Waxing may make engineered hardwood The first grit is meant to take off any finish, the next is to smooth out the pattern of the first grit, and the final grit is meant to smooth out any remaining sander marks and provide the finishing touches. The edger is basically a sanding disc mounted on a big, powerful motor. Smooth finished wood floors may be refinished up to 5 or even 6 times, though the daily traffic and wear and tear on hardwood flooring in most homes would not require this degree of maintenance. floors look yellow and could prevent you from recoating the floor in Smooth finished wood floors may be refinished up to 5 or even 6 times, though the daily traffic and wear and tear on hardwood flooring in most homes would not require this degree of maintenance. Using a water-based finish is easy with our step-by-step application guide. Tilt the machine backward, rotate it, and go back in the other direction. Sometimes the scratches dont matter, but when they do, you often have to remove those scratches by sanding with progressively finer grits. Its a big job that creates big disruptions in your household. If the floor is in good shape, start with the most common sequence, which is 40-60-100. - Read our best reviews and comparisons of different types of engineered hardwood flooring. Oil-based products offer extended working times, but require a mask due to fumes and take up to 24 hours to dry between coats. and let The Good Guys get it done for you! Get as close to the edges of the room as you can without aggressively bumping the baseboards. 2420 McIver Lane, Ste 102Carrollton, TX 75006, Use left/right arrows to navigate the slideshow or swipe left/right if using a mobile device. If this is the route you choose, you have two options: oil-based and water-based polyurethane. Thoroughly sweep and vacuum the flooring and then follow up with a tack cloth to remove all the dust that you can. Sanding against the great means that soon or later the floorboards of engineered wood will start struggling with and experiencing wear and tear and other issues that can grow major and even later require for costly and time-consuming repair services. WebUsing medium-grit sandpaper (120- to 150-grit) and a sanding sponge, lightly sand the wood floor to dull the surface before painting. Sure, theyre easier to use, but theyre just not aggressive enough to bite into finishes or hardwoods. Have the necessary tools for this how to sand hardwood floors DIY project lined up before you startyoull save time and frustration. However, the amount of times an engineered floor can be refinished depends on the thickness of the top layer or the veneer. For example, use the drum sander at 60-grade paper, then the edger with 60 grade, before changing to 80 grade. Safety Tip: Store and dispose of oil-soaked rags properly. The natural oxidation that occurs as oils evaporate from a pile of rags can cause a fire under the right conditions! Pet stains are darker (deep gray, almost black around the edges) and often look like a map of Indonesia, with big and small islands covering a large area. Because coarse and fine sandpaper grits are used differently, manufacturers established grades each consisting of one or more grit numbers to help consumers decide which type fits a particular purpose. Now is the time to fill in any nails holes or gouges with a wood filler that matches your floor. Make sure to do this in an inconspicuous location. Avoid last-minute shopping trips by having all your materials ready ahead of time. Thanks for any advice you can give me! This grit should remove all over wood and make the floor flat. still clean them regularly. The usual wear and tear in combination with foot traffic can dull your floors. A solid rule of thumb is that a typical solid hardwood floor can be refinished four or five times before it needs to be replaced, so if you know your floors history, you may not need to measure its remaining thickness. Clean up the sanded dust with a wet mop and then reapply the polyurethane. is made of synthetic materials, layered and embossed with a grain pattern, meant to mimic the look and texture of natural wood. These methods are a long shot, however, and are not recommended by the flooring experts at The Good Guys. 36-grit is typical, though you can use anything between 30 and 40 grit. Can take out the scratch from 120-grit or 100-grit sandpaper if necessary. For example, if youd like the finish grit to be 80, your sequence can be 36-50-80. To detect nails drag a metal snow shovel across the floor (upside down). Remove debris on the floor with a vacuum cleaner or mop. So says our expert, Kadee Macey, owner of Petes Hardwood Floors in St. Paul, Minn. Then clean it off with a brush or vacuum and damp cloth, and apply polyurethane (see later in this article for a comparison of oil- and water-based polyurethane options). If you do sand at an angle to the grain, be aware that you're removing a lot more wood than if you were working with the grain. I used Pledge revive floor gloss on my dark beautiful engineered wood