What is FM 1-52 field uplift testing and when is it required?

Direct Answer

FM 1-52 field uplift testing is a procedure described in FM Global Property Loss Prevention Data Sheet 1-52 that evaluates whether an installed above-deck roofing assembly can resist specified wind-uplift pressures. It helps verify the performance of a completed roof system rather than relying solely on laboratory ratings or installation documents.

Under FM Global’s guidance, field uplift testing or qualifying visual construction observation (VCO) is generally recommended for new, recovered, and reroofed above-deck roof assemblies at locations that are both within a tropical cyclone-prone region and subject to design wind speeds of at least 100 mph (45 m/s), subject to specific exceptions.

FM 1-52 is not a universal requirement for every Florida roof. Whether it applies depends on the property’s insurance and loss-prevention requirements, project specifications, roof assembly, applicable guidance, and any stated exceptions. Confirm the requirements with the property owner, roofing consultant, and FM Global representative before work begins.

Who This Applies To

• Commercial property owners installing a new roof or replacing an existing roof.
• Facility managers overseeing commercial reroofing or roof recovery projects.
• Industrial buildings, warehouses, retail centers, and other properties exposed to significant wind loads.
• Property owners and project teams whose insurance or project specifications reference FM Global requirements.
• Roofing contractors, consultants, and inspectors responsible for documenting wind-uplift performance.

Not for: FM 1-52 field uplift testing is not applicable to every roof construction. The current data sheet excludes metal panel roofs, including standing-seam and through-fastened systems, ballasted roofs, and mechanically fastened roof covers with fasteners spaced more than 2 feet (0.6 m) apart in either direction. The prescribed test method and roof assembly must be checked before testing.

1. What Is FM 1-52 Field Uplift Testing?

Wind uplift occurs when wind creates pressure differences that can pull a roofing membrane, insulation, cover board, or other roof components away from the underlying structure. If the roof assembly or its connections cannot resist these forces, the result may include membrane separation, fastener failure, water intrusion, or partial roof blow-off.

FM 1-52 provides procedures for field testing new installations of above-deck roofing assemblies to determine whether adequate wind resistance has been achieved. It also provides an alternative approach using visual construction observation during installation.

Depending on the roof construction and applicable procedure, testing can involve applying controlled negative pressure to a defined test area and evaluating the assembly’s response. The test results are compared with the required pressure criteria and applicable acceptance limits.

The purpose is to verify installed performance and identify potential installation deficiencies before the roof is accepted. A satisfactory test does not eliminate the need for appropriate design, approved materials, proper fastening, quality installation, and ongoing maintenance.

2. When Is FM 1-52 Testing Required or Recommended?

FM Global Data Sheet 1-52 identifies circumstances in which field uplift testing or visual construction observation should be provided for new, recovered, or reroofed above-deck roof assemblies.

The general applicability criteria are:

• Location: The property is in a tropical cyclone-prone region as defined by the applicable FM Global guidance.
• Design wind speed: The design wind speed is at least 100 mph (45 m/s).
• Project type: The work involves a new, recovered, or reroofed above-deck roof assembly.
• Applicability: The roof assembly is within the scope of the data sheet and is not covered by an applicable exception.

When these conditions apply, FM 1-52 identifies two general paths:

1. Satisfactory completion of the prescribed field uplift testing procedures.
2. Qualifying visual construction observation (VCO) performed in accordance with the data sheet.

These requirements should be addressed before construction begins. If testing is selected, the applicable testing requirements should be included in the building contract and roofing contract or subcontract, as appropriate. Testing should be witnessed by the owner’s representative, and the results should be documented and forwarded to the relevant FM Global servicing office as specified by the data sheet.

Important: The 100 mph threshold is part of FM Global’s applicability guidance; it does not mean every Florida roof above that wind speed automatically requires a field test under every regulatory or insurance arrangement. Confirm the current property-specific requirements and exceptions.

3. Are There Exceptions to FM 1-52 Field Testing?

Yes. The current data sheet identifies an exception for certain new roof covers that are mechanically fastened directly to specified deck types, provided the roof-cover fastener spacing is verified to be adequate.

Deck Type	General Condition for the Exception
Steel deck	Minimum 22-gauge steel deck.
Wood deck	Eligible deck type when the applicable fastening conditions are met.
Cementitious panel roof deck	Eligible deck type when the applicable fastening conditions are met.
Structural concrete	Minimum ultimate compressive strength of 2,500 psi (17.4 MPa).
Lightweight insulating concrete (LWIC)	Roof-cover fasteners must fully penetrate the LWIC and fully engage a minimum 22-gauge steel form deck.

The exception is conditional; it is not a blanket exemption for every roof installed over one of these deck types. The specified roof-cover configuration and adequate fastener spacing must be verified. FM 1-52 identifies visual identification or nondestructive examination, such as metal detection, as possible ways to verify fastener spacing.

Roofing contractors should confirm the exact wording of the current data sheet and the property’s requirements before deciding that field testing can be omitted.

