How can I floor my loft without compressing the insulation?
The UK DIY store B&amp;Q used to sell 'Loft Storage Stilts' for this purpose. 


Image courtesy of http://loftstoragestilts.com/ used without permission, but hopefully attribution is enough

Alas they no longer seem to be selling these, so you may now need to contact the the original manufacturer or seek out alternatives.

A google shopping search found another similar product.