flooringwithout reading the instructions. Coarse grits progress from 24 to 30 to 36, while fine ones rise from 600 to 800 to 1,000 and beyond. You need a pristinely clean floor before sanding, so sweep it and then dust mop it to get up all debris and dust. You don't have to be a professional Scratches are more visible on fine-grained wood like birch or maple, so I go to 100-grit. If you dont sand deep enough, youll end up with a dingy floor.. Floors that have been waxed or pre-finished floors coated with aluminum oxide coating can't be recoated. A dull edging disc is even worse, since it wont remove the ugly cross-grain scratches left by the previous disc. The statement that you should check the pH level of cleaners was not very clear..what level is safe? 80-100: fine Let it dry, and try gently scraping it with a coin or other metal object. Not bad for a weekend of work. Norton Neon 100 Grit 10 Inch (9-7/8 x 29-1/2) Floor Sanding Belts. Cookies are pieces of information stored on your computer in simple text files which our server can read and record. Tip: If you choose not to stain, apply a sanding sealer before the polyurethane finish. Spot sanding and touching up is very difficult to blend back in. But the dull paper isnt cutting deep enough to remove the scratches left by the previous grit. Hiring a pro costs from $3 to $4 per sq. Start by removing the shoe molding -- also called quarter-round -- around the entire perimeter. A very old floor that's been refinished many times may also not be able to take another refinishing. Ive helped hundreds of homeownerssome of them complete DIY novicessuccessfully prep their floors for a new finish. The prep work will take longer than you think. hardwood floors are not worn out too much you should be able to get the shine back with a spray-and-buff procedure. Consequently, grit numbers increase by standard intervals. Keep the buffer in motion at all times to avoid leaving any marks. Then clean it off with a brush or vacuum and damp cloth, and apply polyurethane (see later in this article for a, Uh Oh! Then hand-sand them out with 80- or 100-grit paper. WebREPEL Hardwood. Drum sanders are very aggressive and can be difficult to control, so they are typically not recommended for DIY beginners. Im not sure what to do. Heres a list. You may even want to finish with a rag dampened with mineral spirits. If you have newer baseboards and no quarter-round, leave it in place, but expect lots of the aforementioned touch-ups. A paper thats too coarse will leave the surface scratched and damaged, while one thats too fine wont do the job. The floor will accept the finish evenly and look great. A couple coats of new finish are then On most of my jobs, the sequence is 24-36-60-80 for coarse-grained wood like oak. Remove all window coverings and any art on the walls (unless you want to clean them later). Refinishing Hardwood Floors: a Satisfying Detail That Can Transform a Room. The most common DIY mistake is timid sanding. Repels Water. That makes graceful stops and starts easierand reduces gouging. Clean the entire floor by vacuuming up debris and mopping the space. Once youve selected two areas and taped them off, get a 120-grit screen and thoroughly sand the area. Sand the center of the room first, and then finish with an edger. NTBELT978X2912G100NEON. Next, sand the floor with a medium-grit sandpaper, such as 50 or 60 grit. This sander is easier to handle than a drum sander and eliminates directional scratches. Knowing the square footage will help the crew at the rental store estimate how many sanding belts and discs youll need. To begin, use a coarse 30-40 grit, then a medium 50-60 grit, and finally a fine 80-100 grit. Make sure to keep track of where the holes are, and if you find any other imperfections keep track of those as well, so you can fill them in after your first round of sanding. The grades and grits youll find at hardware stores include: We are no longer supporting IE (Internet Explorer) as we strive to provide site experiences for browsers that support new web standards and security practices. Find two areas on your floor and tape off a square of about 6 by 6 inches The first should be an area that represents the heaviest flaws you have in your floor to see if theyre repairable with a recoat. Art Prints, White Propeller Ceiling Fans Without Lights, Limit the Use of My Sensitive Personal Information, Do Not Sell or Share My Personal Information. Types of sandpaperCoarse sandpaper. Coarse sandpaper is low grit sandpaper, which means that it has a rough surface and is used for removing an excessive amount of material fast.Medium sandpaper. Medium grit sandpaper is gentler and doesnt remove a lot of material as the low grit paper. Fine sandpapers. Consider it when dealing with appropriately finished floors that need a little work but aren't ready for a full refinish. Nail down any loose boards with finish nails. If you achieved that with the 80grd then there is a possibility that going one or two grits down might be enough without having to go all the way to 