4. How Is an FM 1-52 Field Uplift Test Performed?

The exact procedure depends on the roof assembly and the testing method specified by the data sheet. The general process involves the following steps:

1. Review the roof assembly. Identify the deck, insulation, cover board, membrane, attachment method, and specified wind-uplift performance.
2. Confirm the test requirements. Determine the applicable test method, required pressures, test locations, number of tests, and acceptance criteria.
3. Select appropriate test locations. Locations are determined according to the data sheet and the roof’s field, perimeter, and corner zones, where applicable.
4. Apply the prescribed test pressure. The testing equipment applies controlled negative pressure to the designated area in accordance with the applicable procedure.
5. Observe and measure the response. The tester records pressure, deflection, visible changes, and other observations required by the procedure.
6. Evaluate the results. The results are assessed against the specified test pressures and acceptance criteria. A failed or suspect test may require additional investigation.
7. Document and restore the test area. Record the results and observations. If test cuts or other intrusive procedures are required, a roofing professional should repair the affected area and restore watertightness.

Testing must be conducted by qualified personnel using the applicable procedure. The required test pressures, sample counts, and acceptance criteria should not be guessed or applied uniformly to every roofing assembly.

5. What Happens If a Roof Fails the Test?

A failed or suspect result indicates that the tested area may not satisfy the applicable wind-uplift performance criteria. It does not automatically establish that every part of the roof has failed, but it warrants investigation and corrective action.

Depending on the findings, the project team may need to:

• Review the roof design, attachment specifications, and installation records.
• Inspect the suspect area and conduct roof test cuts when required by the procedure.
• Identify deficiencies in fasteners, adhesive application, insulation attachment, cover boards, or other components.
• Repair or replace deficient materials and restore the roof to a watertight condition.
• Conduct additional verification testing or inspections as directed by the applicable requirements.
• Document corrective work and submit the required records to the owner and relevant FM Global office.

The corrective action should address the actual deficiency rather than simply repeating the test without investigating the cause. The project team should obtain acceptance under the applicable specifications before treating the issue as resolved.

6. Does FM 1-52 Apply to Existing Roofs After a Hurricane?

FM 1-52 can be used to assess the wind resistance of certain existing roofs. However, the data sheet specifically cautions that field testing should not be used to determine the cause of wind-uplift damage after a storm unless comparable field tests were conducted directly before the storm and it can be demonstrated that roof-cover damage or deficiencies did not exist before the event.

This distinction matters for Florida properties following hurricanes or severe wind events. A post-storm test alone cannot reliably establish whether a deficiency existed before the storm or whether the storm caused the damage.

For a damaged roof, arrange an appropriate professional inspection and document visible damage, photographs, maintenance records, and other relevant evidence. Consult the property insurer and qualified roofing or building-envelope professionals about the correct evaluation method.

7. Is FM 1-52 a Florida Building Code Requirement?

FM 1-52 is an FM Global Property Loss Prevention Data Sheet, not a blanket Florida Building Code mandate for every roof. It may become applicable through an insurer’s loss-prevention requirements, a project’s specifications, or contractual obligations.

Florida building-code requirements, local permitting requirements, insurance requirements, and FM Global recommendations are related but distinct. A roof may need to satisfy more than one set of requirements, and compliance with one does not automatically demonstrate compliance with all the others.

Before beginning a commercial roofing project, confirm:

• The wind-uplift performance required for the project.
• The applicable roof-system approval and attachment specifications.
• Whether FM 1-52 testing or visual construction observation is required.
• Whether the proposed assembly qualifies for a stated exception.
• Who will witness testing, review the results, and complete the required documentation.

Bottom Line

FM 1-52 field uplift testing helps verify the wind resistance of an installed commercial roofing assembly. Under FM Global guidance, field testing or qualifying visual construction observation is generally recommended for applicable new, recovered, and reroofed above-deck assemblies in tropical cyclone-prone regions where design wind speeds are at least 100 mph, subject to specific exceptions.

For a Florida commercial property, determine the requirements before work starts, verify the roof assembly and fastener configuration, include testing and documentation obligations in the contract when applicable, and resolve any failed or suspect results before acceptance.

Related Questions

• What’s the Difference Between Static and Cyclic Wind Uplift Testing?
• What Happens If I Install a Commercial Roof Without Proper Product Approval?
• When Is It Better to Replace a Commercial Roof Rather Than Repair It?

Sources

• FM Global Property Loss Prevention Data Sheet 1-52: Field Verification of Roof Wind Uplift Resistance, October 2024 interim revision
• FM Global
• IIBEC: Factory Mutual Revises Scope of FM 1-52

Last reviewed: October 2026

Related Resources

Planning a commercial roof replacement? Review our commercial roof replacement and re-roofing services to learn more about the considerations involved in planning a replacement project.

Need Commercial Roofing Help?

Commercial roof projects require careful coordination between roof-system specifications, wind-uplift requirements, installation quality, testing, and documentation. Before approving a proposal, confirm the required roof assembly, attachment method, testing responsibilities, and acceptance criteria with the appropriate project professionals.

This guide provides general educational information about FM 1-52 and commercial roofing. It is not a site-specific engineering assessment, insurance determination, or confirmation that a particular roof meets applicable requirements. Consult the current FM Global data sheet, project specifications, and qualified professionals for decisions about an individual property.

Explore Commercial Roof Replacement Services