The 10 Best Insulation Knives
This wiki has been updated 16 times since it was first published in March of 2017. Though it may seem like most cutting tools do pretty much the same thing, some jobs are considerably easier when using specialized equipment made for the task at hand, and installing insulation is no exception. Our list of knives includes a variety of sizes and styles with blades designed to help you slice through foam, fiberglass batting, mineral wool, and duct board with ease. When users buy our independently chosen editorial recommendations, we may earn commissions to help fund the Wiki. Skip to the best insulation knife on Amazon.
April 16, 2019:
We included knives in a variety of sizes and styles to suit different tasks. Double-sided blades offer the versatility to work with multiple types of insulation. The Klenk Dual Duct, Malco Serrated, and Klein Tools Stainless Steel all have a serrated side and a smooth side, and the latter also has a metal cap on the end of its handle that can double as a hammer. If you need a longer blade, the 18-inch Hultafors FGK and 14-inch Morakniv Craftsmen are both good options, and the Fuller Tool Double Sided is 11 inches long with two different serrated edges. Designed for ISO board insulation, the Everhard Long Cut is sharpened on all sides, and the chisel tip is useful for opening plastic packaging, but it does not have a nonslip grip and can be rather dangerous when using a lot of pressure. The Slice Industrial has a replaceable ceramic blade that's great for foam, fiberglass batts, and other soft materials, but it is more brittle than metal and may break if dropped or used on tougher materials.