By The Roofing Brief Team. Last reviewed: October 2026.
The best roofing knife for most crews in 2026 is the Milwaukee Fastback 48-22-1502, a folding press-and-flip utility knife that opens one-handed, stores five spare blades onboard, and accepts standard 2-1/2 inch hook blades for shingle work. U.S. retailers list it at roughly $13 to $18. The ranking covers four roofing knives and one budget setup, each with the job it does best, plus two purpose-built roofing knives from Stortz and Estwing, a spec table, and a blade-by-material decision table.
A roofing knife is a utility knife set up to run a curved hook blade, usually the standard 2-1/2 inch size such as DEWALT’s DWHT11134 bi-metal roofing blade, for trimming shingles at valleys and rakes, scoring underlayment, cutting ice and water shield, and slicing membrane. The three specs that separate one from a box cutter are a tool-free blade change, a hook-blade-compatible holder, and onboard spare blade storage.
How we picked the best roofing knives
This is an editorial ranking compiled from manufacturer specifications and product pages and from public retailer listings. We did not run hands-on tests, and we did not score user reviews. We ranked the knives on four published criteria: how the blade changes (tool-free or not), whether the knife accepts standard 2-1/2 inch hook blades, onboard blade storage, and body construction. Prices are approximate U.S. retail listings checked in October 2026 and shift by retailer and promotion.
Two features separate a roofing knife from a generic box cutter. First, tool-free blade change, because a dull blade tears shingle granules instead of cutting them; the Milwaukee 48-22-1502 carries 5 spares and the Stortz HAMMRHEAD 7. Second, the ability to run a hook blade, the curved blade roofers use to pull-cut asphalt shingles without digging into the underlayment below.
Best roofing knives for 2026 at a glance
| Knife | Type | Best for | Hook blade | Blade change | Typical price |
|---|---|---|---|---|---|
| Milwaukee Fastback 48-22-1502 | Folding, press-and-flip | Best overall for roofers | Yes (standard 2.5 in) | Tool-free, one-handed | ~$13 to $18 |
| Hyde 20550 | Fixed blade, 5 degree offset | Dedicated flooring and roofing cuts | No (fixed 2-1/2 in blade) | None (fixed blade) | ~$14 to $22 |
| Stanley FatMax 10-778 | Retractable | Best value classic | Yes (standard 2.5 in) | Tool-free push button | ~$12 to $17 |
| Olfa MXP-AL 18mm | Snap-off, aluminum | Deep cuts in thick membrane and insulation | No (18mm snap-off only) | Snap segment / reload | ~$18 to $25 |
| Budget setup: any standard utility knife plus a hook-blade pack | Retractable or folding | Occasional shingle cuts | Yes (add a hook-blade pack) | Depends on the knife | Varies |
Roofing knife specs compared, by model number
Each row gives the maker’s published spec and the document it comes from; a blank cell means no published figure.
| Model | Blade | Onboard spares | Body | Notable feature | Source |
|---|---|---|---|---|---|
| Milwaukee Fastback 48-22-1502 | Standard utility blades (hook or straight) | 5 | Metal | Press-and-flip open, gut hook, wire stripper, wire belt clip | Milwaukee product page |
| Stortz HAMMRHEAD (SKU 36-289) | Hook blade, 3 included | 7 | Cast zinc, 1040 steel hammer insert | Nose magnet, lanyard hole, 0.96 lb, $60 list | Stortz product page |
| Estwing RK-7 | Replaceable blades | Plated heavy-gauge steel casing | Made in the U.S.A., cuts rolled roofing and shingles | Estwing product page | |
| Stanley FatMax 10-778 | Standard utility blades, 5 included | Integrated storage | Metal with rubber grip | 3-position retractable blade, 6-5/8 in long | Stanley product listings |
| Hyde 20550 | Fixed 2-1/2 in chrome vanadium, 0.072 in, hollow ground | None | Soft-grip handle, finger guard | 5 degree offset blade | Hyde catalog listing via retailers |
| Olfa MXP-AL | 18mm snap-off, UltraSharp Black | None | Die-cast aluminum, stainless steel channel | Auto-lock with click stops | OLFA MXP sell sheet |
| DEWALT DWHT11134 (blades) | 2-1/2 in (64mm) bi-metal hook, 5-pack | n/a | n/a | Rated for shingles, felt, underlayment, foam board, insulation | DEWALT product page |
Purpose-built roofing knives: Stortz HAMMRHEAD and Estwing RK-7
Two knives sold specifically as roofing knives sit outside the ranking because they cost more or publish fewer specs. The Stortz HAMMRHEAD (SKU 36-289) is a hook-blade knife with a 1040 medium-grade steel hammer insert in the handle, a cast zinc body, a nose magnet that holds the blade, storage for 7 spare blades and a lanyard hole for tying off at height; Stortz lists it at $60. The Estwing RK-7 is a solid steel roofing knife with a plated heavy-gauge steel casing and replaceable blades, made in the U.S.A.; Estwing does not publish a blade length or price on its product page.
