I assume you mean right against the drywall? No cutting out to expose the joists?

"Craven Morehead" wrote in message ...
John,

Use the jack to support a 2" x 12" x 4', placed directly against the garage
ceiling, beneath the washer. Crank in enough force to stop the vibration but
stop short of distorting the floor structure. This WILL stop the house from
feeling the vibration.