EU Box Profile Variations (18/1000, 35/1000, 45/1000 Guide)

EU Box Profile Variations

Complete European Trapezoidal Roofing Guide

In Europe, trapezoidal profiles are commonly referred to as:

Height / Effective Cover

Example:

35/1000 means:

• 35 mm rib height

• 1000 mm effective cover width

This naming system is widely used across:

• Germany
• Netherlands
• Poland
• Belgium
• Spain
• France
• Scandinavia

1️⃣ Common EU Box Profile Families

Most common variations:

• 18/1000
• 20/1100
• 25/1000
• 30/1000
• 35/1000
• 40/1000
• 45/1000
• 50/1000

Each variation serves different structural purposes.

2️⃣ 18/1000 Profile

Low rib height (18 mm).

Used mainly for:

• ✔ Wall cladding
• ✔ Light roofing
• ✔ Interior applications

Lower structural capacity.

Common thickness:

0.5 mm
0.63 mm

3️⃣ 25/1000 Profile

Medium-light duty profile.

Used for:

• ✔ Roofing small spans
• ✔ Agricultural buildings
• ✔ Wall panels

Offers improved stiffness compared to 18 mm profile.

4️⃣ 30/1000 Profile

Very common across Central Europe.

Balanced between:

• ✔ Drainage performance
• ✔ Structural strength
• ✔ Cost efficiency

Often used in:

✔ Industrial roofing
✔ Warehouses

5️⃣ 35/1000 Profile (Highly Popular)

One of the most common EU industrial roofing profiles.

Characteristics:

• 35 mm rib height

• 1000 mm effective cover

• 5 trapezoidal ribs typical

Used for:

• ✔ Industrial buildings
• ✔ Commercial warehouses
• ✔ Agricultural roofing

Thickness:

0.5–0.75 mm typical
Up to 1.0 mm in heavy duty use.

6️⃣ 40/1000 & 45/1000 Profiles

Deeper rib height.

Used when:

• ✔ Longer spans required
• ✔ Higher snow load (Northern Europe)
• ✔ Increased drainage required

Common in:

• Germany
• Poland
• Scandinavia

Higher rib height improves section modulus.

7️⃣ 50/1000 Profile

Heavy-duty trapezoidal.

Used in:

• ✔ Industrial
• ✔ High snow zones
• ✔ High wind regions

Often 0.7–1.0 mm thickness.

8️⃣ 1000 mm vs 1050 mm vs 1100 mm Cover

While 1000 mm is most common, some markets use:

1050 mm effective cover
1100 mm effective cover

Wider cover reduces panel count but may:

✔ Reduce stiffness
✔ Increase oil canning risk

Machine design must match target cover width.

9️⃣ Rib Pitch Variations

Most EU 1000 mm profiles use:

5 rib design → 200 mm pitch

Some use:

6 ribs → narrower pitch
4 ribs → wider pitch

Pitch affects:

• ✔ Water drainage
• ✔ Structural strength
• ✔ Aesthetic appearance

🔟 Common Thickness in EU Market

Typical BMT:

Thickness	Application
0.5 mm	Standard roofing
0.63 mm	Industrial roofing
0.75 mm	Heavy duty
0.88–1.0 mm	Structural applications

Snow load regions often require thicker material.

1️⃣1️⃣ Steel Grade in EU

Common grades under EN 10346:

• S250GD
• S320GD
• S350GD
• S450GD
• S550GD

S350GD widely used for industrial roofing.

Higher grades allow reduced thickness.

1️⃣2️⃣ Coating Standards in Europe

Common coatings:

• Z275
• Z350
• AZ150

Coating selection often tied to:

Corrosion classification C1–C5.

Coastal regions (Spain, Italy, Netherlands coast) may require heavier coating.

1️⃣3️⃣ Structural Behavior

As rib height increases:

• ✔ Section modulus increases
• ✔ Load capacity increases
• ✔ Deflection reduces

Deeper profiles allow:

Longer purlin spacing.

But require:

Wider developed width.

1️⃣4️⃣ Developed Width Implications

Example:

35/1000 profile may require:

~1200–1250 mm coil width depending on geometry.

45/1000 profile:

Often 1250–1350 mm developed width.

Machine max width must accommodate.

1️⃣5️⃣ Machine Requirements for EU Box Profiles

Machines targeting EU should support:

• ✔ 1000–1100 mm effective cover
• ✔ Up to 50 mm rib height
• ✔ 0.5–1.0 mm thickness
• ✔ S350GD forming
• ✔ Z275 & AZ150 coatings

Structural deck machines require heavier capacity.

1️⃣6️⃣ Snow Load & Wind Considerations

Northern Europe:

High snow loads → deeper ribs preferred.

Coastal Europe:

High wind uplift → thicker material.

Profile choice often climate-driven.

1️⃣7️⃣ Common Mistakes in EU Market

• ❌ Confusing effective cover with overall width
• ❌ Ignoring developed width in machine design
• ❌ Using too low coating in coastal region
• ❌ Supplying non-EN compliant grade
• ❌ Designing US 36" cover for EU market

EU market is metric and EN-driven.

1️⃣8️⃣ Engineering Summary

Common EU box profiles:

• ✔ 18/1000
• ✔ 25/1000
• ✔ 30/1000
• ✔ 35/1000
• ✔ 40/1000
• ✔ 45/1000
• ✔ 50/1000

Standard material:

• ✔ 0.5–0.75 mm
• ✔ S350GD
• ✔ Z275 or AZ150

EU trapezoidal profiles are:

• Metric-based
• Height/cover named
• Climate influenced
• Structurally optimized

FAQ Section

What does 35/1000 mean?

35 mm rib height, 1000 mm effective cover.

Is 1000 mm standard in Europe?

Yes, very common.

What thickness is typical?

0.5–0.75 mm for roofing.

What grade is used?

S350GD widely used.

Is 45/1000 stronger than 35/1000?

Yes, due to increased rib height.

Does deeper rib require wider coil?

Yes — developed width increases.