The S-5 RibBracket III is a structural metal roof bracket designed for compatible exposed-fastened, trapezoidal-rib metal roof profiles. It provides an attachment point for rooftop accessories such as solar PV systems, HVAC equipment, roof walkways, and other compatible applications.
RibBracket III is part of the S-5! RibBracket family and is specifically designed for popular North American and Indian roof profiles, including PBR Panel, R-Panel, and Kirby Roof (KR) profiles with compatible dimensions. S-5! lists a compatible top-rib dimension range of approximately 1 inch to 1⅜ inches.
The bracket can also be paired with the S-5-PVKIT for rail-less solar installations. S-5! specifically identifies RibBracket III as an option when additional height is desired with the PVKIT system.
Key Takeaways
- S-5 RibBracket III is designed for compatible exposed-fastened trapezoidal-rib metal roofs.
- It is intended for roof profiles such as PBR Panel, R-Panel, Kirby Roof, and similarly dimensioned profiles.
- The compatible top-rib dimension range is approximately 1 inch to 1⅜ inches.
- RibBracket III can be used for applications including solar PV, HVAC equipment, and roof walkways.
- It can be paired with the S-5-PVKIT for rail-less solar mounting.
- The bracket attaches directly to the roof panel crown using compatible fasteners.
- A factory-applied EPDM gasket provides weatherproofing at the bracket.
- The bracket’s slotted top hole helps accommodate standard M8 hardware and provides installation adjustability.
- The roof profile, panel material, gauge, substrate, and applied loads must be evaluated before selecting the bracket.
- RibBracket III should not be assumed to work on every exposed-fastened metal roof.
What Is an Exposed-Fastened Metal Roof?
Before selecting RibBracket III, it is important to understand the type of roof it is designed for.
An exposed-fastened metal roof has visible screws or fasteners installed through the roof panels into the underlying deck or structural support.
These roofs are commonly manufactured in trapezoidal-rib and corrugated profiles.
Trapezoidal-rib panels include profiles commonly known as R-Panel, PBR Panel, and similar ribbed systems. S-5! distinguishes these profiles from corrugated roofing, which has a repeating wave-shaped pattern.
RibBracket III is intended specifically for compatible trapezoidal-rib profiles.
This distinction matters because metal roof brackets are not universal. A bracket designed for one roof profile may not have the correct geometry or tested load capacity for another.
What Is S-5 RibBracket III Designed For?
RibBracket III is designed to provide a structural attachment point on compatible exposed-fastened trapezoidal-rib roof profiles.
S-5! identifies applications including:
- Solar PV
- HVAC equipment
- Roof walkways
- Rooftop accessories
- Railed solar mounting
- Rail-less solar mounting with PVKIT
The bracket is particularly relevant when an accessory needs to be attached to an existing exposed-fastened metal roof without relying on a generic field-fabricated attachment method.
The specific application still needs to be evaluated based on the loads involved.
For example, the requirements for a lightweight electrical accessory are different from those for a large HVAC unit or solar array.
Key Features of S-5 RibBracket III
Designed for Specific Trapezoidal-Rib Profiles
RibBracket III is designed for popular North American and Indian trapezoidal-rib profiles.
S-5! specifically identifies PBR Panel, R-Panel, Kirby Roof (KR), and similarly dimensioned profiles as compatible applications.
The compatible top-rib dimension is approximately 1 inch to 1⅜ inches.
The roof should therefore be measured and identified before ordering.
Structural Aluminum Construction
The RibBracket family uses structural aluminum construction with corrosion-resistant stainless-steel hardware.
This combination is intended for exterior rooftop environments where the attachment is exposed to weather and temperature changes.
Factory-Applied EPDM Weather Seal
RibBracket uses a factory-applied EPDM gasket to weatherproof the connection.
S-5! states that its exposed-fastened brackets use integrated sealant reservoirs and factory-applied sealing systems rather than relying on field-applied sealants.
This helps make installation more consistent while reducing dependence on the installer’s selection and application of aftermarket sealants.
Slotted Top Hole
The bracket includes a slotted top hole designed to accommodate standard M8 nuts and bolts.
The slot allows some adjustment during installation, which can help simplify alignment when connecting rooftop accessories.
Direct Roof Attachment
RibBracket III is mounted directly onto the roof profile.
S-5! describes its RibBracket products as sheeting-only attachments that can be mounted along the rib where appropriate.
This allows the bracket to serve as a direct interface between the rooftop accessory and the metal roof panel.
RibBracket III for Solar Panel Installation
One of the major applications for RibBracket III is solar PV mounting.
The bracket can be paired with the S-5-PVKIT to create a rail-less solar attachment system.
Instead of installing conventional rails beneath the solar modules, the PVKIT attaches the modules directly to compatible roof attachment hardware.
S-5! specifically notes that RibBracket III can be used when additional height is desired with the S-5-PVKIT.
This can be useful for certain exposed-fastened roof configurations where the additional clearance provided by RibBracket III is desirable.
