Direct Answer
ANSI/SPRI/FM 4435/ES-1 is a wind-resistance testing standard for perimeter roof-edge metal systems used with low-slope roofing assemblies. It evaluates whether edge components, such as metal fascia, gravel stops, and coping systems, can resist the wind forces they are designed to withstand.
ES-1 does not apply to every roofing system or every roof component. Its applicability depends on the roof assembly, edge detail, adopted building code, project specifications, and local requirements. It is particularly relevant to low-slope commercial roofs using built-up roofing (BUR), modified bitumen, and single-ply membranes such as TPO, PVC, and EPDM.
For commercial property owners, developers, and general contractors in Florida, understanding ES-1 is important because failure of perimeter edge metal can allow wind to lift roofing materials, damage the roof assembly, and expose the building to water intrusion. Owners should confirm that the specified edge system has appropriate testing or documentation and is installed according to the approved design and applicable code.
For technical background, see the SPRI ES-1 FAQ and technical overview and the IIBEC guide to ES-1 specification and implementation.
Who This Applies To
- Commercial property owners and asset managers
- Commercial roofing contractors
- General contractors and construction managers
- Architects and roof consultants
- Developers building commercial properties
- Facility managers responsible for roof performance
- Condominium associations responsible for applicable common-area roofing systems
Not for: This guide is not a substitute for project-specific engineering, product approvals, building-code review, or manufacturer installation requirements. ES-1 applicability must be verified against the code edition and requirements governing the particular project.
1. What Does ES-1 Actually Test?
ES-1 addresses the wind resistance of roof-edge metal systems. It is not a test of the entire roofing membrane or a certification that every component of the roof assembly will withstand every possible storm.
The standard includes test methods addressing different roof-edge configurations:
- RE-1: Evaluates roof-edge termination details associated with certain ballasted or mechanically attached membrane systems.
- RE-2: Evaluates the pull-off resistance of edge flashings with a relatively narrow exposed horizontal component.
- RE-3: Evaluates the pull-off resistance of coping systems with a wider exposed horizontal component.
The applicable test method depends on the edge configuration and system design. Not every roof-edge product requires every test method in the same way; the applicable code and project requirements determine what is needed.
See the SPRI technical FAQ for additional information about ES-1 testing and product qualification.
2. Does ES-1 Apply to Every Roofing Material?
No. ES-1 focuses on the roof-edge assembly rather than the roofing membrane material itself. The membrane may be TPO, PVC, EPDM, modified bitumen, or built-up roofing, while the perimeter edge metal is evaluated separately where the applicable code requires it.
| Roofing System or Component | ES-1 Applicability | What to Verify |
|---|---|---|
| TPO membrane roof | Potentially applicable to required low-slope perimeter edge metal | Edge-system testing, design pressures, and installation details |
| PVC membrane roof | Potentially applicable to required low-slope perimeter edge metal | Compatible and appropriately tested edge assembly |
| EPDM membrane roof | Potentially applicable to required low-slope perimeter edge metal | Perimeter securement and applicable test requirements |
| Modified bitumen roof | Potentially applicable under the relevant low-slope roof provisions | Edge flashing and securement details |
| Built-up roofing (BUR) | Potentially applicable under the relevant low-slope roof provisions | Edge-metal design and attachment |
| Steep-slope asphalt shingle roof | Not generally governed by the low-slope ES-1 provisions | Applicable roof-covering and edge-detail requirements |
| Clay or concrete tile roof | Not generally governed by the low-slope ES-1 provisions | Applicable tile attachment, edge, and wind-resistance requirements |
| External gutters | Excluded from the ES-1 edge-system provision discussed here | Applicable gutter design and testing requirements, including GT-1 where required |
This table is a general guide, not a determination of code compliance for a specific building. A particular roof may have multiple assemblies, transitions, or edge details that require different compliance methods.
The National Roofing Contractors Association’s edge-metal testing guidance explains the distinction between ES-1 edge systems and GT-1 external gutters.
3. Why Is ES-1 Important for Florida Commercial Roofs?
Florida commercial buildings can experience substantial wind loads during hurricanes and severe thunderstorms. Roof-edge metal is particularly important because wind pressure and suction can place significant forces on perimeter details.
If a roof-edge system fails, possible consequences include:
- Metal fascia or coping becoming detached
- Loss of membrane edge securement
- Wind-driven water intrusion
- Damage extending beyond the original edge detail
- Interior damage and business interruption
- Expensive emergency repairs
ES-1 testing helps demonstrate that a specified edge assembly has been evaluated for resistance to relevant wind forces. However, a tested product does not automatically make the complete roof installation compliant. The substrate, fasteners, attachment spacing, design pressures, and installation must also be appropriate.
4. What Does the Florida Building Code Require?
The applicable Florida Building Code provisions must be checked for the specific project and permit. The 2023 Florida Building Code, Eighth Edition, included Section 1504.5 provisions addressing metal edge systems on low-slope built-up, modified-bitumen, and single-ply roofs with slopes below 2:12.
That provision referenced ANSI/SPRI ES-1 test methods RE-1, RE-2, and RE-3, or RAS 111, subject to the code’s conditions and applicable wind-speed determination. It excluded gutters and counterflashing from that particular provision. Separate provisions addressed gutters used to secure the roof membrane.
