Anybody got any good ideas how to use up offcuts from fitting rigid insulation. I insulated under my floor and I now have a large quantity of pieces about 1.2m long 20cm to 30 cm wide, Kingspan 75 mm thick.

I can use some to make a insulated lid for my compost heaps but unless I can think of something creative the rest seem destined for landfill.

I had wondered about shredding and loose-filling with it. The idea came via a colleague who used to live on an island. The (wood) shredder was used for pretty well everything - glass, cans, all sorts. I don't know whether it would work, but don't know why it wouldn't. Thoughts, anyone?

I've just fitted 200 sq mtrs and have no bits left. I do have three full sheets.
I fit all the bits together tightly. It's easy to cut it with an old carbon steel table knife.
Did you have to lay it in big pieces?

... forgot to sign in that last comment was from the original poster, me

I used offcuts in my loft on the dwarf walls between the heated and unheated spaces. Build the stud partition as normal, [structural if necessary] fix a layer of ply or plasterboard, stick your offcuts on, then vapour barrier, then battens, then plasterboard over again. Better than insulating between the studs as cold bridging is eliminated.

I'd offer them to a Freecycle group in your area if you no longer need them.

I do the same as Jeff Norton. I've insulated the last three houses I've build with PU in the walls and floor, the off cuts are then used around the eaves but still leaving the continuous ventilation uncovered. Any remaining offcuts I use above bathrooms by fitting them together like a jigsaw with no picture for guidance! The loft still receives it's rockwool insulation as well but only 200mm on top of the PU instead of the 350mm elsewhere.