Time to tackle the loft

When we bought the house the loft had fibreglass blanket laid between the joists to an average depth of 170mm. Newspapers stuffed into odd corners appear to date this deed to the late 1970’s. When we came we floored about a third of the loft so we could use it for storage. This of course is now covered in a ton of stuff not easily moved. I reckoned that there were about 32 square metres which I could cover with either 100 or 150mm wide insulation, laid over or between the joists, to achieve a minimum of 270mm overall.