Cordless reciprocating saws like the Milwaukee 2821-20 M18 FUEL and the DeWalt DCS389 FlexVolt now outcut corded recip saws on roofing tear-off work, once you factor in setup time, cord drag, and GFCI trips. A 2-man tear-off crew saves an average of 45 minutes per house going fully cordless — enough to add a 4th house to a week with no extra labor.
What changed in the last 3 years
Pre-2022, cordless reciprocating saws were noticeably slower than corded on sustained tear-off. Battery sag under load meant 4-6 shingles at full speed then a slowdown as the pack voltage dropped.
Milwaukee HO batteries (12.0Ah HO, FORGE) and DeWalt FlexVolt 9.0Ah changed the math. These packs hold nominal voltage under sustained draw long enough to cut an entire roof's worth of tear-off on 2-3 batteries.
The time savings nobody adds up
Corded setup: pull generator out of truck (2 min), start generator (1-2 min), run 50-100 ft extension cord to ladder (3-5 min), rig GFCI if needed (2 min). Total before first cut: 8-11 minutes.
Cordless setup: pull saw + 2 batteries out of PACKOUT box, climb ladder. Total before first cut: 30-60 seconds.
End of day: reverse the corded setup for 5-8 more minutes. Cordless: clip the battery back on the charger, done.
On a 2-story residential tear-off (800 sq ft roof), corded vs. cordless saves 18-25 minutes per crew per day on setup/teardown alone.
Which cordless recip to choose
Milwaukee 2821-20 M18 FUEL SAWZALL: 3,000 SPM, 1-1/4" stroke, ORBITAL setting. The industry standard for roofing work. $149 bare.
Milwaukee 2822-20 M18 FUEL SUPER HATCHET: compact body, 1-1/8" stroke, meant for tight spaces and overhead work on roofing. $179 bare.
DeWalt DCS389 FlexVolt 60V SAWZALL: 3,000 SPM, 1-1/8" stroke. Corded-equivalent power. $229 bare (needs FlexVolt battery).
For a 2-man roofing crew, two 2821-20s + 4x 12.0Ah HO batteries + dual-bay charger = full-day tear-off capability. ~$800-900 bare tools; $1,100-1,200 with batteries.
Nail-cut blades matter
A cheap bi-metal blade on shingle-nail tear-off lasts 15-20 feet of cutting. A Milwaukee TORCH Nail Cutter blade (48-01-7186) lasts 80-100 feet. That's the difference between 2 blade changes per roof and 8 blade changes per roof.
Blades are consumables — spend the extra $5-7 per blade on nail-cutters. Saves more time than any tool upgrade.
Joshua runs Charged Tools out of St. Louis. Background spans e-commerce operations, software engineering, and hands-on tool use in the auto trades. Every editorial piece on this site is written or reviewed by Joshua before it ships.
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FAQ
What battery runtime should I expect for roofing tear-off?+
On a Milwaukee 12.0Ah HO: ~80-120 feet of sustained shingle-nail cutting (full roof tear path is 200-400 feet depending on layout). Plan on 2-3 batteries per roof; 4+ if it's multi-layered tear-off.
Can I use a cordless recip saw on the ridge cap?+
Yes, but the Milwaukee 2822-20 HATCHET is better for ridge work than the full-size 2821-20 — shorter, lighter, better overhead balance. Many crews carry both: 2821-20 for tear-off, 2822-20 for trim and ridge cuts.
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