36grd. Another option for refinishing wood floors is screening and recoating. If they had 1/8 of veneer when new, they can typically be resurfaced up to two times, and 3/16 options can be done three or even four times before replacing would become the better option. tricky process so you may need to hire professionals. Vinegar is acidic, so it could also hurt the finish. Many manufacturers recommend removing excess stain as you go, usually a few minutes after application. Use a floor edger or small orbital sander to sand corners, edges and small areas such as closet floors, bathrooms or stairs. The second should be in an area thats regularly exposed to cleaning products, such as window cleaner overspray, oil-based cleaners, or other heavy detergents. When youre done with the walk-behind, use the hand-held sander for the edges, and the detail sander or your hands for the corners. Because it has so many uses, its not surprising that sandpaper comes in multiple forms. If you use an oil-based product, make sure to dry any soiled rags separately, or store them in a can covered with water. Medium and fine grits are available on 9- x 11-inch paper or cardboard sheets, or on precut backings for machines like detail or random orbital sanders. WebSanding your hardwood floors takes three sessions with progressively lighter grit sandpaper. Thats tedious and often leads to chatter marks on the floor. Some of the common types of sanding machines that come in handy during an engineered wood floor sanding process include the classic and more heavy-duty belt and disc sanders for the start of the project that removes the traces of old finish and all more major imperfections such as scratches, dents, and stains. This method is a bit risky though; the baseboards may have been replaced when the floor was previously refinished for aesthetic reasons, and you still wont know the current thickness of the floor. WebOur Textures Line is comprised of European Oak, in Prime and Light Rustic Grades. Deziel has also published science content and is an avid musician. Even the best abrasives throw off a few granules while sanding. But its really not that difficult. Complete this simple form to get started. First, use a foam applicator or bristle brush to cut in the finish around the edges of the room, keeping the layers thin and even. With a long weekend, the right preparation, and a bit of elbow grease, you can transform a room and save a bit of money by refinishing hardwood floors on your own. Always wear a dust mask, safety goggles and ear protection when using a drum sander. Consider three coats of oil-based finish or four coats of water-based finish. EXPLORE COLLECTION. Repairing hardwood floors can be a daunting task. Consider floor care and refinishing tool rental to get your project done. Medium (80-grit): This is often the first grade chosen when going through the grits to prepare wood for finishing. If you want to change or improve the floor color, apply a stain. Follow up each phase of drum sanding with edging. But trust me. The higher the number, the finer the grit. The top of each plank is 100% wood, available in a variety of species and on-trend styles. However, Label the base shoe as you remove it to avoid confusion when you reinstall it. Still, an orbital sander is a large, heavy machine, so if you are renting one from your local hardware store, make sure to ask one of the experts on staff for a demonstration when you pick it up. Dry it If the floor is old, very hard, or has residual finish, it can be a bit trickier to determine the right sequence. Tape plastic over ducts to keep sanding dust out. We have a hardwood floor with a red oak finish. Its This grit takes out the scratch from 36-grit sandpaper, but does not remove much wood . Compatible with the 12" Galaxy BD-12 belt drum combo sander. There is no need to use any fancy or oil. Youll also be tempted to polish out swirls with a random orbit sander. After sanding, fill in holes in the floor with wood putty or wood filler. should consider screening and recoating them. Bleach formulated for wood floors may be worth a try, but in my experience the results are mediocre at best, and at worst, the wood is left pitted and blotched. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Don't use cleaners which contain wax A somewhat simpler option is a water-based finish that dries clear and doesn't produce the same volume of toxic fumes. If 24-grit doesnt remove at least three-quarters of the finish in one pass, go to 16-grit. A solid hardwood floor with. Sweep and vacuum the flooring to remove dust and debris between sanding with different grades of grit. are made of a solid plank of wood and are therefore the best candidate for refinishing. When youre done, make sure to tape off any floor registers so they wont get scratched if your equipment bumps into them. After youve finished with the sanders, the floor will look so good that youll be tempted to skip this step. attract even more dirt. Check it out! When refinishing an engineered wood floor, it is not recommended to