A front-loader spins a heavy, wet load at high speed, so its installation guide sets floor requirements: how level the floor must be, how much weight it must hold and how stiff it should stay. A floor that flexes or tilts turns that spin into noise and shaking, which is why the guides treat the floor as part of the installation.
San Diego laundry rooms sit on very different floors. A garage slab in a Mira Mesa tract home, a second-story laundry room in Carmel Valley, a raised wood floor in a North Park bungalow and a stacked closet in a Downtown condo each fail the floor test in their own way.
What the manufacturer specs say
- •Whirlpool commercial front-load washer (CHW9050/CHW9060): The location requirements call for a level floor with no more than 1 inch of slope under the whole washer, and a sturdy, solid floor to support a total weight, water and load included, of 400 pounds. The guide says installing on soft floor surfaces, such as carpet or foam-backed flooring, is not recommended.
- •Maytag (front-load washers): Maytag's leveling page says these high-spin speed washers require sturdy floors, and that flooring that flexes or is uneven can contribute to noise and vibration. It adds that vibration you can feel from across the room can be a sign of a flexing floor, and that securing a piece of 3/4-inch plywood to the floor under the washer and dryer may reduce it.
- •LG washers: LG says your washer must be level and installed on level, solid flooring with properly adjusted feet, with all four feet firmly on the floor and the lock nuts tight.
Weight figures differ by model. For comparison, Whirlpool's residential top-load guide lists 315 pounds loaded.
Why the floor matters so much
- •Spin forces: Even a well-balanced load isn't perfectly even. At high spin speeds, small imbalances become strong pushes against the floor, many times a second.
- •Floor flex amplifies motion: A springy floor moves with the washer, and the two can reinforce each other, which is why the shaking can feel worse than the load explains.
- •Slope and balance: A washer on a tilted floor sits with uneven weight on its feet, so the drum's motion isn't centered.
- •Soft surfaces: Carpet and foam let the feet sink and shift, so the washer never stays level.
San Diego floors and what to watch for
Garage slabs
Concrete is about as stiff as a floor gets, which is good. But garage slabs are usually poured with a deliberate slope toward the garage door so water drains out. Depending on where the laundry sits, that slope can eat a good part of the leveling feet's range. Measure it across the washer's footprint. If it's beyond what the feet can correct, a level platform built for the purpose is the usual answer, rather than shims. Garage laundry also has temperature limits to keep in mind; see washer and dryer garage temperature limits.
Upstairs laundry rooms
Many 1990s and 2000s homes in Carmel Valley, Scripps Ranch and eastern Chula Vista put the laundry on the second floor near the bedrooms. That's convenient, but it's a wood-framed floor that can flex, and vibration travels into the rooms below. These installations deserve extra care with leveling and an overflow pan with a drain, since a leak upstairs reaches the ceiling below quickly.
Raised wood floors in older homes
Craftsman bungalows and older houses in North Park, South Park and Kensington often sit over a crawlspace on wood joists. A laundry area added to a back porch or service room may be on a floor never designed for a modern front-loader.
Condos
Stacked units in condo closets sit on whatever the building provided, often a wood-framed or lightweight floor assembly in mid-rise buildings. Vibration and noise can carry to neighbors, and some HOAs have rules about laundry equipment and overflow pans. Check yours before replacing a machine.
How to check your floor
- Place a level across the floor where the washer will sit, side to side and front to back. Measure any gap under the level's low end to judge the slope across the washer's footprint.
- Note what's under the floor: a slab, a crawlspace or a room below. Wood framing flexes more, especially near the middle of a joist span.
- Stand where the washer goes and bounce gently on your heels. If you feel the floor give or hear things rattle, it's flexible.
- After installing, push down on each corner of the washer diagonally, the corner-to-corner test LG and Maytag describe. Any rocking means a foot is off the floor.
- Check that the lock nuts on all four feet are tightened against the cabinet.
- During a spin, feel the floor a few feet away. Maytag treats vibration felt across the room as a sign of floor flex.
What happens when it's ignored
- •Loud thumping or a buzzing floor during high-speed spins.
- •The washer walks out of place and can strain hoses or the power cord.
- •The washer stops or slows the spin repeatedly as it detects imbalance, and loads come out wetter.
- •Wear on dampers, springs and bearings speeds up.
Stacking adds weight and height to the same floor. See washer and dryer stacking kit requirements. If your machine drains poorly as well as shaking, see washer standpipe height.
What we check on a service visit
Shaking on a solid, level floor points to the machine. When we're called for vibration or noise, we check:
- •That the shipping bolts were removed. On a new install, this is the first thing to rule out.
- •Leveling feet, lock nuts and the corner-to-corner test.
- •Shock absorbers or dampers, and suspension springs.
- •Drum bearings, which show up as a rumble that gets louder with spin speed.
- •The spider arm on the back of the drum, which can crack on older front-loaders.
Our washer repair page has more on suspension and bearing repairs.
When another trade is needed
- •If a floor flexes noticeably, a contractor or structural engineer can assess the joists and whether blocking or added framing is needed. Don't cut or notch joists yourself.
- •Moving laundry to a stiffer location, such as the garage slab, usually means new water lines, a drain and possibly a new circuit. That's work for a licensed plumber and a licensed electrician.
- •A gas dryer that moves with the washer needs its gas connection handled by a licensed plumber or gas contractor.
Frequently asked questions
Will anti-vibration pads fix a shaking washer?
They can soften noise on a solid floor, but they won't fix a flexing floor, a washer that isn't level or worn suspension parts. Check those first.
Is the 3/4-inch plywood trick worth trying?
Maytag suggests it as a way that may reduce vibration on a flexing floor. It spreads the load across more of the floor framing. It's not a substitute for fixing a floor that's structurally weak.
Sources
- •Whirlpool: CHW9050/CHW9060 installation instructions (1-inch maximum slope; 400-pound sturdy floor; no soft surfaces)
- •Maytag: Leveling a Front Load Washer (sturdy floors; flex and vibration; 3/4-inch plywood)
- •LG: Washer troubleshooting vibration issues (level, solid flooring; feet and lock nuts)
Quick check: Bounce on your heels where the washer will stand. A floor you can feel move is one the washer will move too.
If the shaking continues on a solid, level floor, you can book a visit online and we'll check the suspension, bearings and leveling in person.