Product review (5 stars): Yes, they stop house shake
I bought these, no secret giveaways or pay for write-ups.

They are fantastic. We have a pier & beam house and we have stacked full size front loading laundry. That combination used to mean literally full house-shaking when doing laundry spin cycles. These pads eliminate a good 90% of the house shake. I've now had them for a year. They don't show any signs of rot, yet.

Mine sit in a plastic backup emergency drip pan but I don't think that is a factor other than to hide them a bit. They're not exactly haute fashion.