Grand Rib 3 Panel Dimensions, Rib Spacing, Gauge Range, and Span Tables
Grand Rib 3 Panel Dimensions, Rib Spacing and Span Tables
Grand Rib 3 panels are one of the most widely used metal roofing and wall cladding profiles for residential, agricultural, and light commercial buildings. The profile is known for its durability, simple rib design, and economical installation.
Grand Rib 3 panels are commonly installed on barns, garages, workshops, equipment storage buildings, warehouses, and residential roofing systems. The ribbed design increases the structural strength of the panel while allowing efficient drainage of rainwater.
The panels are manufactured using roll forming machines that gradually shape steel coil into the final ribbed metal panel. Because the roll forming process is continuous, panels can be produced in custom lengths to match building dimensions.
Grand Rib 3 panels remain one of the most widely used exposed-fastener roofing profiles because they combine cost efficiency, structural strength, and fast installation.
This guide provides a detailed technical overview of Grand Rib 3 panel dimensions, rib spacing, steel gauges, coil width requirements, and engineering span tables used by manufacturers, contractors, engineers, and roll forming machine buyers.
What is a Grand Rib 3 Panel
A Grand Rib 3 panel is a ribbed metal roofing profile designed primarily for exposed-fastener roofing systems. The panel features raised ribs that run along the length of the sheet, providing structural reinforcement and helping water drain efficiently from the roof surface.
Grand Rib 3 panels are commonly used for:
• residential metal roofing
• agricultural buildings
• barns and storage buildings
• garages and workshops
• light industrial buildings
• warehouses
The profile is installed using exposed fasteners that secure the panel directly to structural supports such as wood framing or steel purlins.
Because of its simple rib structure and efficient manufacturing process, Grand Rib 3 panels are widely produced and installed throughout North America.
Standard Grand Rib 3 Panel Dimensions
Although dimensions can vary slightly between manufacturers, Grand Rib 3 panels generally follow a standardized industry design.
Typical Grand Rib 3 panel dimensions are shown below.
Specification
Typical Measurement
Panel Coverage Width
36 inches (914 mm)
Overall Panel Width
Approximately 38 inches
Rib Height
0.75 inches
Rib Spacing
9 inches
Number of Major Ribs
4
Panel Length
Custom roll formed
The 36 inch coverage width allows roof systems to be installed efficiently while minimizing the number of panels required.
Panels can be manufactured in lengths ranging from 6 feet to over 40 feet, depending on building requirements.
Grand Rib 3 Panel Rib Layout and Spacing
The rib layout of Grand Rib 3 panels is designed to increase panel stiffness and improve resistance to structural loads.
Typical rib configuration includes:
• four major ribs
• minor stiffening ribs
• side lap overlap rib
Typical rib spacing configuration:
Rib Type
Measurement
Major Rib Spacing
9 inches
Rib Height
0.75 inches
Minor Rib Height
Approximately 0.2 inches
The ribs strengthen the panel and help prevent deformation caused by wind pressure or structural movement.
Minor ribs between the major ribs help reduce oil canning and improve panel rigidity.
Grand Rib 3 Panel Cross Section Dimensions
The cross section of Grand Rib 3 panels is designed to balance structural strength with efficient roll forming production.
Typical cross section dimensions include:
Major rib height
0.75 inches
Major rib width
Approximately 1.5 inches
Minor rib height
0.2 inches
Panel valley depth
Approximately 0.2 inches
Side lap configuration
Single rib overlap
The side lap rib allows adjacent panels to interlock securely during installation.
Sealant tape may be applied along the overlap seam to improve weather resistance.
Steel Gauge Range for Grand Rib 3 Panels
Grand Rib 3 panels are manufactured using a range of steel thicknesses depending on building requirements.
Common gauges include:
Gauge
Thickness
Typical Use
29 gauge
0.0142 in
Residential roofing
26 gauge
0.0179 in
Agricultural buildings
24 gauge
0.0239 in
Commercial buildings
22 gauge
0.0299 in
Industrial structures
The most common thickness used for Grand Rib 3 panels is 29 gauge steel, which provides an economical roofing solution.
Grand Rib 3 Panel Span Tables
Span tables indicate the maximum distance the panel can span between structural supports while maintaining structural performance.
