This idea was originally prompted out of necessity. The "site worker's laundry facility" is currently located in a garden shed next to the static caravan and because the shed was a hand-me-down that was demolished in Swmbo's father's garden I had to reinforce the shed floor to stop the w/m shaking the whole structure during the spin cycle. The w/m now stands on a 4" raised plinth with 3" x 2" bearers.   After 8 months I have concluded this raised plinth is a good idea because it eases