Product Description
Milwaukee Serrated Blade Insulation Knife
Model Number: 48-22-1922
The Milwaukee 48-22-1922 is the Serrated Blade Insulation Knife — a specialty fixed-blade knife designed specifically for cutting fiberglass batt insulation, rigid foam board insulation, and other insulation materials encountered in residential and commercial building envelope installation work. The serrated blade is the key design choice for insulation cutting — fiberglass batt insulation's fibrous structure tears rather than cuts cleanly with a smooth knife blade, requiring a sawing motion and causing the fibers to compress and spring back rather than shearing cleanly. The serrated blade's teeth engage and cut through individual glass fibers with each tooth's forward edge as the blade is drawn through the batt in a sawing stroke, producing a cleaner, more consistent cut edge than smooth blades achieve in fiberglass insulation without requiring the excessive force that would compress and distort the batt.
Insulation installers, weatherization contractors, and building envelope crews cut insulation batts to width, length, and specialty shapes throughout an installation project — precise, clean cuts are important for tight-fitting insulation that fills framing cavities completely without gaps that would compromise the installation's thermal performance. The correct knife for insulation cutting reduces the effort and time required per cut while improving the consistency of cut edges that determine how well the insulation fits the framing cavities and penetration cutouts. Milwaukee builds the insulation knife with a fixed blade for the rigidity and blade stability that the sawing cutting motion of insulation work requires — a folding blade would flex and deflect under the lateral loading of drawing the serrated edge through thick fiberglass batt insulation sections. The handle geometry provides a comfortable, controlled grip for sustained cutting through full batt thicknesses at the volume of cuts typical in insulation installation work.
The smooth blade version of this knife (48-22-1920) is also available for insulation materials where a smooth blade cutting action is preferred — see Milwaukee's complete insulation knife and general knife lineup for all available options.
Features
- Serrated blade for clean, tear-free cuts through fiberglass batt insulation
- Serrations engage glass fibers cleanly — smoother blades compress and tear fiberglass
- Fixed blade for rigidity under the lateral loading of insulation sawing motion
- Produces consistent cut edges for tight-fitting insulation without voids or gaps
- Smooth blade version (48-22-1920) also available for different insulation materials
Specifications
- Blade Type: Serrated, Fixed
- Application: Fiberglass Batt Insulation, Rigid Foam Board, Building Envelope Insulation
Includes
- (1) Milwaukee 48-22-1922 Serrated Blade Insulation Knife
