Roofing Profiles Used in the UK (Box, Corrugated & Standing Seam

The UK roofing market differs significantly from the USA.

Roofing Profiles Used in the UK

Complete Technical & Market Guide

The UK roofing market differs significantly from the USA.

Key differences:

• Metric dimensions (mm, not inches)

• Trapezoidal “box profile” dominance

• Strong agricultural and industrial demand

• BS EN standards compliance

• U-value and insulation requirements

Understanding UK roofing profile standards is critical for:

• Machine manufacturers

• Coil exporters

• Panel producers

• Building specifiers

1️⃣ The Most Common UK Roofing Profile Types

The UK market is dominated by:

1. 32/1000 Box Profile

2. 34/1000 Box Profile

3. 19/1000 Box Profile

4. Corrugated 3” Profile

5. Standing Seam (Architectural)

6. Composite Insulated Panels

Box profile is the most common for industrial and agricultural buildings.

2️⃣ 32/1000 Box Profile (Very Common)

The naming system in the UK:

32/1000 means:

• 32 mm rib height

• 1000 mm effective cover width

Typical features:

• 5 rib trapezoidal design

• 200 mm rib pitch

• Side lap with anti-capillary groove

Common thickness:

• 0.5 mm

• 0.7 mm

• 0.9 mm

Used for:

• ✔ Agricultural buildings
• ✔ Industrial sheds
• ✔ Warehouses
• ✔ Garages

3️⃣ 34/1000 Box Profile

Very similar to 32/1000.

Rib height:

34 mm instead of 32 mm.

Used where slightly improved water flow or strength required.

4️⃣ 19/1000 Box Profile

Lower rib height:

19 mm.

More common for:

• ✔ Wall cladding
• ✔ Light roofing
• ✔ Internal applications

Less structural capacity than 32 mm profile.

5️⃣ Corrugated Profile (UK Standard)

Traditional UK corrugated:

“3-inch corrugated”

Pitch approx:

76 mm (3")

Depth approx:

18 mm

Typical effective cover:

990–1000 mm (varies)

Common in:

• ✔ Agricultural buildings
• ✔ Heritage renovations
• ✔ Residential outbuildings

6️⃣ Standing Seam in the UK

Used primarily for:

• ✔ Architectural projects
• ✔ Residential extensions
• ✔ High-end commercial

Common seam heights:

• 25 mm

• 32 mm

• 38 mm

Panel widths:

• 400 mm

• 500 mm

• 600 mm

Often aluminum or prepainted steel.

7️⃣ Composite Roof Panels (Very Popular in UK)

UK market heavily uses:

Factory-made insulated sandwich panels.

Characteristics:

• Steel outer sheets

• PIR or mineral wool core

• Integrated trapezoidal profile

These reduce on-site labor and improve U-values.

8️⃣ Typical UK Thickness Standards

Common thickness (BMT):

Thickness	Typical Use
0.5 mm	Light agricultural
0.7 mm	Industrial roofing
0.9 mm	Heavy duty / long span

UK does not commonly use US-style gauge references.

Always specify mm.

9️⃣ Steel Grade Standards in the UK

UK follows European standards:

EN 10346

Common grades:

• S250GD
• S320GD
• S350GD
• S450GD
• S550GD

S350GD widely used for box profile roofing.

🔟 Coating Standards in the UK

Most common coatings:

Z275 (galvanized)
AZ150 (Al-Zn / Galvalume equivalent)

Prepainted steel common for visible roofing.

Corrosion classification per:

BS EN ISO 12944

Environment categories C1–C5.

1️⃣1️⃣ Wind & Structural Considerations

UK buildings must comply with:

Eurocodes (EN 1991)

Wind loading can be significant in:

• Coastal areas
• Scotland
• High-exposure rural sites

Fastener spacing and profile thickness selected accordingly.

1️⃣2️⃣ Metric-Based Design

Unlike USA:

UK profiles are fully metric.

Common effective covers:

• 1000 mm
• 990 mm
• 1060 mm

Machine design must reflect metric standardization.

1️⃣3️⃣ Machine Implications for UK Market

Roll forming machines targeting UK should support:

• ✔ 1000 mm effective cover profiles
• ✔ 0.5–0.9 mm thickness range
• ✔ S350GD forming
• ✔ Z275 and AZ150 coatings
• ✔ Anti-capillary side lap detail

Developed width for 1000 mm cover box profile often:

~1200–1250 mm coil width.

1️⃣4️⃣ Agricultural Market Influence

Large part of UK metal roofing demand comes from:

• Farms

• Livestock buildings

• Storage sheds

Durability and cost balance important.

Box profile dominates this segment.

1️⃣5️⃣ Common Mistakes When Exporting to the UK

• ❌ Supplying US 36” cover panels
• ❌ Using gauge instead of mm
• ❌ Not matching S350GD standard
• ❌ Ignoring Z275 minimum requirement
• ❌ Not providing CE marking documentation

UK market requires compliance documentation.

1️⃣6️⃣ Regulatory & Compliance Notes

UK requires:

• ✔ CE / UKCA marking
• ✔ Declaration of Performance (DoP)
• ✔ EN 1090 compliance (structural applications)

Material documentation must align with EN standards.

1️⃣7️⃣ Engineering Summary

Most common UK roofing profiles:

• ✔ 32/1000 box profile
• ✔ 34/1000 box profile
• ✔ 19/1000 wall cladding
• ✔ Corrugated 3"
• ✔ Standing seam 400–600 mm pan

Typical material:

• ✔ 0.5–0.9 mm
• ✔ S350GD
• ✔ Z275 or AZ150

UK market is:

• Metric-based
• Eurocode-driven
• Box profile dominant

FAQ Section

What is the most common roofing profile in the UK?

32/1000 box profile.

Is 1000 mm cover standard in the UK?

Yes, very common for trapezoidal roofing.

What grade is typically used?

S350GD under EN 10346.

What coating is common?

Z275 galvanized or AZ150 Al-Zn.

Are UK profiles the same as US PBR?

No. Geometry and dimensions differ significantly.

Does UK use gauge?

No, thickness is specified in millimeters.