Not the smooth-line bench knife: on fabric, plain cooperative foam, and flexible sheet, a straight edge leaves the cleaner cut line and the 60115 is the better tool — the wave earns nothing where nothing binds.
Not the score-and-snap tool: straight cuts in thin rigid board go faster and cheaper on the utility line's snap-blade class, and an insulating crew sensibly carries both.
Not the answer to dense solid stock that grips a blade's flat faces — that is cheek friction, not edge binding, and the industrial line's hollow-ground square points are built for it; the two relief strategies solve different problems and do not substitute.
Not a detail knife: short steered notches belong to the 4" 60102.
The edge is engineered to relieve binding on its own; the stroke's only jobs are commitment and travel. Full-length draws, moderate speed, light down-pressure — if the blade stalls mid-stroke, the answer is another pass in the same groove, never a shove. Compress, then cut. In lofty material the board-and-knee setup is half the tool; the knife finishes what compression starts. No plunge, no pry. The square end starts nothing in the field of a panel and levers nothing — entries come from edges and drilled openings, and side-loads are how any 1"-wide blade of this thickness dies, this one included (how the blade anchors in this SKU's soft-grip handle is not in the claims , and the no-pry rule stands on the blade's dimensions alone). Mind the abrasion tax. Glass dulls steel faster than any material this store sells for cutting; an insulation crew hones more often than any other knife-owner in the catalog, and the claimed high-carbon steel is the sharpen-and-return kind — chosen for exactly that life. Dressing a wave edge is its own skill: follow the scallops with a round rod or a slack strop, working the curves individually; a flat bench stone alone rides the crests, hollows nothing, and slowly erases the geometry that makes the knife work (sharpening approach is trade knowledge; no Hyde recommendation for this edge exists in the record). That maintenance asymmetry is real and this store says it plainly: the plain-edged 60115 hones flat in seconds, and this knife asks for two more minutes of attention — the price of an edge that batts cannot clamp. Wipe the blade dry after damp work; carbon steel keeps score.
Asked before buying
BUYER QUESTIONS, ANSWERED BEFORE YOU ORDER
Is the blade serrated?
Hyde's word is wave — "wave blade design cuts foam core and most other insulation materials without binding" — and this store uses Hyde's word only; no finer edge geometry is in the record .
Will it cut rigid foam board?
Yes — full-depth passes, curves, faced board, and thick stock are its side of the border. Straight score-and-snap cuts in thinner board go faster with a snap-off utility blade, and crews carry both.
What about mineral wool?
The claim covers "most other insulation materials," and mineral wool cuts with the same compress-and-slice method and the same PPE as glass. Denser boards of it reward the extra pass discipline in 2e.
How do I sharpen a wave edge?
Follow the scallops — round rod or slack strop, curve by curve — and skip flat-stone-only habits, which erode the geometry (trade guidance; no Hyde recommendation on record). Expect frequent touch-ups: glass fiber is brutally abrasive, and the claimed high-carbon steel blade is built to be brought back, not thrown away.
Why is there no point?
Because everything behind an insulation cut — wiring, sheathing, vapor barrier, hands — must survive the stroke. The blunt square end is the safety system, inherited from the family and most valuable here.
Do I need a mask to cut fiberglass?
For sustained, enclosed, or overhead work, yes — N95-class minimum, with sealed eyewear when fiber can fall; gloves and sleeves always; cold-water wash after . Section 2g carries the full block.