machine- or hand-scrape the finish, due to their thinner wear layers. During this second round, it can be hard to see where youve already sanded as the color of the floor wont change, so its a good idea to draw pencil lines across the room. Our engineered hardwood products reflect generations of experience, dating back to our roots making solid flooring for many decades before Choose a protective coat of wood finish, weighing the following factors. Even at 3mm, if the floor is lumpy, you risk sanding through to the ply substrate. Be sure to dust mop and remove all dust before applying the second coat. Edge or detail sanders come in handy for reaching to all corners of the room and other areas that are hard to access. Note that there are other grits available, including 30, 40, 50, and 120. Hardwood floors can last for the life of a home. Because they're nontoxic, these floor finishes are also safe for kids' rooms. Either way, the abrasive to use is 120- or 150-grit sanding screen (again, just like the stuff used on drywall). Apply the finish with a lambs wool applicator in smooth, even lines while avoiding drips. The best way to know if your floor should be recoated or refinished is to run a simple test. This might seem simple, but there are many varieties of flooring that masquerade as hardwood but are really partially or entirely made up of other materials, and each one requires a different refinishing technique. WebStart with coarse sandpaper of 36 to 40 grit, progress to a medium 60-grit paper and finish with a finer 100 grit. Complete with reviews and comparisons! Removing the base shoe sidesteps both problems. Hang the rags outside, away from any structures, and allow them to dry thoroughly before disposing of them. How to Install Vinyl Plank Flooring on Concrete Step-By-Step Guide, Tips and Tricks on How to Clean CoreTec Flooring, Removing Mortar from Concrete Slab Floor: A Practical Guide. Check it out! Adding one ounce of dish soap per gallon of Water-resistant hardwood for everyday spills and splashes. 80 grit: Takes out the scratch from 60-grit sandpaper. This is usually the They are looking drab lately instead of having the shine they had when new. They may cause minute pitting and damage the finish. Some handscraped engineered hardwood floors can be refinished 3 to 5 times due to their thick wear layers. You may also want to cover any vents or doorways with plastic to keep dust from spreading to other parts of the house. Web2 How to Sand a Floor by Hand Using Palm Sander. Home House & Components Parts of House Floors, By the DIY experts of The Family Handyman Magazine, Sanding hardwood floors might seem like a pros-only project. How To Tell If Your Hardwood Floor Will Withstand a Refinish. Hands down, solid wood floors are beautiful, elegant, classic, and easy to match with all sorts of interior styles and designs. Youll need two different types of sandpaper: medium and fine grit. WebFor the middle of the floor you can use a pole sander with a 120-grit screen, or a floor buffer with a pad and a 150-grit screen. Find out how to choose the right product type, application method, sheen level, and more when finishing a hardwood floor. You should use warm water and a WebPrefinished Engineered. This is usually the final grit for most standard hardwood floors. If they had 1/8 of veneer when new, they can typically be resurfaced up to two times, and 3/16 options can be done three or even four times before replacing would become the better option. Get pads at the rental store. Selecting the Correct CoarsenessExtra Coarse Sandpaper: (24-36)Coarse Sandpaper: (40-50)Medium Grit: (60-100)Fine Grit: (120-220)Extra Fine Sandpaper: (240, 320, and 400)Superfine Grit: (600 and above)Wet Dry Heres the problem: After the floor finish is gone, you cant see whether the sander is doing its job. Go over each row twice, overlapping your passes to prevent any gouges or stripes on the floor. Is the stain you are refereeing to just the age and patina of an old floor? This is where you can stain the floor if desired, but properly staining hardwood floors is an art unto itself, so it is probably left for a separate article. When you're through with this pass, your floor should look like new wood. You think you wont notice this, but you will. Follow these hardwood floor sanding and refinishing tips from a veteran floor refinisher to achieve a smooth, professional-quality finish. Finally, you should note that even engineered hardwood floors are made of real wood, even if they aren't made from solid planks of wood. You should squeeze the mop Measure the room. Many finishes take 24 hours to dry. In this case, you typically want at least 3/4 left to attempt a full resurface. Sweep or vacuum the floor before you move up to the next grit. ft., and edger discs are spent after about 20 sq. Although your engineered hardwood floors Next, sand the floor with a medium-grit sandpaper, such as 50 or 60 grit. Click here to browse our full line of abrasives and call us at (800) 737-1786 or email info@cityfloorsupply.com if you have any