Any advantage to install on raised deck vs. patio?

[luvin_tubin_sqezin]

I am curious if there is any school of thought on advantages to building a raised platform/deck vs. pouring a pad or creating a pad from 6x6's and stone etc.   By raised I'm talking only like a foot to 18".

It is a colder climate in general.  Plenty of snow.  Not sure if theres an efficiency benefit to one or the other (wind flowing underneath etc.).  

Dave

[Bonibelle]

My tub is on a deck about 3 feet off the ground and I have thought about putting some kind of insulation under the decking because I believe that there is definite heat loss through the bottom of the tub. That area is probably the least insulated in the entire tub.
Decks freeze like bridges do, before other surfaces, so my thought is a tub on the ground would be more efficient.

[luvin_tubin_sqezin]

My tub is on a deck about 3 feet off the ground and I have thought about putting some kind of insulation under the decking because I believe that there is definite heat loss through the bottom of the tub. That area is probably the least insulated in the entire tub.
Decks freeze like bridges do, before other surfaces, so my thought is a tub on the ground would be more efficient.

Excellent point!  The tub is currently on a reinforced deck as well but am looking to relocate and take the tub if possible (or replace).  I think a pad might be the way to go too.  

Thanks...

Dave