Because code editions and project-specific requirements matter, do not assume the 2023 provision is automatically the governing rule for every current project. Confirm the code edition applicable to the permit, the local jurisdiction’s requirements, and any applicable High-Velocity Hurricane Zone (HVHZ) provisions.
Reference: Florida Roofing and Sheet Metal Contractors Association overview of the 2023 Florida Building Code.
5. What Should Owners Request From Their Roofing Contractor?
When reviewing a new roof, replacement, or major restoration, owners should ask for documentation that identifies the proposed edge system and demonstrates that it meets the applicable project requirements.
Depending on the project, useful documentation may include:
- Manufacturer and product identification
- ES-1 test reports or applicable certification documentation
- Approved edge-metal shop drawings
- Specified design pressures and attachment requirements
- Substrate and nailer requirements
- Fastener type and spacing
- Approved installation details
- Documentation of any approved alternative design method
- Inspection and closeout records
Ask the contractor to identify the exact product and configuration being installed. Similar-looking edge-metal products are not automatically interchangeable, because fabrication methods, dimensions, materials, and attachment details can affect tested performance.
SPRI explains that the fabrication method can influence test results and that product testing must relate to the system as manufactured. See the SPRI FAQ.
6. Does an ES-1-Tested Product Guarantee the Entire Roof Will Resist Wind?
No. ES-1 addresses the tested roof-edge system; it does not certify the entire roofing assembly, building structure, or every roof component.
Overall wind performance also depends on factors such as:
- Roof-deck condition and attachment
- Roof membrane attachment method
- Insulation and cover-board attachment
- Perimeter and corner-zone design pressures
- Fasteners and supporting substrates
- Flashing and penetration details
- Quality of installation
- Compliance with the approved roof design
A product’s tested performance is meaningful only when the installed assembly matches the tested or approved configuration and is appropriate for the project’s design conditions.
7. What About Gutters and Counterflashing?
ES-1 should not be treated as the universal standard for every metal component at a roof perimeter.
Under the cited low-slope roof-edge code provision, gutters and counterflashing are excluded from that specific ES-1 requirement. Where an external gutter is used to secure the roof membrane, separate gutter design and testing provisions may apply, including ANSI/SPRI GT-1 where required by the governing code.
Owners should therefore ask the designer or roofing contractor to identify which standard applies to each component instead of assuming that an ES-1 label covers the entire perimeter assembly.
Technical reference: NRCA guidance on ES-1 edge systems and GT-1 gutters.
8. What Should Owners Do During Roof Replacement or Restoration?
Before approving the project, owners should verify that the edge details have been included in the scope rather than treated as an afterthought.
Recommended steps include:
- Confirm the applicable building code and project specifications.
- Identify the roof-edge conditions and required securement method.
- Review the proposed product’s test or certification documentation.
- Confirm that design pressures and attachment details are appropriate.
- Ensure the contractor follows approved installation instructions.
- Document concealed attachment details before they are covered when required.
- Collect shop drawings, product information, inspection records, and closeout documentation.
For existing roofs, a consultant or qualified roofing professional can review the edge details and identify deficiencies. Do not assume that an older installation complies with current requirements simply because it has not yet experienced a failure.
9. How Should ES-1 Be Considered During Roof Inspections?
A routine condition inspection and a code-compliance review are different activities. A visual inspection may identify loose fascia, displaced coping, failed fasteners, or deteriorated edge metal, but it may not establish whether the original installation met the applicable ES-1 requirements.
If there is concern about wind resistance, ask the roofing professional to document:
- Edge-metal type and configuration
- Visible attachment condition
- Evidence of movement, corrosion, or detachment
- Available product and installation documentation
- Any apparent mismatch with approved project details
- Whether additional review is needed to establish compliance
Where the documentation is missing or the installation differs from the approved details, the next step may be a more detailed evaluation—not an automatic conclusion that the roof fails ES-1.
Bottom Line
ES-1 does not apply to every type of roofing system. It is primarily concerned with wind-resistance testing of perimeter roof-edge metal systems used with low-slope roofing assemblies where the applicable code or project specification requires it. The roof membrane itself is not what ES-1 tests.
For commercial property owners in Florida, the practical priority is to confirm which requirements apply to the building, verify that the specified edge assembly has appropriate testing or documentation, and ensure the installed system matches the approved design. Gutters and other perimeter components may be subject to separate requirements.
Related Questions
- What Is a Pre-Installation Roofing Conference, and Why Does It Matter?
- What Does a Commercial Roof Observation Report Include?
- What Roofing Closeout Documents Should a GC Collect Before Turnover?
Sources
- SPRI — Low-Slope Roofing and ES-1 Testing FAQs
- IIBEC — Understanding ES-1: Proper Specification and Implementation
- NRCA — Testing of Shop-Fabricated Edge Metal
- Florida Roofing and Sheet Metal Contractors Association — 2023 Florida Building Code Overview
- SPRI — Technical Frequently Asked Questions
Last reviewed: October 2026
Related Resources
What Is a Commercial Roof Condition Report?
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Disclaimer: This information is provided for general educational purposes and is not engineering, legal, building-code, insurance, or design advice. Applicable requirements vary by jurisdiction, code edition, project conditions, and approved specifications. Consult the authority having jurisdiction and qualified design and roofing professionals for project-specific determinations.
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