How do you cut sheeps-wool loft insulation?
100mm Thermafleece loft insulation to be precise. Large scissors are stopped dead. A Stanley Knife just scrapes small lumps from the surface. Even a single-edge razor blade from a windscreen scraper just glides over it. It can be torn, but very untidily.Finally, I put down two boards with a couple of millimetres gap between them, laid the insulation across them, placed two matching boards across the top, stood on the upper boards to compress the insulation, trying not to wobble and needing several attempts to get the alignment right, then cut between the gap with a large sharp straight-edge carving knife. That worked.
So now I'm intending to build a cutting jig so that I can do the above without falling through the roof. But am I missing something? Should it really be that difficult?
(I had previously asked this group about putting extra insulation under a section of flat-roof but was dissuaded by warnings about moisture so I'll think about that another day. However, sheeps-wool insulation was mentioned, and that seemed an excellent choice for replacing the dirty old itchy 1" mineral-wool insulation in the main part of my loft.)