When planning a commercial roof in Florida, property owners and building managers may encounter two different sets of requirements: the Florida Building Code (FBC) and FM requirements, generally associated with FM Approvals and FM Global property-loss-prevention standards. Although they can overlap, they are not the same thing. Understanding the difference is important when selecting a roofing system, preparing construction documents, and determining whether a roof will satisfy both code and insurance requirements.
Florida Building Code: The Legal Minimum
The Florida Building Code is the mandatory construction code governing building work throughout Florida, subject to applicable local requirements and amendments. The current code framework is the 8th Edition (2023) Florida Building Code, which became effective December 31, 2023.
For roofing, the FBC establishes requirements involving structural performance, wind resistance, materials, installation, fire performance, impact resistance, and other aspects of roof construction. Roof systems must be designed and installed according to the applicable code provisions and approved product or assembly requirements.
Florida’s roofing requirements can be particularly demanding because of the state’s exposure to hurricanes and high winds. The code incorporates wind-design provisions and recognizes testing standards such as FM 4474 and UL 1897 for certain wind-resistance evaluations.
In simple terms, FBC compliance is a legal requirement for applicable construction work.
FM Requirements: Property-Loss Protection
FM requirements serve a different purpose. FM Approvals is a third-party certification program focused on property-loss prevention. FM evaluates products and systems for characteristics such as fire performance, wind resistance, and other hazards. FM-approved roofing systems and products are listed through FM resources such as RoofNav and the Approval Guide.
FM requirements are often important for buildings that are insured under an FM Global policy or where an owner, insurer, lender, or project specification specifically requires FM-approved construction.
FM can be more prescriptive about the complete roof assembly. For example, FM guidance emphasizes using an FM Approved roof assembly with the appropriate wind and hail rating rather than simply combining individual FM Approved components. FM also provides procedures for determining roof uplift pressures and selecting appropriate securement for different roof zones.
Therefore, an FM requirement may address details such as:
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The exact roof assembly
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Membrane and insulation combinations
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Fastener type and spacing
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Adhesive application rates
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Roof deck construction
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Perimeter securement
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Corner and edge-zone reinforcement
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Wind-uplift ratings
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Fire and hail performance
FM’s plan-review information can require detailed documentation showing roof layers, material manufacturers, thicknesses, fastener or adhesive rates, flashing details, and existing deck information.
Does FM Approval Replace Florida Building Code Compliance?
No. FM approval does not replace compliance with the Florida Building Code.
A commercial roof may need to satisfy both requirements when an FM-insured property or project specification calls for FM-approved construction. The FBC establishes the applicable legal construction requirements, while FM requirements may impose additional property-loss-prevention criteria.
In some cases, a roofing product or assembly can be tested to standards recognized by the Florida Building Code while also having FM approval. However, contractors should not assume that an FM-approved product automatically means the entire roof installation complies with the FBC. The exact assembly, installation method, location, wind pressures, and product approval documentation must still be evaluated.
The Key Difference for Florida Commercial Roofs
The easiest way to understand the distinction is:
Florida Building Code = required building-code compliance.
FM requirements = additional property-loss-prevention requirements when applicable.
For example, a roof system could meet the Florida Building Code’s required wind-resistance criteria but still fail to satisfy an owner’s FM Global specification because the specified assembly, securement pattern, or FM rating is different. Conversely, selecting an FM Approved assembly does not eliminate the need to verify Florida-specific code requirements.
What Should Florida Property Owners Do?
Before replacing or restoring a commercial roof, determine which requirements apply to the property. Review the building’s location, wind design requirements, existing roof construction, Florida product approvals, project specifications, and insurance requirements.
For FM-insured properties, the contractor and design professional should verify the proposed assembly against the applicable FM Approval and RoofNav requirements rather than relying only on a product’s marketing claim.
For Florida commercial property owners, the safest approach is to treat FBC compliance and FM compliance as separate checks that may need to be satisfied together. A properly documented roofing system can help reduce approval problems, construction delays, insurance issues, and costly changes after installation.
Shieldline Roofing can help Florida commercial property owners evaluate roof assemblies, wind-uplift requirements, restoration options, and project-specific roofing requirements before work begins.
Related Questions
- What is FM Global and why do some Florida properties require FM-approved roofs?
- What is the difference between FM Global and ASCE 7?
- What is FM 4470 and what does it cover?
- How do FM requirements affect rooftop equipment anchorage?
- How does FM treat an existing roof during a recover?
- Who is qualified to certify that an installed roof meets FM requirements?