However, solar installations involve significant wind and structural loads. The roof panel, fasteners, brackets, solar modules, and supporting structure must all be evaluated as one system.
RibBracket III for HVAC Equipment
Metal buildings frequently have HVAC equipment mounted on or near the roof.
The attachment system must transfer equipment loads safely into the roof and supporting structure.
S-5! lists HVAC mounting as one of the applications for its RibBracket family.
However, HVAC equipment can impose considerably higher loads than lightweight rooftop accessories.
In addition to the static weight of the equipment, the design may need to account for:
- Wind uplift
- Equipment vibration
- Dynamic loads
- Maintenance loads
- Thermal movement
- Snow loads
- Equipment dimensions
- Roof panel capacity
- Structural framing capacity
The appropriate attachment configuration should therefore be determined from the equipment requirements and the roof’s structural characteristics.
RibBracket III for Roof Walkways
Roof-mounted walkways may be required to provide safe access to HVAC equipment, mechanical systems, solar arrays, or other rooftop components.
S-5! identifies roof walkways as an application for its exposed-fastened metal roof brackets.
A walkway system creates repeated loads from people, equipment, and maintenance activity.
The attachment points therefore need to be properly spaced and designed for the specific walkway system.
RibBracket III should only be used for walkway applications when the roof profile and the specific walkway system are compatible with the bracket’s tested capabilities.
How RibBracket III Attaches to the Roof
The RibBracket III is positioned directly on the compatible roof rib.
The bracket is then secured using the specified fasteners according to the manufacturer’s installation requirements.
S-5! describes its RibBracket products as being attached to the crown of the trapezoidal sheet using stainless-capped self-piercing screws. The product page also states that the sheeting-only attachment can be positioned along the rib.
The installation concept is:
Rooftop accessory → RibBracket III → roof panel → supporting roof structure
The complete load path must be considered when determining whether the bracket is suitable.
The bracket should not be treated as an independent structural component without considering the roof panel and supporting structure beneath it.
Weatherproofing and Roof Integrity
Any attachment installed on a metal roof must address water intrusion and corrosion.
Exposed-fastened roofs already have fasteners passing through the roof panel, which means the condition of the fastener and sealing system is important to long-term roof performance.
S-5! uses factory-applied EPDM sealing systems on its exposed-fastened brackets.
The company states that its bracket designs incorporate sealing reservoirs intended to protect the seal from UV exposure and prevent excessive compression.
S-5! also specifically advises against adding additional field-applied sealant around its brackets because exposed sealant can deteriorate over time.
Following the manufacturer’s installation procedure is therefore important.
How to Determine if RibBracket III Fits Your Roof
Selecting the correct bracket starts with identifying the roof profile.
For RibBracket III, important measurements include the width and geometry of the roof rib.
S-5! lists the compatible top-rib dimension range for RibBracket III as approximately 1 inch to 1⅜ inches.
You should also identify:
- Roof panel manufacturer
- Roof panel profile
- Panel thickness or gauge
- Rib dimensions
- Fastener type
- Fastener spacing
- Roof material
- Roof substrate
- Roof age
- Existing corrosion or damage
- Intended rooftop accessory
- Expected loads
A roof that visually resembles an R-Panel does not necessarily guarantee compatibility.
When the roof profile is uncertain, obtaining the original panel specifications or consulting with a qualified roof attachment professional can prevent an incorrect product selection.
RibBracket III vs. Other Metal Roof Brackets
S-5! manufactures several brackets for different exposed-fastened metal roof profiles.
RibBracket III is specifically designed for compatible trapezoidal-rib profiles.
Other brackets may be intended for different rib dimensions, corrugated panels, or different attachment locations.
| Factor | RibBracket III | Other S-5! Brackets |
|---|---|---|
| Roof type | Exposed-fastened trapezoidal rib | Depends on product |
| Typical profiles | PBR, R-Panel, KR and similar | Profile specific |
| Top-rib range | Approx. 1–1⅜ in. | Varies |
| Solar application | Yes | Depends on product |
| PVKIT compatibility | Yes | Depends on product |
| HVAC applications | Yes, when engineered | Depends on product |
| Attachment configuration | Profile specific | Profile specific |
| Load capacity | Application and roof dependent | Product dependent |
The correct bracket should always be selected according to the actual roof profile and the intended application.
RibBracket III for Butler Metal Buildings
RibBracket III may be relevant for Butler metal buildings that use a compatible exposed-fastened trapezoidal-rib roof profile.
However, Butler buildings use multiple roof systems, and the roof type can vary based on the building’s age, design, and construction.
Before ordering RibBracket III, confirm that the existing roof matches the product’s dimensional requirements.
If the building uses a standing seam roof, a standing-seam clamp rather than an exposed-fastened bracket would generally be the appropriate category of attachment.
If the building uses a corrugated roof, another S-5! bracket designed specifically for that profile may be more appropriate.
