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How to make vibration isolation of the washer and dryer?

I plan to put a washer and dryer in the kitchen, one on top of the other. The floor in the room – dry screed. Underlayment – about 10 cm of sand and expanded clay, in place of the column – sheets Knauf thickness of 4 cm. The problem is that the back legs of the column will stand on a screed, through which the riser. This screed appears to be poured directly on the floor slab. There is a concern that the vibration from the machines will pass to the downstairs neighbors without loss. What can you vibro-insulate the column? The load is point, 4 legs of 25 kg.

• vibration isolation