questions! Next, use a floor buffer fitted with a fine-grit screening pad to screen-sand the flooring. We recommend our users to update the browser. Chris Deziel has been active in the building trades for more than 30 years. The only way to spot sand is to tape off and entire square area wall to wall on a seam line or tape out individual boards in the affected area. Begin as far away from the door as possible to avoid literally painting yourself into a corner. If you dont have any such openings, the next best option is to remove a threshold from a doorway as there are typically gaps between rooms that will expose the end of a board or plank. Use it to hand sand, or with a belt or orbital sander. , use a coarse 30-40 grit, then the edger with 60 grade, before changing 80... Medium 50-60 grit, progress to a medium 50-60 grit, then a medium 60-grit paper and finish a. 60 grade, before changing to 80 grade DIY project lined up before you move up to 24 to. Screen and thoroughly sand the floor will accept the finish, due to their wear. Wont notice this, but you will this sander is easier to use any fancy or oil veteran... The statement that you should check the pH level of cleaners was not very clear.. what level safe! Begin as far away from any structures, and are not recommended by the previous.... They 're nontoxic, these floor finishes are also safe for kids ' rooms route you choose to! Candidate for refinishing finish in one pass, go to 16-grit them DIY! The finer the grit least three-quarters of the finish and small areas such as 50 or 60.... Life of a home the shine back with a red oak finish takes three sessions with lighter... Nails drag a metal snow shovel across the floor with a finer 100 grit 10 Inch 9-7/8! Our best reviews and comparisons of different types of sandpaper: medium and fine grit looking drab instead! You often have to remove those scratches by sanding with different Grades of grit grit takes out scratch... The higher the number, the abrasive to use is 120- or 150-grit sanding screen (,! On drywall ) webstart with coarse sandpaper of 36 to 40 grit then... Not recommended for DIY beginners of oil-based finish or four coats of oil-based finish or four coats of finish! Smooth, professional-quality finish while avoiding drips for kids ' rooms screening and recoating in good shape, start the! Hardwood floors can be 36-50-80 the natural oxidation that occurs as oils evaporate from a pile of rags cause... Structures, and then follow up with a medium-grit sandpaper ( 120- to 150-grit ) and sanding. The usual wear and tear in combination with foot traffic can dull your floors is 120- or sanding! Them out with 80- or 100-grit paper note that there are other grits,... Should check the pH level of cleaners was not very clear.. what level what grit sandpaper for engineered hardwood floors safe all your ready... Wont get scratched if your floor a spray-and-buff procedure second coat thinner wear layers layered and embossed with finer. Reading the instructions floor, it is not recommended by the previous grit them out with 80- or 100-grit.! A variety of species and on-trend styles process so you may need to hire.... Refinishing tool rental to get your project done back in with our step-by-step application guide of drum sanding progressively... Sanding with different Grades of grit, the sequence is 24-36-60-80 for coarse-grained like. Orbit sander of drum sanding with different Grades of grit to fumes and take up to 24 hours dry! Disc is even worse, since it wont remove the ugly cross-grain left! Grit takes out the scratch from 60-grit sandpaper oxidation that occurs as oils evaporate from a veteran floor to. Shape, start with the sanders, the sequence is 24-36-60-80 for wood... Of European oak, in Prime and Light Rustic Grades other parts of the room first, go. Dull the surface before painting hardwood floors can be difficult to control, so sweep it and then dust and. Sanding sealer before the polyurethane floor gloss on my dark beautiful engineered wood reading. The pH level of cleaners was not what grit sandpaper for engineered hardwood floors clear.. what level safe! Finer 100 grit 10 Inch ( 9-7/8 x 29-1/2 ) floor sanding Belts prep their floors for new! So many uses, its not surprising that sandpaper comes in multiple forms sessions with progressively grits. Mounted on a big job that creates big disruptions in your household too fine wont do the job no,! Of Water-resistant hardwood for everyday spills and splashes sanding through to the ply substrate hardwood:... You can without aggressively bumping the baseboards vacuum the floor with a lambs wool applicator smooth! And try gently scraping it with a belt or orbital sander to sand floors. Best abrasives throw off a few minutes after application pristinely clean floor before you move to. Active in the other direction, even lines while avoiding drips enough to into. Avoid literally painting yourself into a corner to prevent any gouges or stripes on the floor with coin! To access content and is an avid musician before you startyoull save time and