New front-loading washing machines spin at a higher RPM and have more vibration associated with them. If your washing machine is on a concrete floor, the only problem may that your machine "walks" a bit with this vibration -- which can be a troublesome problem, no doubt. But -- if your washing machine is on a wood frame floor (like mine), you may not only have a "walking" problem, but the floor and wall joists can vibrate. Over a period of time, this can cause structural damage.I recently purchased a front-loading washing machine with anti-vibration technology -- but sad to say, on a frame floor, it still vibrates and shudders (with multiple professionals balancing the washing machine feet to make sure it was as balanced as possible). Despite the noticeable vibration, this new anti-vibration technology does help (way better than my old front-loader) -- but the vibration physics of a higher RPM on a wooden floor is hard to completely overcome. This is particularly true with a large washing load or a poorly balanced load (an unbalanced load is hard to tell ahead of time). I did try several different rubber floor pads (applied to the feet of my washer) which did help the vibration, but my washing machine had a tendency to "walk" on these elevated pads. So -- that was not the full answer.At this point, the solutions become a little more challenging. If you can re-inforce your wood-frame floor, this is ideal. I was able to re-inforce my floor joists because I have a basement underneath -- and this did help some, but the vibration remained noticeable. My washing machine sits on a lineoleum floor over "inadequate" plywood. I was not particularly excited about tearing my linoleum out, putting in additional sub-flooring of at least 1/4 inch (which is ideal and I can see that this may be required for some homes and some washing machines) -- so I tried this 3/8 inch mat as a matter of last resort.For those who are trying to tamp out vibration on a wooden frame floor, this mat should be given serious consideration. The mat is heavy (40+ pounds) and does not move after being placed on the floor. Getting the mat underneath a washing machine is serious sweat equity, but this mat works. I am very impressed. I can sit in a chair in an adjacent room and read the newspaper while the washing machine is in spin cycle. My utility room cover doors no longer rattle. Everyone is happy. This mat does the job very nicely -- and I learned alot in the process!I have a stacked LG washer/dryer on tile on my first floor. The vibration during the washer spin cycle transfers to the floor and walls of my entire home — in fact it transfers all the way up to the second floor, making the window in my master bedroom rattle loudly in its frame. Aside from this annoyance, I worry that it can also cause damage to the studs and floor joists of my home. So, I've been researching and working on a solution for about the past year.First, I bought the Vibrafix rubber feet sold on Amazon. If you're on this page, you've probably already seen it — it has a lot of positive reviews. The Vibrafix feet reduced the vibration upstairs slightly, but the window still rattled audibly.Second, I re-leveled the washer. The machine was technically already level, but I figured the vibration might be reduced if I improved the leveling further. I didn't notice much of a change after leveling.Third, I bought this Rubber-Cal Anti-Vibration Washing Machine Mat. I really wanted it to work — it had a handful of 100% positive reviews, including one which described a stacked washer/dryer on tile just like mine. At first I was hesitant since it was so expensive ($93 for a rubber mat??), but I figured that it was a small price to pay to protect my home and that perhaps it was made of a better, more durable material than other rubber mats.The pros of this mat are that it is made of heavy duty rubber that won't shed. It is very dense and heavy, and it will probably last a very long time. The mat was not as elastic as I expected (I can barely cause any depression when I pinch it between thumb and index finger), but its weight made me hopeful — I thought that the high mass alone might absorb and dissipate most of the vibration. There is a strong "new tire" odor, but I followed the advice of other reviewrs and was able to eliminate it by letting the mat sit outside for about 6 hours.I cut the mat to size using a measuring tape, metal straight edge, chalk and a box cutter/utility knife. Like another reviewer noted, scissors will not do the job. You need to slice the mat along the same line (against a straight edge) over and over again, in layers, until the knife finally breaks through to the other side. If you use this technique, your cut will be perfectly clean and straight.Getting the mat under the stacked washer/dryer was a bit of a pain. You can't just fold the mat, tilt the machine to one side, slide the folded mat under the raised legs, and then tilt the other way to unfold. The mat is so thick that it doesn't fold flat enough to fit under a tilted machine. You really need a dolly or some serious human lifting power, depending on the space your washer/dryer is in.I just did my first wash load on the new mat and was utterly disappointed. Somehow, the mat has made the spin cycle vibration worse. I'm not sure how this is physically possible, but the ears and eyes don't lie — after all of the expense, cutting and lifting, my upstairs master bedroom window actually vibrates worse now. And the railing on my stairs has now started vibrating with the spin cycle.I plan on troubleshooting and experimenting further, but it's hard to articulate here just how disappointed I am. I took a risk on a product that had few reviews and I paid the price. I've lost about $90 on a sub-par product that I can't return because I've already cut it up. In fact, unlike other anti-vibration mats on Amazon that are pre-cut to the footprint of a typical American washer/dryer, the strange, large size of this mat makes me wonder if the seller designed it this way in order to prevent returns.Cutting the mat into appropriate sizes for each machine was a challenge, but a fresh razor blade in a utility knife worked pretty well. I went with 2 layers each under a front loading washer and dryer that is upstairs in our house, and the mats nearly completely silenced the vibrations. Now the only noise is what comes directly from the machines, not what vibrates through the floors. Highly recommend.I installed this in my laundry closet under the washer and dryer. It’s glued down to the plywood sub-floor and the baseboard moldings are installed on top of it around the perimeter like any other flooring would be. It’s one of the best home improvements I’ve done; the appliances no longer “walk” around the floor from all the vibrations. I’d imagine that it quiets the operation of the machines a bit too, though I can’t really measure that. Perfect for this application, I’m very satisfied!For years, my washing machine has been walking the floor during its spin cycle. It's level. The clothes are evenly distributed. We put it up on thick rubber mounts. We even swapped out a top loader for a front loader. Nothing worked. As part of a remodeling project, I had a 1 inch sheet of plywood installed on top of the existing sub-floor under the washer and dryer and then covered the plywood with this rubber mat (the mat is really heavy and dense). We ran 3 loads last night... No noise, no hint of movement. For now, the problem appears to be solved. I hope it stays that way. The rubber mat arrived on schedule and was exactly what I expected it to be.