1. Milwaukee Fastback 48-22-1502: best roofing knife overall
The Milwaukee Fastback 48-22-1502 is our top pick because it combines fast one-handed opening, tool-free blade swaps, and onboard storage for five spare blades, so a roofer can change a dull hook blade without leaving the work area. U.S. retailers list it at roughly $13 to $18, and Milwaukee specifies a metal body and a wire belt clip.
The press-and-flip mechanism opens the folding blade with one hand, which matters when your other hand is holding a shingle or a ridge. It runs standard 2-1/2 inch utility blades, so you can load Milwaukee hook blades for shingles or straight blades for underlayment on the same knife. An integrated gut hook and onboard wire stripper add utility for mixed jobs.
Best for: production roofers who want one folding knife that runs both hook and straight blades. Pros: one-handed open, 5-blade storage, metal body, about $13 to $18. Cons: as with any folding knife, the pivot can pick up granule grit, so blow it out now and then.
2. Hyde 20550: best dedicated roofing and flooring knife
The Hyde 20550 is a fixed-blade knife that Hyde sells as a flooring and roofing knife. Per the catalog listing it has a heavy-duty 2-1/2 inch by 0.072 inch chrome vanadium steel blade, hollow ground to reduce binding, set at a 5 degree offset, with a soft-grip handle and finger guard. U.S. retailers list it at roughly $14 to $22. With no slide or folding pivot, there is no mechanism for granule dust to jam.
Because the 2-1/2 inch blade stays fixed and exposed, this is a specialist, not a pocket-safe everyday carry. It does not take replaceable utility blades, so you keep the edge sharp with a stone instead of swapping blades, and it cannot switch to a hook profile the way a utility knife can.
Best for: crews who want a single-purpose fixed knife with nothing to break. Pros: no mechanism to clog, heavy blade stock, about $14 to $22. Cons: always-exposed blade needs a sheath, no hook-blade option, not suited to mixed-material work.
3. Stanley FatMax 10-778: best value classic utility knife
The Stanley FatMax 10-778 retractable utility knife is the low-cost workhorse, listed by U.S. retailers at roughly $12 to $17, and it accepts the same standard 2-1/2 inch hook and straight blades as the Milwaukee. Stanley specifies a metal body, push-button blade change, a three-position retractable blade, and integrated blade storage, and it is cheap enough to keep several on a truck.
On the Stanley FatMax, the three-position retractable slide protects the blade for pocket carry and lets you set exposure depth, which helps when scoring rather than cutting through. It changes blades tool-free and accepts a standard hook blade, making it a fair alternative to the Milwaukee if you prefer a straight retractable body over a folding one.
Best for: buyers who want a proven, inexpensive retractable knife they can buy in multiples. Pros: metal body, about $12 to $17, universal blades, depth control, onboard blade storage. Cons: blade change is a push-button swap rather than the Milwaukee’s one-handed flip; a slide mechanism can pick up tar and grit, so keep it clean.
4. Olfa MXP-AL 18mm: best for deep cuts in membrane and insulation
The Olfa MXP-AL 18mm is a die-cast aluminum snap-off knife that shines when you need a long, deep cut through thick single-ply membrane, ISO insulation board, or stacked underlayment. Retailers list it at roughly $18 to $25. Olfa’s MXP sell sheet specifies a slim aluminum handle, a stainless steel blade channel, an auto-lock that clicks at each stop, and a preloaded UltraSharp Black snap-off blade, so the extendable 18mm blade can reach further than a short utility blade for deep cuts.
The trade-off is that the Olfa MXP-AL’s 18mm snap-off blades do not take a curved hook profile, so this is a straight-cut specialist rather than a shingle knife. When a segment dulls, you snap it off to expose fresh edge instead of swapping a whole blade, which keeps a sharp edge available on low-slope and flat-roof membrane work.
Best for: low-slope and commercial crews cutting membrane, foam board, and underlayment. Pros: deep reach, aluminum body, snap-to-refresh edge, about $18 to $25. Cons: no hook-blade option, snapped segments are a jobsite hazard if not collected.
5. Budget setup: a standard utility knife plus hook blades
For a homeowner or a new hand who needs to cut shingles a few times a year, the cheapest roofing-ready setup is a standard utility knife you may already own plus a pack of 2-1/2 inch hook blades. Several blade makers sell hook blades for roofing. For example, DEWALT lists its DWHT11134 roofing blades as 2-1/2 inch (64mm) bi-metal hook blades in a 5-pack for cutting shingles, felt paper, underlayment, foam board and insulation, and Milwaukee and Husky sell hook-blade dispenser packs.
Check that your knife is rated for standard 2-1/2 inch utility blades and that the blade lock holds firmly before you work on a roof. Pro crews will want one of the bodies above, but this route puts the correct pull-cutting hook geometry in your hand cheaply, which beats forcing a straight blade through asphalt shingles.
