I would get a roll of 100mm insulation (used for topping up),
and cut it into several 30cm wide rolls. (This is quite easy
with a long kitchen knife -- do it with the roll wrapping
still on.) Some rolls come sort of pre-perforated for cutting
to certain joist separations. If there's a 30cm pre-perforated
one, go for that. Otherwise try to get one which isn't pre-
Having laid this between the joists, then lay another 100mm layer
(or more if you want) uncut full width across the top at right
The space blanket stuff has been discredited.
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