Roll and Cut Method: Tools Required: Sharp Scalloped Edge Knife or Insulation Saw
FOR AN ACCURATE LENGTH: If you have a slab or a roll and want an accurate length, take the insulation and roll it as tightly as possible along the width. Measure where you need to cut to give you the length you require. Taking the insulation saw / knife easily cut through. This provides a nice, neat edge and is an alternative to tearing by hand.
TO CUT THE WIDTH OF THE ROLL: Keep the insulation rolled and do not unwind. Measure the required width that you need then using the knife or insulation saw begin to cut through the whole roll.
Alternatively, cut Thermafleece and SupaSoft insulations using a straight edge and a Stanley knife, an insulation cutting knife or simply torn apart.
For more accurate cutting, tightly compress or clamp the insulation between two pieces of solid 15mm board. Overhang where you want to cut keeping the two board edges aligned. Saw cut the edge using an insulation cutting knife or another sharp, scalloped edged knife. Keep the blade firm and square against both board edges throughout. Trim any fine remaining fibres with large scissors or shears.