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Want to eventualy convert loft into living space,for now just 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 good at diy think i need to put in new beams but not sure .ps simple ans would be good and not ie; see a pro or drawn out answers

It all depends on what size your beams are now - they need to be at least 6" x 2". also are you going to keep/ have loft insulation under the flooring. if you are you need at least 2" clearance above the insulation to allow a good air flow.if you do need to add beams then fit a minimum of 4" x 2" across to old beams.