John Rumm wrote:
Pet wrote:
Wickes stuff comes in the usual partial cut 3 width + an extra one
right down the middle which fit's out widely spaced roof thingies spot
on.

IME of the isowool variety, it is only partially cut through. So if you
cut it elsewhere and don't pull it apart at the pre-cut sections you get
to have any size you want.

It falls to bits if the cuts are anywhere near the
perforations, but can be OK. A panel saw is the best
way to cut the roll, IMO.