The roof profile should therefore be confirmed before selecting the attachment product.
Installation Considerations
Before installing RibBracket III, inspect the existing roof and verify the following:
- Roof profile
- Rib dimensions
- Panel gauge
- Roof material
- Fastener condition
- Roof panel condition
- Supporting structure
- Intended accessory
- Accessory weight
- Wind loads
- Snow loads
- Required attachment spacing
S-5! states that all pre-punched holes in the RibBracket must be used to achieve its tested strength.
This is an important installation requirement.
The bracket should not be partially fastened simply because fewer fasteners appear sufficient for the application.
The manufacturer’s installation instructions and applicable load tables should be followed for the specific roof configuration.
Things to Know
- RibBracket III is not a universal roof bracket. Verify the roof profile before ordering.
- Measure the rib. S-5! lists a compatible top-rib dimension range of approximately 1 to 1⅜ inches.
- PBR and R-Panel profiles are common applications. Similar profiles still need to be dimensionally verified.
- Use all required fasteners. S-5! states that all pre-punched holes must be used to achieve tested strength.
- Do not add unnecessary field sealant. The bracket uses factory-applied sealing components.
- Check the roof condition. Damaged, corroded, or deteriorated panels may not be suitable for additional loads.
- Consider the complete load path. The bracket, roof panel, fasteners, and supporting structure all contribute to the attachment’s performance.
- Solar applications require engineering. Wind uplift and other loads can be substantial.
- HVAC equipment can create significant loads. Equipment weight, vibration, wind, and maintenance loads should be considered.
- Standing seam and corrugated roofs require different attachment solutions. Do not substitute brackets without verifying compatibility.
Frequently Asked Questions
Q: What is S-5 RibBracket III?
S-5 RibBracket III is a structural metal roof bracket designed for compatible exposed-fastened trapezoidal-rib metal roofs.
It can be used for applications including solar PV, HVAC equipment, and roof walkways when the roof profile and load requirements are compatible.
Q: What roof profiles does RibBracket III fit?
RibBracket III is designed for popular profiles including PBR Panel, R-Panel, Kirby Roof, and similarly dimensioned trapezoidal-rib profiles.
S-5! lists a compatible top-rib dimension range of approximately 1 inch to 1⅜ inches.
Q: Can RibBracket III be used for solar panels?
Yes. RibBracket III can be paired with the S-5-PVKIT for rail-less solar PV mounting.
S-5! specifically identifies RibBracket III when additional height is desired with the PVKIT system.
Q: Can RibBracket III be used for HVAC equipment?
Yes, HVAC mounting is one of the applications identified for the S-5! RibBracket family.
The specific installation must be evaluated for equipment weight, wind loads, roof capacity, and structural requirements.
Q: Does RibBracket III require additional sealant?
S-5! states that additional field-applied sealant should not be used around its brackets.
The product uses factory-applied sealing components designed for the attachment system.
Q: Can RibBracket III be installed anywhere along the roof rib?
S-5! states that its RibBracket sheeting-only attachment can be mounted along the rib, subject to the product’s installation and profile requirements.
The exact location should still account for the accessory load and roof construction.
Q: Can RibBracket III be used on a standing seam metal roof?
RibBracket III is designed for exposed-fastened trapezoidal-rib roofs, not standard standing seam attachment.
Standing seam roofs generally require a compatible S-5! clamp designed to engage the specific seam profile.
Q: Can RibBracket III be used on corrugated metal roofing?
RibBracket III is designed for trapezoidal-rib profiles rather than generic corrugated roofing.
S-5! offers other brackets specifically designed for corrugated roof profiles.
Q: Does RibBracket III attach to the roof structure?
RibBracket III is a sheeting-only attachment that mounts directly to compatible trapezoidal roof panels.
The roof panel and its connection to the supporting structure must still be adequate for the applied loads.
Q: How many fasteners are required for RibBracket III?
S-5! states that all pre-punched holes must be used to achieve the bracket’s tested strength.
Always follow the manufacturer’s current installation instructions for the specific application.
The Bottom Line on S-5 RibBracket III
S-5 RibBracket III is a purpose-designed attachment bracket for compatible exposed-fastened trapezoidal-rib metal roofs. Its applications include solar PV, HVAC equipment, roof walkways, and other rooftop accessories when the roof profile and loading requirements are appropriate.
Its compatibility with profiles such as PBR Panel, R-Panel, and Kirby Roof makes it particularly relevant to common commercial and industrial metal building applications.
For solar installations, RibBracket III can also be paired with the S-5-PVKIT to create a rail-less attachment system.
The most important step before purchasing is verifying the actual roof profile and dimensions. The bracket’s tested performance depends on the specific roof construction and installation configuration.
For Butler metal buildings, confirm the existing roof system, rib dimensions, panel construction, and intended application before selecting RibBracket III.
Need help finding the right S-5 RibBracket III for your Butler metal building? Request a Quote and provide your roof profile, panel dimensions, and intended application.