The 10 Best Insulation Knives

Made from high-carbon spring steel, the Everhard Long Cut is sharpened on all sides, so you can stab and slash from any direction, and the chisel tip comes in handy for tearing open packaging. However, note that it does not come with a sheath for storage.

Designed for safety, the Slice Industrial features a finger-friendly ceramic blade that conveniently retracts when you're not using it. It can be adjusted to four different cutting depths, making it suitable for a wide variety of materials.

Built for comfort, the Hultafors FGK is equipped with an ergonomic handle made from impact-resistant plastic, and a fully-serrated, 18-inch blade for effortless precise and straight cutting through many types and layers of insulation wool.

Whether it's carpet, ceiling tile, fiberglass, or foam board that needs attention, the Insulation Knife by Vintool can accommodate it. The combination of its stainless steel and aluminum construction ensures both its longevity and performance over time.

As its name suggests, the Fuller Tool Double Sided sports an 11-inch blade with two distinct edges — one with fine serrations and the other with larger scalloped teeth — allowing it to cut through materials of varying thickness and density.

The Morakniv Craftsmen is a professional-grade construction tool with a sturdy plastic handle that's large enough to accommodate almost any hand size, even when wearing heavy gloves. A limited lifetime warranty is included.

Constructed from heavy-duty cutlery grade steel, the Malco Serrated has a six-inch blade that holds its edge well. It can even saw through tough materials, like rope and small branches, making it great to take along on hiking and camping trips.

Good for almost any professional who may be carrying a lot of gear to and from job sites, the Klenk Dual Duct boasts a truly lightweight design, at only 4 ounces. A rosewood handle with solid brass rivets helps to make it both handsome and durable.

Designed to cut efficiently through foam and fiberglass batt insulation, the Bullet Tools CenterFire has a 7-inch blade, which is twice the length of most similar models. Its lack of serrations prevents the buildup of dust and debris while working.

The Klein Tools Stainless Steel cuts easily through duct board and flexible duct insulation, thanks to its double-sided design, with both regular and serrated edges. It comes with a puncture-resistant nylon cover that will keep it protected when not in use.