B Deck Roll Forming Machine

Short answer: A B deck roll forming machine produces the 1.5 inch structural deck that US commercial roofs and composite floors are built on. It forms 36 inch panels from 22 to 16 gauge galvanised coil at 12 to 30 m/min, with a nesting sidelap that locks panel to panel on site.

A B deck roll forming machine is a dedicated line, not a converted roofing mill. Six wide ribs at 6 inch centres, a 1.5 inch rib depth, and geometry stiff enough to carry wet concrete between joists. Every module on the line follows from those numbers.

What the B Deck Roll Forming Machine Produces

B deck is a wide rib structural panel. The rib is 1.5 inch deep, the pitch is 6 inch on centre, and six ribs give 36 inch of coverage. Top flange 3.5 inch, bottom flange 2.5 inch, which is why insulation boards sit flat instead of sagging between ribs.

Profile property	B deck value
Rib depth	1.5 inch (38 mm)
Coverage width	36 inch (914 mm)
Rib count and pitch	6 ribs at 6 inch centres
Top flange / bottom flange	3.5 inch / 2.5 inch
End lap	1.75 inch nesting sidelap
Coil gauges	22, 20, 18 and 16 gauge
Steel grades	33 to 80 ksi yield, G60 or G90 galvanised

The 3.5 inch flange carries the insulation, the 1.5 inch rib carries the moment, and the sidelap carries the diaphragm shear. A B deck roll forming machine that misses any of the three ships deck that fails inspection.

B Roof Deck and B Floor Deck Come Off the Same Line

Roof and floor deck share one profile. Dimensions are identical. What changes is coil thickness, sidelap detail, and whether panels carry embossments for composite action.

Item	B roof deck	B floor deck
Coil thickness	0.3 to 0.8 mm (22 to 20 ga)	0.8 to 1.5 mm (20 to 16 ga)
Cutoff load	Light, hydraulic shear is enough	Heavy, needs a reinforced frame
Embossment	None	Formlok pattern for concrete bond
Sidelap	Nesting lap, screwed or welded	Nesting lap plus shear studs
Typical span	3 to 10 ft between joists	Set by the slab design

A floor deck order pushes buyers toward a heavier B deck roll forming machine. Going from 0.8 mm to 1.5 mm adds load to every station, so shafts, bearings and the shear cylinder all step up. Budget a B deck roll forming machine for the thickest coil, never the average.

If your book mixes deck with deeper structural profiles, the steel floor deck roll forming machine page covers 75 mm composite sections. Buyers comparing floor systems should read the mezzanine floor roll forming guide before locking a rib height.

Line Configuration from Coil to Bundle

A standard B deck roll forming machine runs on one straight axis. Coil enters at one end, formed panel leaves at the other, and every module between is sized for 1.5 mm steel at full width.

Module	Standard specification	What it does
Hydraulic uncoiler	10 ton, with coil car	Pays off coil under controlled tension
Feeder and guide	Entry pinch rolls plus edge guides	Keeps strip centred before station one
Roll former	24 to 28 stations, 90 mm shafts	Forms six ribs and both sidelap legs
Embossing section	Optional, 4 to 10 stations	Adds the Formlok pattern for floor deck
Cutoff	Hydraulic or flying shear	Cuts to length, stopped or on the move
Runout table	6 to 12 m, manual or automatic	Receives panels, builds bundles
Control cabinet	PLC with length and batch counter	Sets cut length, quantity and speed

Three modules decide whether the line earns money. The shear decides speed, the stacker decides labour, the uncoiler decides how much coil handling fills each shift.

Technical Parameters

These numbers hold for a standard B deck roll forming machine. Anything outside them is a custom build, and we quote it as one.

