5 Best Fire-Rated Roof Access Hatches for Commercial Projects

A roof opening can involve several competing requirements. You may have a documented fire strategy that calls for compartmentation, an energy model that penalizes thermal bridges, and an Authority Having Jurisdiction (AHJ) who wants paperwork before sign-off. Choose the wrong hatch and you could face submittal rejections, site delays, or a curb detail that does not line up. This guide to the 5 Best Fire-Rated Roof Access Hatches for Commercial Projects is intended for architects, roofing consultants, and facilities managers specifying commercial roof hatches.

Our top pick is Surespan for commercial projects that need a made-to-specification fire-rated roof hatch tied to a documented fire strategy and thermal break performance. It stands out by offering fire resistance up to four hours, custom dimensions for nonstandard openings, and a thermal break as a standard design feature. Williams Brothers is an alternative for projects that value US distribution and support from staff trained in architectural requirements, although specific hurricane, impact, and fire-performance claims require separate verification. Gorter is an option for projects seeking a 120-minute EN-tested product with TÜV NORD certification, but its European test basis means AHJ confirmation is essential for US use.

Below is a ranked list of five providers evaluated against the same four criteria: documented fire resistance and test basis, thermal break provision, customization capability, and project type fit. No product in this guide carries automatic IBC or UL acceptance. Final US code acceptance must be confirmed with your AHJ on every project.

What to look for

Use these criteria as a pre-submittal checklist. Running every option through the four filters can prevent much of the coordination work and uncertainty that otherwise appears later in the project.

Documented fire resistance and test basis

A marketing claim is not enough. You need a stated rating, such as 60 minutes, 120 minutes, or up to a four-hour fire rating, together with a clear test and listing basis that can be included in your roof access hatch specification. Ask how the assembly was tested, which standard was used, whether the listing covers the complete hatch, including the curb and seal, and what documentation you can provide to your AHJ. A fire-rated hatch without that paper trail is likely to delay approval.

Thermal break performance

Many older hatches conduct heat directly through their metal components. This can affect energy compliance and contribute to condensation. A thermal break separates interior and exterior metal so that an insulated roof hatch performs as intended. If energy code compliance is a project priority, ask whether the break is standard or optional, where it is located in the cover and curb, and how it connects with the roofing and insulation build-up.

Customization and made-to-order capability

Standard personnel roof hatch sizes work for many projects, but they may not suit an existing curb, a restricted shaft, a large equipment opening, or a custom roof hatch requirement linked to ladder angle and clearances. Made-to-specification capability matters when the opening does not match a catalog size. Custom production usually means a longer lead time and project-specific pricing, so procurement should begin early.

Project type fit and code coordination

No single hatch is right for every building. Coastal projects may have separate wind and impact requirements that need documented verification. An industrial plant with metal buildings may need smoke vents and fall-protection roof hatch accessories within the same package, while a city-center office with a strict fire strategy may require documented compartmentation. Match the product to the building type, then coordinate OSHA roof access rules for ladders and safety, IBC roof hatch requirements for egress where applicable, and fall protection around the opening.

Note on US code acceptance: Every product in this guide requires AHJ review. This guide does not assert automatic UL or IBC acceptance for any item. Your AHJ decides what is acceptable based on the occupancy, fire strategy, and test documentation submitted for the project.

At a glance: the best fire-rated roof access hatches compared

For a quick overview, the table shows the five ranked providers and the applications associated with each one. More detail, including limitations and points requiring verification, follows in the full reviews.

The 5 best fire-rated roof access hatches for commercial projects

Based on the evaluation criteria above, the five providers below offer relevant options for specifiers coordinating roof access with a documented fire strategy in 2026. Each entry is assessed against the same four criteria. Product claims should be supported by current project documentation, and final selection must always be confirmed with the project AHJ. The list begins with our top recommendation.

#1. Surespan – best for made-to-specification fire-rated roof access

Surespan specializes in roof access solutions built to order rather than selected only from standard stock. Its core offer is a made-to-specification fire-rated roof hatch designed to coordinate fire performance, thermal performance, and nonstandard dimensions within one assembly. This approach can suit projects with a documented fire strategy that identifies required ratings, seals, and compartment lines.

The product offers fire resistance up to four hours on a documented test and listing basis, a thermal break as a standard design feature, and custom dimensions to suit existing curbs or restricted shafts. This coordinated approach can help when the architect, roofing consultant, and fire engineer all need to approve the same detail. AHJ review still needs to be planned for, as with any rated assembly, because US acceptance is not automatic and depends on the documentation submitted.

