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i've recently done a similar mini-utility, but hadn't really thought through the vibrations from the washing machine as it was previously on a concrete slab and is now on a suspended timber floor.
as you say it's not too bad, but certainly more noticeable than it was in its previous location.
wish i'd thought about it more before putting the flooring down though as i might have poured some concrete. oh well!
how are the vibrations when the washing machine is on with it being upstairs?