Parameter	Specification
Raw material	PPGI, GI, PPGL, GL
Coil thickness	0.3 to 0.8 mm roof deck, 0.8 to 1.5 mm floor deck
Forming stations	24 to 28
Shaft	40 Cr, 90 mm diameter, keyed
Rollers	GCr15, heat treated, surface chromed
Main motor	22 kW x 2, chain or gearbox drive
Forming speed	12 to 30 m/min, set by the cutoff
Profile tolerance	Rib height within 1 mm, coverage within 3 mm
Power supply	380 V 50 Hz three phase, or matched to site
Control	PLC, inverter drive, batch and length presets

The 90 mm shaft is what buyers under-specify most. A 1.5 mm floor panel at 36 inch width puts real torque into the shaft, and a 70 mm shaft deflects enough to show in rib height.

Speed, Output and What Limits Them

Speed on a B deck roll forming machine follows the cutoff, not the motor. The forming section can always outrun the machine’s ability to stop a moving panel.

• Hydraulic shear. Up to 15 m/min. The line stops for each cut, so every panel costs a restart.
• Flying shear. 20 to 30 m/min. Cuts on the move, which suits fixed contractor orders.
• Rotary shear. Above 35 m/min. Only worth it when the line runs most of the week.

At 20 m/min for eight hours, a B deck roll forming machine makes about 9,600 m of panel. At 36 inch coverage that is roughly 94,500 sq ft per shift. A hydraulic shear at 12 m/min lands near 56,000 sq ft, so the shear moves plant capacity more than the motor does.

Coil changeover is the hidden cost on any B deck roll forming machine. A 10 ton coil at 1.5 mm yields about 1,600 m of panel. Two fitters with a coil car change it in 8 to 12 minutes. Without a coil car, double it.

How to Specify a B Deck Roll Forming Machine

1. Fix the thickest coil first. Order for 1.5 mm even if year one runs 0.9 mm. Retrofitting shafts and a shear frame costs more than the upgrade.
2. Choose the cutoff by volume. Under 15 m/min, hydraulic. Between 15 and 30, flying. Above 35, rotary.
3. Decide on embossing now. Adding a Formlok section later means a new stand and a line re-alignment.
4. Size the runout to your lifting method. A 6 m table suits forklifts. Bundles above 12 m need a stacker.
5. Confirm the electrical standard. US sites run 480 V three phase, so cabinet and motors are built to match.

Buyers who also form roofing usually order both from one supplier to keep tooling and spares consistent. Our roofing sheet roll forming machine buy guide covers that, and the US roll forming machine market guide explains the voltage, gauge and documentation American buyers expect.

Standards, Tolerances and Compliance

B deck is a structural product, so the paper trail matters as much as the profile. The governing document is the ANSI/SDI SD-2022 Standard for Steel Deck, which consolidated the earlier roof, floor and composite standards and is referenced by the International Building Code.

Coil falls under ASTM A653 for galvanised sheet, G60 standard and G90 for coastal work. Diaphragm values follow AISC practice, and rated assemblies are listed through UL. Every B deck roll forming machine ships with mill certificates, profile drawings and a dimensional report.

Our quality system is ISO 9001 certified and the machines carry CE marking for export. The tolerance we hold is tighter than the standard requires, because a panel 4 mm wide will not nest on the third run.

Why Believe Industry

We have built roll forming machines since 2005, with more than 15 years in structural deck and over 500 projects in more than 50 countries. The engineering team runs 80 plus people, which is why a custom deck profile is not a six month experiment.

Deck work is familiar here. We have shipped B deck roll forming machines to the US, Mexico, Australia and the Middle East, and we know American buyers want 480 V, imperial drawings and a shear that holds length within 3 mm. Those details sit in the quotation, not in a later change order.

If your requirement sits outside the standard B profile, the customized profile roll forming machine range covers hat sections and interlocking panels. The wider roll forming machine catalogue shows the full line up by category.

Frequently Asked Questions about B Deck Roll Forming Machine

Last updated: 31 October 2026. Article changelog: profile dimensions corrected and verified against ANSI/SDI SD-2022, the 2023 promotional title replaced, dead outbound domain removed, four specification tables and eight buyer questions added. Next review triggers: SDI standard revision, coil gauge range change beyond 22 to 16 ga, or a shift in US deck demand toward deeper profiles.