"bounce factor" you are kidding me right? what do you do for a living? i am an expert its what i do for 50 hrs a week im qulaified to build a house from start to scratch, i KNOW what im talking about. im intrested to know your credentials.
you clearly feel that you fit in this "forum guesser" criteria as you seem incredibly offended. id call that guilty. oh and that floor wont be 2x4's it'll be 5x2's but you probably already new that or at the very least you could have guessed it right?
as for the whole leaving the weight on the floor ofr a long period then i suggest you dont put a heavy bed and wardrobes in your bed room for too long apparently according to the guessers the floor will sag or something????
to the original poster i would seriously disregard any info youve had from the guessers and if you are that worried take out a survey. these guys just want to up posts counts or something. its bordering on odd.