Hi there, I would fit chipboard flooring, u can buy boards that are sized so they are easy to use but I did my loft with normal boards, a bit heavier but cheaper. I also built up the joist level to accomodate extra insulation before putting down boards and finally, screw every thing where possible or you might knock out the nail filler on the underside of ur ceiling (which I've done in the past) try to avoide covering electric cables where possible.
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