The vibration from her AEG integrated washing machine vibration is annoying the basement flat.
Looking at the supporting walls below, it looks like her kitchen occupies about 4 metres worth of a 6 metre span. The washing machine is about 3.5m from the party wall and supported by two or three of the flooring joists (about 4m along their 6m span).
Thus far she has tried using a 10mm anti-vibration pad with a 10mm porcelain tile on top of it. Then she tried the pad on top of the tile. She has had an engineer from AEG confirm that there is no problem with the machine. I assume that he checked to make sure that it is level, as it is fully integrated it is difficult to tell.
Other than recommending a thicker pad, the only suggestion that I am able to offer is that she swaps the positions of the dishwasher and the washing machine. The washing machine would still be the same distance along the joist span but it would now only be 600mm form the party wall. Given that the joists run parallel to the wall, would this make the slightest bit of difference?
Is a thicker pad likely to make any difference?
Would a sheet of iron bolted to the floor under the kitchen units make much difference ( I dread to think how much that would weigh...
You can definitely feel the floor bounce when it is spinning, the machine doesn't look like it is vibrating much but downstairs it sounds like a muffled helicopter (kinda like the swooping noises made by the rotor blades). The muffled noise may be the result of the basement flat having a suspended ceiling.
The floor finish is oak (non-floating), I do not know what the sub floor is (I guess that it is either the original floor boards or chipboard).