extent of rot damage to the subfloor. When cutting out the rotten sections, plan the saw cuts so they fall on the center of joists. - Source: Internet
• Now that you have access to the floor joists, take a look at all of them to determine whether or not they need replacing. If so, mark the ones that need replacing with a pencil or a piece of painter’s tape. You’ll also want to get the measurements for the joists as well. If the joists are simply wet but not damaged, give them 24 to 48 hours to dry completely before replacing the subfloor. - Source: Internet
• Lower the piece of subfloor you just cut into the opening, screwing it into the joists below. This is also a good time to screw as much of the original subfloor down as you can. Screws hold much better than nails and won’t start squeaking. - Source: Internet
• After you remove the flooring, take a good look at the subfloor. Is it damaged or rotting? If it is, you’ll want to remove it as well. To do this, you can use a hammer or screwdriver to remove the nails or screws for the subfloor and then a pry bar to lift the plywood panels from the joists. Make sure that your new subfloor panels match the previous panels in thickness and size. - Source: Internet
• Issues with a subfloor become far more apparent when walking through a living room feels more like a stroll through rolling hills. If a floor begins to sink between floor joists, it’s a sure sign that there is an issue. This is commonly caused by moisture issues deteriorating the wood, but it can also be caused by improper installation. When subfloors are installed, any end-to-end joints between boards or sheets are supposed to meet on top of a floor joist. Should that joint be off by only an inch, over time foot traffic will cause the end of the sheet to sink. - Source: Internet
• After you have installed the subfloor, it’s time to add the new flooring. When installing the new flooring, be sure to work your way backward, starting at the area farthest away from the door. You’ll also want to keep a circular saw or a tile cutter handy, depending on the type of flooring material you have–just in case you need to make any last-minute cuts. - Source: Internet
• Subfloor damage is typically caused by overexposure to moisture. This could be from excessive humidity, a leak in your plumbing or a crack in your home’s exterior. While the thought of replacing it might give you a sinking feeling – literally – knowing when it’s time to replace your subfloor will allow you to head off more serious problems. - Source: Internet
• Set a circular saw to the same depth as your subfloor, usually 3/4 inch. Cut the square out of the subfloor. Make sure to cut around the nails or screws so the remaining subfloor will remain attached to the floor joists. - Source: Internet
• Pull up water-damaged subflooring with a pry bar. Minimize splintering by working slowly. Remove any loose nails, and dispose of everything in heavy-duty trash bags. Use a shop vac to clean up remaining dust and debris. - Source: Internet
• Clearly, water is a floor’s mortal enemy. If there’s been water sitting in between the finished flooring and subfloor, there’s a good chance there’s some damage. If there was a leaking drain in the wall or a leaky sink nearby, or if there was a section of the roof that was leaking during the last storm, your subfloor might’ve taken on some water, and it’s time to investigate the extent of the damage. - Source: Internet
• After you set your saw you will carefully cut only the subfloor. Use caution so you don’t cut a joist. Here’s a video showing how to use a circular saw to cut out subflooring in a mobile home: - Source: Internet
• “A subfloor’s lifespan depends mostly on the materials used and the amount of moisture they’re exposed to,” says Shepard. “Adequately protected from moisture, most subfloor materials can be expected to last for the lifespan of the home.” - Source: Internet
• If you’ve decided it’s time to replace your subfloor, make sure to fix the source of your subfloor damage as well. Without addressing the root cause of the damage, you’ll eventually need to replace your entire subfloor all over again. Be sure to check nearby pipes, exterior vents and appliances for leaks, and have a disposal plan for any water-damaged materials you come across. - Source: Internet
• For example, if your bathroom has vinyl or laminate flooring, it will be cheaper to replace it than hardwood flooring. And if the subfloor and joists beneath it also need replacing, this will cost anywhere from $1.50 to $4 per square foot for materials. Labor costs can range anywhere from $10 an hour to $28 an hour, depending on where you live. - Source: Internet
• Replacing floor joists is necessary if they have become rotted from water damage. Keep in mind that attention to detail and accuracy are crucial to the safety of the floor once the joists are installed. Let’s look at the steps to do it. - Source: Internet
• Replacing a rotted bathroom floor should be a top priority. Not only can the floor become a safety hazard, but it can also spread to the ceiling of the floor beneath it. But what’s the best way to go about replacing the floor? We’ve researched the steps to remove and replace the floor, and in this post, we will share them with you. - Source: Internet
• Measure the opening’s dimensions with a tape measure and transfer the dimensions to a new piece of subfloor. Use these measurements to draw a square on the subfloor that will fit tightly inside the opening. Cut the square out with a circular saw. - Source: Internet
• “By far the most common cause of subfloor damage is moisture. Common sources are plumbing fixtures, especially toilets and tubs-with-showers, but also any areas with sinks or appliances that are likely to leak, including bathrooms, kitchens, and laundry rooms. Other less common causes are fire and impact.” Kenton Shepard | Director of Green Building, InterNACHI - Source: Internet
• There aren’t many things in a home more beautiful than a well-maintained, well-polished hardwood floor. Even a small area of cupped floorboards can take away from the pristine appearance. Cupping occurs when hardwood floorboards begin to curl along the length of the board, somewhat like a taco shell but less pronounced. It’s most often caused by moisture. The moisture issue probably isn’t being caused by the subfloor but if the hardwood flooring above is cupping, it’s a safe bet that the subfloor is suffering as well. - Source: Internet
• Assess the damage and cut around it, then remove the damaged subfloor. When you replace the subfloor, the new ends have to sit on the joists, so cut out your wet subfloor along two joists on either side of the damage. Make sure to get all of the damaged or moldy subfloor to prevent it from coming back. Also, keep the cut as square to the joists as possible—this will save you a headache in the next step. - Source: Internet
• A rotted bathroom floor is typically caused by hidden water damage that slowly eats away at the floor and subfloor beneath it. This damage can also cause the joists beneath the subfloor to lose their integrity or become unstable. Continue reading to learn more about how to repair these issues. - Source: Internet
• A subfloor is the structural sheathing that spans the floor joists. It’s almost always completely hidden under some type of finished-flooring material. Depending on when a home was built, a subfloor could be made from softwood boards like pine or fir, plywood, or OSB (oriented strand board). OSB is a composite of glue and strips of scrap wood, in sheets 4 feet wide and 8 or 12 feet long. OSB is fast to install and less expensive than real wood or plywood, making it the go-to material for modern subfloors. - Source: Internet

