safety with polished marble floors?

Question

I'm interested in slip-and-fall problems with
polished marble floors.

Safety experts say that polished marble has a
static coefficient of friction ("SCOF" -- the key
measure of slipperiness, a higher level being
better) of between .4 and .5.

But Americans with Disabilities Act ("ADA")
recommendations call for level walkways
with a SCOF of .6 or better.

So how do builders and developers
who use polished marble in public lobbies
manage to ignore or to comply with the ADA
requirements?

If they can't get the SCOF of standard polished
marble above .5, wouldn't they risk legal suits?

Or can builders and developers use some
sort of additive or chemical agent that
preserves the beauty of the polished marble,
but raises the SCOF to a more acceptable
level of .6 or better?

Are there any books or articles on this topic?

Are there any recognized experts?

Or is mastery of these issues solely a matter
of extensive personal experience?

Many thanks for ANY useful advice!

Answer 1

"So how do builders and developers
who use polished marble in public lobbies
manage to ignore or to comply with the ADA
requirements?"
They don't. I think you will find that buildings built recently avoid the use of highly polished marble where people walk going for a better surface. Maintaining a high polish on marble is an expensive proposition and I think you will find few buildings that used it for floors, limiting it to counters, walls, benches and other details.