76/18 Corrugated Panel Dimensions, Rib Spacing, Gauge Range, and Span Tables
76/18 Corrugated Panel Dimensions, Rib Spacing and Span Tables
76/18 Corrugated panels are a widely used metal roofing and wall cladding profile found in construction markets across Europe, Africa, Asia, and the Middle East. The profile features a sinusoidal corrugated wave pattern that provides structural strength, efficient water drainage, and economical manufacturing.
The designation 76/18 refers to the geometry of the corrugation:
• 76 mm rib pitch (distance between wave peaks)
• 18 mm rib height
This geometry creates a strong yet lightweight roofing panel suitable for a wide range of applications including industrial buildings, agricultural structures, warehouses, and residential roofing.
76/18 corrugated sheets are commonly used for:
• agricultural buildings
• warehouses
• residential roofing
• wall cladding systems
• industrial buildings
• storage sheds
The panels are produced using roll forming machines that shape steel coil into a continuous sinusoidal corrugated pattern. Because roll forming is a continuous production process, panels can be manufactured in custom lengths to match roof dimensions and reduce installation waste.
This guide provides a detailed technical overview of 76/18 corrugated panel dimensions, rib spacing, steel gauges, coil width requirements, and engineering span tables used by contractors, engineers, manufacturers, and roll forming machine buyers.
What is a 76/18 Corrugated Panel
A 76/18 corrugated panel is a metal roofing sheet formed with repeating sinusoidal waves that increase the stiffness and strength of the sheet.
The curved wave pattern distributes loads across the panel and allows thinner steel sheets to achieve strong structural performance.
Key characteristics include:
• sinusoidal corrugation profile
• evenly spaced rib pattern
• lightweight panel design
• efficient water drainage
• cost-effective manufacturing
Corrugated roofing systems using the 76/18 profile are widely produced because they offer a simple and durable roofing solution.
Standard 76/18 Corrugated Panel Dimensions
76/18 corrugated panels are manufactured in several widths depending on the number of corrugations across the sheet.
Typical dimensions include:
Specification
Typical Measurement
Coverage Width
762 – 1000 mm
Overall Width
820 – 1080 mm
Rib Height
18 mm
Rib Pitch
76 mm
Number of Corrugations
10 – 14
Panel Length
Custom roll formed
Effective coverage width depends on the overlap between adjacent panels during installation.
Corrugation Rib Layout
The corrugation layout consists of smooth sinusoidal waves repeated across the panel width.
Typical characteristics include:
• smooth curved wave profile
• uniform rib spacing
• continuous corrugation pattern
Typical dimensions include:
Feature
Measurement
Corrugation height
18 mm
Corrugation pitch
76 mm
Corrugation spacing
76 mm center to center
The sinusoidal wave pattern distributes loads evenly across the panel surface.
76/18 Corrugated Panel Cross Section Dimensions
The cross section of the panel is formed through a series of roll forming stations that gradually shape the metal sheet.
Typical cross section characteristics include:
Corrugation height
18 mm
Corrugation pitch
76 mm
Panel overlap
1 corrugation
Panel coverage width
Typically 762 – 1000 mm
The side overlap ensures water cannot penetrate the joint between adjacent panels.
Steel Gauge Range for 76/18 Corrugated Panels
76/18 corrugated panels are commonly manufactured using light to medium steel gauges depending on the application.
Typical gauges include:
Gauge
Thickness
Typical Application
29 gauge
0.0142 in
Agricultural buildings
28 gauge
0.0157 in
Residential roofing
26 gauge
0.0179 in
Commercial roofing
24 gauge
0.0239 in
Industrial buildings
Thicker gauges provide improved structural performance and longer span capability.
76/18 Corrugated Panel Span Tables
Span tables determine how far the panel can span between structural supports.
Span capability depends on:
• steel thickness
• corrugation depth
• panel width
• wind loads
• snow loads
Typical span ranges include:
Gauge
Roof Span
29 gauge
2 – 3 ft
26 gauge
3 – 4 ft
24 gauge
4 – 5 ft
Actual spans must be verified by engineering calculations based on building design requirements.
Coil Width Requirements for 76/18 Corrugated Panels
Steel coil must be slit to the correct width before entering the roll forming machine.
Typical coil widths include:
Panel Coverage
Coil Width
762 mm panel
820 – 840 mm coil
914 mm panel
980 – 1000 mm coil
1000 mm panel
1060 – 1080 mm coil
Additional material is required to account for the corrugation forming process.
Correct coil width ensures accurate panel coverage after roll forming.
Materials Used for 76/18 Corrugated Panels
76/18 corrugated panels can be manufactured using several metal materials depending on environmental conditions and building requirements.
Common materials include:
Galvanized steel
Galvalume steel
Aluminum
Painted steel
Galvalume steel is widely used due to its corrosion resistance and long service life.
Industries Using 76/18 Corrugated Panels
76/18 corrugated panels are widely used across many industries because of their durability and cost efficiency.
Common applications include:
Agricultural buildings
Industrial buildings
Warehouses
Residential roofing
Farm sheds
Storage facilities
These panels are particularly common in developing construction markets.
Roll Forming Machines Used to Produce 76/18 Corrugated Panels
76/18 corrugated panels are produced using roll forming machines designed specifically for corrugated roofing profiles.
Typical machine specifications include:
Number of forming stations
16 – 22 stations
Roller material
Hardened tool steel
Machine speed
20 – 40 meters per minute
Drive system
Chain drive or gearbox drive
Cutting system
Hydraulic shear or flying shear
Control system
PLC automatic length control
Corrugated roll forming machines are among the most widely used roofing panel machines in the world.
Installation Considerations
Proper installation ensures the long-term performance of corrugated roofing systems.
Important installation factors include:
Correct panel overlap
Proper fastener spacing
Roof slope requirements
Sealing of panel joints
Panels are typically overlapped by one corrugation to prevent water penetration.
Engineering Load Considerations
When designing corrugated roofing systems, engineers must consider structural factors including:
Wind uplift loads
Snow loads
Roof slope requirements
Thermal expansion
Corrugated sheets are commonly installed over purlins or structural supports.
Common Manufacturing Problems
Manufacturing problems may occur if roll forming machines are not properly adjusted.
Common problems include:
Uneven corrugation spacing
Panel waviness
Incorrect corrugation height
Edge distortion
These issues can usually be corrected by adjusting roll tooling alignment and forming pressure.
Frequently Asked Questions
What does 76/18 corrugated mean?
The designation refers to 76 mm corrugation pitch and 18 mm rib height.
What gauges are used for 76/18 corrugated panels?
Common gauges include 29, 28, 26, and 24 gauge steel.
What is the coverage width of 76/18 corrugated sheets?
Coverage width typically ranges between 762 mm and 1000 mm depending on the manufacturer.
Where are 76/18 corrugated panels used?
They are widely used for agricultural buildings, warehouses, residential roofing, and industrial structures.
Are 76/18 corrugated panels strong?
Yes. The sinusoidal corrugation pattern provides excellent strength while maintaining lightweight construction.
Conclusion
76/18 corrugated panels are one of the most widely manufactured metal roofing and cladding profiles used worldwide. Their sinusoidal wave design provides excellent structural strength, efficient water drainage, and economical manufacturing.
Understanding 76/18 corrugated panel dimensions, rib spacing, steel gauges, coil width requirements, and span capabilities is essential for engineers, contractors, and manufacturers working with metal roofing systems.
Roll forming machines designed for 76/18 corrugated panel production allow manufacturers to produce durable roofing sheets efficiently while maintaining consistent profile accuracy.