Insulation Knife - 4" Blade
Built for fast, clean cuts in common insulation materials, this insulation knife gives contractors the control they need for straight lines, square edges, and clean cutouts. It’s a lightweight, dependable job site tool for trimming batts, scoring foam board, and cutting duct wrap without making a mess.
This knife pairs a sharp, rigid high-carbon spring steel blade with an ergonomic molded handle for comfortable everyday use. Whether you’re fitting fiberglass batts between studs or trimming around penetrations, it helps deliver cleaner installs with less tearing, crumbling, and fiber pull-out.
Why Contractors Choose It
🔪 4" high-carbon spring steel blade precision ground for clean slicing and controlled scoring
🧱 Cuts fiberglass and mineral wool batts while also scoring and trimming rigid foam boards like EPS, XPS, and polyiso
📏 Thin blade profile helps make straight, low-effort passes and precise trim cuts
🕳️ Tapered tip makes it easier to start plunge cuts and clean up corners, outlet openings, and window cutouts
🖐️ Molded plastic handle is lightweight, solvent-resistant, and shaped for a secure grip with gloves or bare hands
🏗️ Hardened and tempered blade balances rigidity for control with flexibility to help resist snapping
🧰 Durable jobsite construction holds up to daily use and can be touched up with a stone or file
🧹 Low-mess cutting helps reduce foam crumbling and insulation fiber pull-out for neater installs
How To Use
1. Mark your cut line on the insulation, foam board, or duct wrap.
2. Use the thin blade to make a controlled pass for straight cuts or scoring.
3. Start plunge cuts with the tapered tip when working around outlets, windows, or penetrations.
4. Touch up the blade edge with a stone or file as needed to keep cuts clean on the job.
Specifications
Blade: 4" high-carbon spring steel, precision ground
Edge: Double-beveled on all three edges for smooth, versatile slicing
Blade Treatment: Hardened and tempered for a balance of rigidity and flexibility
Handle: Plastic anti-roll handle with ergonomic grip and control
Overall Length: 8"
Weight: Approximately 0.15 lb (68 g)
Helpful Notes
Ideal for insulation crews, HVAC installers, remodelers, and general contractors who need a dedicated knife for common batt and foam cutting tasks. The 8" overall size gives a good balance of reach and maneuverability in tight work areas.
⚠️ California Proposition 65 Warning
This product can expose you to chemicals including substances commonly associated with metal and industrial manufactured goods, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
