leveling freestanding bath on very uneven floor

[DebM]

We are having a roll top free standing bath fitted, but we have a problem with a very uneven floor. The floor slopes down the length and width of the room resulting in the cast iron feet of the bath needing to be packed up with stubs. The adjustable flexibility of the cast iron feet has been maxed and they is still approx 1.2cm out on three of the feet (only one foot is sitting on floor as they should be). They are currently packed up with plumber studs (plastic in multi colours and wooden blocks). This solution is far from desirable! Has anyone encountered this problem before and can you suggest more creative, sustainable and less obvious solutions? Our plumber is struggling to find a solution. HELP!

 

[ocemeer]

Had the same problem with our bath
Made up 4 pad pieces,150*150mm from 25mm MDF covered them on top and the edges with the floor covering, in this case cork, and then sealed them all over with varnish. Where the floor was uneven I applied cork to the bottoms to bring the bath level.
This had the additional benefits of spreading the load for a very heavy cast iron bath and assist in the drainage.
I don't know if this is a standard thing to do but it worked for me.