• Major damage = Major damage happens when water is allowed to sit on a sub-floor for a long period of time. When left unattended, this will cause your subfloor to get mushy and eventually cave in. That’s when sub-floor surgery becomes your only option. - Source: Internet

• The next step is to remove the flooring in the bathroom. This process will vary depending on the material of which your flooring is made. If you have hard stone or tile flooring, the easiest way to remove the floor will be to use a pry bar or a chisel and hammer. If you have laminate or vinyl flooring, you can use a prybar to lift the floor initially and then use your hands to pull the pieces away from the subfloor. If you have a hardwood floor, a prybar or a chisel and hammer will work best to remove the flooring. - Source: Internet
• If you’ve had a recurring leak, your floor joists might be rotted and weakened, too. In that case, you’ll have to insert an entirely new joist and screw it to the solid wood of the old one. This can be a big project – you may have to open more floor to insert the new joist, move electrical or plumbing runs, or raise a sagging floor. If you’re unfamiliar with these complications, hire a professional carpenter to help out. - Source: Internet
• Find the floor joists closest to the damaged area – Before you cut out the bad flooring, you need to be sure you’ve got something to fasten the new flooring into. Your sub-floor will generally be screwed into floor joists which will be either metal rails or wooden beams. By looking at your subfloor closely, you should be able to see where it’s been screwed into the floor joists. - Source: Internet
• Draw a square around the damaged subfloor to mark the portion to remove. Look inside the square for any nails or screws. These indicate where the floor joists run. Extend the square’s sides to the nearest floor joists on both sides to form a slightly larger square. - Source: Internet
• It only takes a minute to wipe up spilled coffee on the kitchen floor. It can take days to recover from water damage after a burst pipe or storm flooding. As you work through the job of cleaning carpets and fixing hardwood floors, you have to be concerned about your home’s subflooring. - Source: Internet
• Maybe you noticed a soft spot under the carpet. Or maybe your floorboards are squeaking a little louder than usual. Either way, you’re left wondering: “is it time to replace my subfloor?” - Source: Internet
• “Exterior doors that are poorly installed can fail to protect subfloors from rain and snow, and it’s not unusual to find decay in these areas when inspecting crawlspaces and basements. Especially in warmer climates, crawlspaces that experience seasonal flooding can raise relative humidity to a level at which particle board can experience some deterioration.” Kenton Shepard | Director of Green Building, InterNACHI - Source: Internet
• This area can be used to fill any gaps with a flooring compound that you can sand down. However, if the floor is already level, you won’t need this space. It’s best to use a level to make sure the subfloor is even before installing the flooring. - Source: Internet
• Does a wet subfloor need to be replaced? No. If you can begin the drying process immediately after the initial water damage, you may be able to avoid subfloor replacement. It’s best to let restoration professionals address the existing damage. Their assessment gives you an accurate overview of your options. - Source: Internet
• Set the square into the opening. Secure it in place with 1 1/4-inch wood screws into the floor joists. Slide the exterior door threshold back into place and secure it to the new subfloor with nails or the screws you had backed out in Step 1. If you removed the toe kick, nail this back into place. - Source: Internet

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