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1. 
   greg_watson | Jul 20, 2016 05:13pm | #1

   I use my machete - it's a 22" blade, and I drag it across. Works like a charm, and I sharpen it with a file every now and then. The edge then acts like a Ginsu knife -

2. 
   tootalltoobald | Jul 21, 2016 08:39am | #2

   I lay a small piece of 1/2" plywood across the insulation, to compress it, and then cut with a utility knife.
   The knife trip is great for Roxwool though, I used a serated bread knife and it worked like a charm!

3. 
   Dunwright | Oct 05, 2018 05:25pm | #3

   When I installed fiberglass insulation I ripped a narrow slot in a 1 x 6 and securely attached some 3' of wire to the backside. The other end of that wire was secured to a 4: piece of broomstick. In use the wire is fed through the slot, onto the floor. The batt is passes through over the wire on the backside if the 1X. Just stand on the 1X and pull the wire through the slot. It works a lot like an egg slicer. P.S. it also worked with upholstery foam.

4. 
   ktkcad | Oct 05, 2018 10:25pm | #4

   Bread knife.

5. 
   [email protected] | Oct 06, 2018 06:12am | #5

   I use my old Japanese pull saw blades (dozuki).

6. 
   huskiedad | Oct 06, 2018 08:44am | #6

   hedge shears. snip snip you're done.