Foam sandwich for seat/bed

[pcatterall]

just competing my third DIY camper conversion but my question has a boating connection.
previously for the a long settee/bed mattress I used a foam sandwich, half firm and half soft ( this is my wife's berth and she is rather like the princess and the pea!!) in the day the mattress is firm side up and at night flipped over.
My reasoning was that firm side up the load was spread so that the soft lower bit didn't squash too much and that soft side up the squidgy bit had a lower layer which kept sharp bits like hips off the hard base.
has anyone else done this and is it really better than just getting a 'medium' foam anyway?

 

[nigelmercier]

It is normal to put a 25mm layer or medium or soft foam on top of a thicker layer of hard foam.

I don't understand the reason for flipping during the day, you are preventing the moisture in the top from evaporating.

Not that I'm suggesting your wife is sweaty

 

[rivonia]

Interesting. We had a foam mattress made for our double bed/berth. Bottom 3rd HARD middle 3rd MEDIUM and the top third SOFT. It served us well for 6 years. We had a slatted base underneath.

Peter

 

[pcatterall]

"My reasoning was that firm side up the load was spread so that the soft lower bit didn't squash too much" quote

with firm side up it seems to make a more normal type seat. In cold conditions most of the moisture seems to be ( or at least condense) at the bottom so flipping seemed to work. On the boat we stand mattress on edge.
FYI Men sweat, officers perspire and ladies glow!!