Loft flooring/ conversion?

Wanna eventualy convert loft into living space,for now doing the floor. if for storage i know all i need to do is fit some boards to beams.but if living space need stronger floor , any websites for diy loft conversions as i am nice at diy think i need to put in new beams but not sure . ps simple ans would be nice and not ie; see a pro or drawn out answers websites for loft conversions????
Answer
To reinforce your loft floor use 2x2 timbers.first lay the timbers at about 2ft intervals the opposite way across the joist screw them down look out for wires &pipes. then lay your timbers with the run of the original joists screw these down. then use either 8ftx2ft or 4ftx2ft t&g chip board.this should raise the floor to about 7" nice luck