Updated April 17, 2019 by Gabrielle Taylor

The 10 Best Insulation Knives

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We spent 24 hours on research, videography, and editing, to review the top selections for this wiki. 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 picks, we may earn commissions to support our work. Skip to the best insulation knife on Amazon.

10. Everhard Long Cut

9. Slice Industrial

8. Hultafors FGK

7. Insulation Knife by Vintool

6. Fuller Tool Double Sided

5. Morakniv Craftsmen

4. Malco Serrated

3. Klenk Dual Duct

2. Bullet Tools CenterFire

1. Klein Tools Stainless Steel

Editor's Notes

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.


Gabrielle Taylor
Last updated on April 17, 2019 by Gabrielle Taylor

Originally from a tiny town in Virginia, Gabrielle moved to Los Angeles for a marketing internship at a well-known Hollywood public relations firm and was shocked to find that she loves the West Coast. She spent two years as a writer and editor for a large DIY/tutorial startup, where she wrote extensively about technology, security, lifestyle, and home improvement. A self-professed skincare nerd, she’s well-versed in numerous ingredients and methods, including both Western and Asian products. She is an avid home cook who has whiled away thousands of hours cooking and obsessively researching all things related to food and food science. Her time in the kitchen has also had the curious side effect of making her an expert at fending off attempted food thievery by her lazy boxer dog.


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