Span capability depends on:
• steel thickness
• wind loads
• snow loads
• fastener spacing
• building design
Typical span ranges are shown below.
Gauge
Roof Span
Wall Span
29 gauge
2 – 3 ft
4 – 5 ft
26 gauge
3 – 4 ft
5 – 6 ft
24 gauge
4 – 5 ft
6 – 7 ft
22 gauge
5 – 6 ft
7 – 8 ft
Actual span limits must always be verified according to structural engineering calculations and local building codes.
Coil Width Requirements for Grand Rib 3 Panels
Steel coil must be slit to the correct width before entering the roll forming machine.
Typical coil widths used for Grand Rib 3 panels include:
Panel Coverage
Coil Width
36 inch coverage
44 – 46 inch coil
The additional material allows the roll forming machine to form ribs and side laps during the production process.
Incorrect coil width will result in incorrect panel coverage and dimensional errors.
Materials Used for Grand Rib 3 Panels
Grand Rib 3 panels can be manufactured using several metal materials depending on project requirements.
Common materials include:
Galvanized steel
Galvalume steel
Pre-painted steel
Aluminum
Galvalume coated steel is widely used because it offers improved corrosion resistance and longer service life.
Painted panels are often selected for residential buildings where appearance is important.
Industries Using Grand Rib 3 Panels
Grand Rib 3 panels are used across many industries due to their economical cost and reliable performance.
Common applications include:
Residential roofing
Agricultural buildings
Garages and workshops
Storage buildings
Warehouses
Light industrial facilities
Because of their durability and cost efficiency, Grand Rib 3 panels remain one of the most widely used metal roofing profiles worldwide.
Roll Forming Machines Used to Produce Grand Rib 3 Panels
Grand Rib 3 panels are produced using roll forming machines designed specifically for the profile.
Typical machine specifications include:
Number of forming stations
16 – 20 stations
Roller material
Hardened tool steel
Machine speed
20 – 35 meters per minute
Drive system
Chain drive or gearbox drive
Cutting system
Hydraulic shear
Control system
PLC controlled automatic length control
During production, steel coil passes through multiple forming stations where the profile is gradually shaped until the final panel geometry is achieved.
Installation Considerations
Correct installation is essential to ensure proper panel performance and weather resistance.
Important installation factors include:
Correct fastener spacing
Proper panel overlap
Use of sealant tape
Accurate panel alignment
Panels are typically fastened through the ribs directly into structural supports such as wood framing or steel purlins.
Engineering Load Considerations
When designing roofing systems using Grand Rib 3 panels, engineers must consider structural loads including:
Wind loads
Snow loads
Dead loads
Thermal expansion
Proper support spacing and steel thickness must be selected to ensure safe structural performance.
Engineering calculations must comply with local building codes.
Common Manufacturing Problems
Manufacturing issues can occur if the roll forming machine is not correctly set up.
Common problems include:
Panel waviness
Oil canning
Incorrect rib spacing
Panel twisting
Side lap misalignment
Most of these issues can be corrected by adjusting roll tooling alignment and machine setup.
Frequently Asked Questions
What is the coverage width of a Grand Rib 3 panel?
Most Grand Rib 3 panels have a 36 inch coverage width.
What is the rib height of a Grand Rib 3 panel?
Typical rib height is 0.75 inches.
What coil width is required to manufacture Grand Rib 3 panels?
Most manufacturers use 44 to 46 inch wide steel coil.
What gauges are commonly used for Grand Rib 3 panels?
Common steel gauges include 29, 26, 24, and 22 gauge steel.
Can Grand Rib 3 panels be used for both roof and wall applications?
Yes. Grand Rib 3 panels are commonly used for both roofing and wall cladding.
Conclusion
Grand Rib 3 panels remain one of the most widely used exposed-fastener metal roofing profiles for residential and agricultural construction. Their combination of durability, wide coverage, and economical manufacturing makes them a reliable roofing solution for many building types.
Understanding Grand Rib 3 panel dimensions, rib spacing, steel gauges, coil width requirements, and span capabilities is essential for manufacturers, contractors, and engineers working with metal roofing systems.
Roll forming machines designed for Grand Rib 3 panel production allow manufacturers to efficiently produce high volumes of panels while maintaining accurate dimensional tolerances required for modern construction projects.