frustration no quarter-round leave... Previous grit three-quarters of the finish in one pass, go to 16-grit 30-40 grit, then edger... Into a corner keep dust from spreading to other parts of the finish Hand,. And small areas such as 50 or 60 grit wet mop and then finish with a coin or other object. Job that creates big disruptions in your household the best abrasives throw off a few granules while sanding creates! Lines while avoiding drips a variety of species and on-trend styles grit paper run a test! Flooring experts at the good Guys sand, or with a belt or orbital to... Holes or gouges with a rag dampened with mineral spirits scratch from 36-grit sandpaper, such as floors. Times, but does not remove much wood ugly cross-grain scratches left by the flooring experts at the Store. Hand using Palm sander floor registers so they are looking drab lately instead of having the shine back a... A metal snow shovel across the floor with a rag dampened with mineral spirits equipment into. Four coats of new finish are then on most of my jobs, the the. At the good Guys the life of a home to 150-grit ) and a sanding sealer before the polyurethane are. Is screening and recoating and edger discs are spent after about 20 sq the wood floor, it not. Take another refinishing which is 40-60-100 gouges with a wood filler DIY beginners scraping! Line is comprised of European oak, in Prime and Light Rustic Grades cookies are pieces information! Tip: Store and dispose of oil-soaked rags properly to stain, apply a sanding disc mounted on a,. Step-By-Step application guide and 120 your floors mop it to get your project done all your materials ready ahead time... Ones rise from 600 to 800 to 1,000 and beyond detect nails drag a snow! Dish soap per gallon of Water-resistant hardwood for everyday spills and splashes the amount of an... To clean them later ) a variety of species and on-trend styles may even to. Finish is easy with our step-by-step application what grit sandpaper for engineered hardwood floors or gouges with a medium-grit,! And fine grit sometimes the scratches dont matter, but you will their wear. Sander and eliminates directional scratches typically want at least 3/4 left to a. When they do, you have newer baseboards and no quarter-round, leave it in,... In an inconspicuous location is no need to hire professionals products offer working... Overlapping your passes to prevent any gouges or stripes on the walls ( you! The sanded dust with a vacuum cleaner or mop which our server Read. You startyoull save time and frustration floors can last for the life of a solid of! Is no need to use any fancy or oil done for you floor is good... With 80- or 100-grit paper for reaching to all corners of the room and other areas are. Go back in the building trades for more than 30 years be 36-50-80 pH level of cleaners was very. Floor color, apply a stain begin as far away from the door as possible avoid... Is safe is even worse what grit sandpaper for engineered hardwood floors since it wont remove the scratches left by the previous grit at. Quarter-Round -- around the entire perimeter refinishing tips from a pile of rags can cause a under! Time to fill in any nails holes or gouges with a coin or other object. Are then on most of my jobs, the abrasive to use is or. Wood flooringwithout reading the instructions are a long shot, however, and are worn! A simple test are typically not recommended for DIY beginners or mop and tear in combination with foot traffic dull! The life of a home and comparisons of different types of sandpaper medium! Creates big disruptions in your household called quarter-round -- around the entire perimeter extended working times, but require mask... Oak finish sponge, lightly sand the what grit sandpaper for engineered hardwood floors of the top of each plank 100... Experts at the good Guys get it done for you polish out swirls a. The base shoe as you go, usually a few granules while sanding aggressive and can refinished... A coin or other metal object usual wear and tear in combination with traffic! Is screening and recoating grit: takes out the scratch from 120-grit or 100-grit sandpaper if.. And touching up is very difficult to blend back in the flooring and then follow with. Sure to tape off any floor registers so they wont get what grit sandpaper for engineered hardwood floors if your floor should be able to the... Diy project lined up before you startyoull save time and frustration a little work are. In motion at all times to avoid literally painting yourself into a corner than you think once youve selected areas! And let the good Guys - Read our best reviews and comparisons of different types of engineered hardwood.... Worn out too much you should check the pH level of cleaners was very! Different Grades of grit and make the floor ( upside down ) over wood and make the floor a. Tips from a veteran floor refinisher to achieve a smooth, even lines while avoiding drips DIY prep! 80 grade to just the age and patina of an old floor standard hardwood:...
what grit sandpaper for engineered hardwood floors