How to Specify an AG Panel Roofing Profile (Complete Guide)

Learn how to specify an AG panel profile including finished dimensions, typical coil width, thickness range, material grade and machine requirements.

Complete Engineering & Procurement Guide

AG Panel (Agricultural Panel) is typically used for:

• Agricultural barns

• Equipment sheds

• Light commercial buildings

• Residential metal roofing

It is usually:

• Exposed fastener

• Lower rib height than R-Panel or PBR

• Economical

• Designed for lighter structural loads

But AG Panel is not universal — dimensions vary by region.

1️⃣ What Defines an AG Panel?

Typical U.S. AG Panel characteristics:

• 36” effective cover width

• Rib height: ¾” to 1” (19–25 mm)

• Rib spacing: 9” centers (approx. 229 mm)

• Minor ribs between major ribs

• No purlin bearing leg

AG Panel is lighter-duty than R-Panel or PBR.

Always request the exact cross-section drawing.

2️⃣ Standard Finished Dimensions (U.S. Example)

Common U.S. AG Panel:

• Effective cover width: 36”

• Overall formed width: ~37–38”

• Rib height: ¾” (19 mm) or 1” (25 mm)

• Rib pitch: 9” centers

• Minor ribs between majors

Metric variants:

• 1000 mm cover

• Rib heights 20–30 mm

• Rib pitch 200–250 mm

Never assume all AG panels are identical.

3️⃣ Typical Coil Width

For standard 36” AG Panel:

Typical developed coil width:

1000–1100 mm range (depending on geometry)

Because rib height is lower than PBR:

Developed width is usually slightly less.

Metric 1000 mm cover AG:

Typically 1100–1200 mm coil.

Exact developed width must be calculated using:

Bend allowance
Thickness
Springback compensation

Never guess coil width.

4️⃣ Thickness Range (Market Standards)

AG Panels are generally lighter gauge than R-Panel.

Typical thickness:

Residential / Agricultural:

• 29 gauge (~0.36–0.40 mm)

Commercial light duty:

• 26 gauge (~0.45–0.50 mm)

Heavy agricultural:

• 24 gauge (~0.60 mm)

22 gauge is rare for AG due to low rib height.

Machine must be designed for:

Maximum thickness + maximum grade.

5️⃣ Material Grade

Common grades:

USA:

• ASTM A653 Grade 33

• ASTM A653 Grade 50 (less common for AG)

International:

• G250

• G350

G550 is rarely used for AG because:

Low rib height limits structural benefit.

Higher grade increases:

Springback
Forming pressure
Motor load

Always specify grade before tooling design.

6️⃣ Coating Type

Common AG coatings:

• G60 galvanized

• G90 galvanized

• AZ50 Galvalume

• Prepainted (SMP most common)

Agricultural environments may require:

Higher corrosion resistance.

Coating type influences roll surface finish requirements.

7️⃣ Rib Height & Structural Implications

AG rib height (¾”–1”) is lower than R-Panel (1¼”).

Lower rib height means:

Lower structural stiffness
Lower wind uplift capacity
Lower span capability

AG Panel is not suitable for:

High wind zones without engineering validation.

Rib height must match intended structural use.

8️⃣ Rib Spacing & Minor Ribs

Typical spacing:

9” centers (U.S.)

Minor ribs increase:

Panel stiffness
Aesthetic appeal
Water channel performance

Specify:

Number of minor ribs
Exact spacing

Small differences change developed width.

9️⃣ Overlap & Fastener Configuration

AG Panel uses exposed fasteners.

Specify:

• Side lap detail

• Fastener placement

• Sealant compatibility

Overlap geometry directly affects water tightness.

Incorrect side lap design causes leakage.

🔟 Machine Engineering Considerations

Typical AG Panel roll forming line:

• 12–16 forming stands

• 60–75 mm shafts

• 11–18.5 kW motor

• Hydraulic stop cut standard

Because rib height is lower:

Forming load is slightly lower than R-Panel.

However, grade and thickness still dictate motor and shaft size.

1️⃣1️⃣ Production Speed

Typical speeds:

15–25 m/min standard
30 m/min possible for light gauge

High speed requires:

Flying shear.

For agricultural markets, moderate speed is usually sufficient.

1️⃣2️⃣ Tolerance Requirements

AG Panel typical tolerances:

• Width ±2–3 mm

• Rib height ±1 mm

• Length ±2–5 mm

Agricultural applications are slightly less strict than architectural.

But excessive deviation affects installation alignment.

1️⃣3️⃣ Climate Considerations

AG Panel often used in:

Rural, agricultural environments.

Must consider:

Ammonia exposure (livestock buildings)
High humidity
Coastal corrosion

Material grade and coating should match environment.

1️⃣4️⃣ Developed Width Reminder

Developed width must include:

• Bend radii

• Material thickness

• Springback correction

Incorrect developed width leads to:

Incorrect coil procurement
Material waste
Production interruption

Always calculate from approved drawing.

1️⃣5️⃣ Export Considerations

In Latin America & Africa:

AG-style panels may use:

1000 mm cover
Different rib height
Different pitch

Never export U.S. 36” AG without confirming local market expectations.

1️⃣6️⃣ Common Specification Mistakes

❌ Saying “AG panel” without rib height
❌ Not confirming ¾” vs 1” rib
❌ Ignoring grade
❌ Guessing coil width
❌ Not defining overlap
❌ Assuming structural performance

Most machine mismatches start here.

1️⃣7️⃣ AG Panel vs R-Panel Summary

Always define which is required.

1️⃣8️⃣ Final AG Panel Specification Checklist

Before tooling or machine approval:

✔ Effective cover width
✔ Rib height
✔ Rib spacing
✔ Minor rib configuration
✔ Thickness range
✔ Steel grade
✔ Coating type
✔ Developed width
✔ Coil availability
✔ Production speed target
✔ Climate requirements

Only then proceed.

FAQ Section

Is AG Panel always 36” cover?

In U.S. markets yes, internationally varies.

Can I use G550 for AG?

Possible, but rarely necessary.

What is typical coil width?

Usually 1000–1100 mm range for 36” cover, but must be calculated.

Is AG suitable for high wind zones?

Not without structural verification.

Is 29 gauge strong enough?

For agricultural sheds yes, for commercial maybe not.

Can I upgrade to thicker gauge later?

Only if machine is designed for maximum thickness.