Best for: DIYers and occasional users. Pros: lowest cost, since a DEWALT DWHT11134 5-pack is the only purchase if you already own a knife. Cons: blade lock and body quality depend on the knife you start with.
Hook blade or straight blade for roofing?
Use a hook blade for asphalt shingles and rolled roofing, and a straight blade for underlayment, ice and water shield, and clean trims. A 2-1/2 inch hook blade has a curved cutting edge that pulls through the back of the material, so it slices shingles without gouging the felt or deck beneath. A straight blade scores and cuts flat stock faster but wants to dig in on layered shingle. For the cuts themselves at rakes, valleys and starter strips, see our guide on how to cut shingles.
Blade material affects how long the edge lasts on abrasive granules: DEWALT sells its DWHT11134 roofing hook blade in bi-metal, and OLFA markets its black snap-off blades as 25 percent sharper than its silver blades. Standard roofing hook blades measure about 2-1/2 inches and fit any knife rated for standard utility blades.
- Match blade to material. Hook blade for shingles and membrane pull cuts, straight blade for felt and flashing tape.
- Change at the first tear. When granules tear instead of slicing, the edge is done. Swap it rather than force it.
- Keep spares onboard. A knife with blade storage saves trips down the ladder.
- Collect snapped and spent blades. Loose blades on a roof become punctures and injuries.
Roofing knife decision table
| If you are cutting | Use this blade | Knife that fits |
|---|---|---|
| Asphalt shingles, starter, ridge cap | 2-1/2 in hook blade (for example DEWALT DWHT11134) | Milwaukee 48-22-1502, Stanley 10-778, Stortz HAMMRHEAD |
| Rolled roofing | Hook blade | Estwing RK-7 (maker lists rolled roofing) or any hook-blade knife |
| Felt, synthetic underlayment, ice and water shield | Straight 2-1/2 in utility blade | Milwaukee 48-22-1502 or Stanley 10-778 |
| Foam board or ISO insulation thicker than a utility blade’s reach | 18mm snap-off | Olfa MXP-AL |
| Single-ply membrane on a low-slope roof | Straight or 18mm snap-off | Olfa MXP-AL |
| You also hand-nail and want one tool on the belt | Hook blade | Stortz HAMMRHEAD (steel hammer insert) |
| A few shingle cuts a year | Hook-blade pack | The utility knife you already own |
Which roofing knife should you buy?
Buy the Milwaukee Fastback 48-22-1502 if you want one knife that does everything a roofer needs, since it runs both hook and straight blades and changes them one-handed. Pick the Hyde 20550 if you want a fixed flooring and roofing knife with no mechanism to fail. Choose the Stanley FatMax 10-778 for a cheap, proven retractable you can buy in bulk.
Go with the Olfa MXP-AL if your work is low-slope membrane and insulation that needs deep straight cuts, and a standard utility knife with a hook-blade pack if you are an occasional user. For a fuller kit, see how a knife fits alongside the rest of your roofing tools and equipment, and pair it with a magnetic roofing hammer for hand-nailing. A sharp hook knife also speeds the cuts described in our guide to installing ridge cap shingles and any DIY roof replacement.
Frequently asked questions
What kind of knife do roofers use?
Most roofers use a utility knife loaded with a curved hook blade for cutting asphalt shingles, plus a straight blade for underlayment and flashing tape. Common picks include the Milwaukee Fastback, the Stanley FatMax, and fixed-blade flooring and roofing knives like the Hyde 20550. The knife matters less than running the correct blade for the material.
Are hook blades better than straight blades for shingles?
Yes, for asphalt shingles a 2-1/2 inch hook blade is usually better. Its curved edge pulls through the shingle and cuts from the back, so it slices cleanly without digging into the felt or deck underneath. Straight blades work for scoring flat underlayment and trimming, but they tend to gouge layered shingle and dull faster on granules.
How often should you change a roofing knife blade?
Change the blade as soon as it tears granules instead of slicing, which on a busy tear-off can mean several swaps a day. A dull blade forces you to press harder, which reduces control and raises the risk of a slip. A knife with onboard storage, such as the 5-blade Milwaukee 48-22-1502, makes frequent changes practical.
What is the best blade for cutting asphalt shingles?
A 2-1/2 inch hook blade is the standard choice for asphalt shingles. Blade makers sell hook blades made for abrasive roofing stock; DEWALT, for example, lists its DWHT11134 roofing blades as 2-1/2 inch bi-metal hook blades for shingles, felt paper, underlayment, foam board and insulation. Any knife rated for standard utility blades will accept these hook blades.
Can you use a regular utility knife for roofing?
Yes, a regular utility knife works for roofing as long as it accepts a standard 2-1/2 inch hook blade for shingles and changes blades easily. The main upgrades a roofing-focused knife adds are faster one-handed blade changes, onboard blade storage, and a secure blade lock. A basic retractable knife with hook blades handles occasional jobs fine.