Key specs

• Fire resistance: up to four hours, with a documented test and listing basis provided for submittal
• Thermal performance: thermal break included as a standard design feature to support energy code goals
• Dimensions: made-to-specification for nonstandard openings, including personnel sizes and larger formats
• Application: commercial projects where fire strategy, thermal needs, and access must be coordinated
• Procurement involves a project-specific quotation and custom lead time, with AHJ confirmation required

Four-criteria scorecard

• Fire resistance and test basis: the widest stated range in this guide, at up to four hours, with documentation available for submittal. Confirm with your AHJ that the stated basis suits the occupancy and proposed code path.
• Thermal break: standard rather than an add-on. This is useful where the specification requires an insulated assembly without removing the break during later value engineering.
• Customization is strong. Made-to-specification sizing can suit retrofit curbs, thick roofing build-ups, and layouts governed by restricted clearances.
• Project type fit: particularly suitable when a documented strategy drives the specification, but potentially unnecessary where a simple standard hatch meets the project requirements.

Pros

• Widest stated rating range in this guide, at up to four hours
• Standard thermal break to support energy compliance
• Made-to-specification sizing for nonstandard openings
• Documented test and listing basis for AHJ submittals
• A single assembly that coordinates fire performance with thermal requirements

Cons

• Custom and made-to-order lead times are likely to exceed those of off-the-shelf alternatives, so early ordering is necessary
• Final US code acceptance must be confirmed with the AHJ and is not automatic
• Pricing is project-specific, with no published list price, so a direct quotation is required
• The product may be over-specified for simple low-rise projects without a documented fire-strategy requirement

Special notes: Do not assume UL or IBC acceptance. Submit the test and listing documents early, then obtain written AHJ feedback before finalizing the roof curb detail.

Who it is best for: Architects and consultants who need a custom roof hatch with the rating, thermal break, and dimensions documented together.

#2. Williams Brothers – best for U.S. distribution and architectural support

Williams Brothers is a US access door and roof hatch specialist with staff trained in architectural requirements. That experience can be relevant when matching an access product to a specification section or hardware schedule. The company supports national work from distribution centers in Virginia, New York, and California, with its corporate office in Front Royal, Virginia.

The verified information for this review supports Williams Brothers as an option where US distribution, architectural support, or a multi-site rollout matters. Three stocking points may help facilities teams coordinating supply across different regions. Expectations regarding technical performance should remain evidence-based, however. The available verified facts establish distribution, architectural training, and an access-door focus, but they do not confirm a specific fire rating, thermal break detail, custom program, hurricane rating, or impact rating.

Four-criteria snapshot

• Fire resistance and test basis: not confirmed in the verified facts. Do not assume a rating, and request current test documentation if fire performance is required.
• Thermal break: not confirmed in the verified facts. Request a section detail and supporting technical information where energy performance matters.
• Customization is not confirmed in the verified facts, so available sizes and options should be checked against the curb requirements.
• Project type fit: strongest where US distribution, architectural support, or consistent supply for a commercial portfolio is a priority; hurricane and impact suitability requires separate documentation.

Pros

• US-based business with three distribution centers covering Virginia, New York, and California
• Associates trained in architectural requirements for access applications
• National footprint that may suit multi-site commercial programs
• Established specialist in commercial access products

Cons

• Specific fire ratings and their test basis are not confirmed, so verification is necessary before specifying a rated condition
• Hurricane and impact ratings are not established by the verified facts and should not be assumed
• Thermal break provision is not confirmed, meaning energy claims require written technical support
• The verified information available for this guide contains limited product-specific technical detail

Special notes: Consider Williams Brothers when distribution and architectural support lead the decision. If rated, hurricane, or impact performance is required, obtain the relevant rating letter and test basis in writing and submit them to your AHJ.

Best for: Commercial projects and multi-site portfolios that value US stocking and architect-focused support, subject to project-specific performance verification.

#3. Milcor – best for domestic access-product and vent experience

Milcor is a US manufacturer of access products based in Grand Rapids, Michigan, with customer service available Monday to Friday from 8am to 7pm EST. The company is described as having experience in access products and heat and smoke vents. This remains a limited-detail entry because the verified facts are sparse, so project-specific product claims need direct supporting documentation.

The practical basis for considering Milcor is its domestic access-product experience, weekday support hours, and portfolio connection with heat and smoke vents. The verified evidence does not establish a particular insulated, energy-efficient, or fire-rated roof hatch, so those characteristics should not be inferred from the company’s broader product experience. Request current product literature before deciding whether a Milcor product suits a standard personnel access opening, thermal requirement, or rated condition.

Four-criteria snapshot

• Fire resistance and test basis: not confirmed in the verified facts. Do not specify a Milcor hatch as rated without product-specific documentation.
• Thermal break: no verified thermal break, insulation value, or energy-performance detail is established here. Request construction details for the proposed product.
• Customization is not confirmed in the verified facts, so standard and nonstandard size availability should be checked directly.
• Project type fit: commercial projects seeking a domestic access-product manufacturer and responsive weekday service, subject to verification of the chosen product.

Pros

• Established US manufacturer with access-product and vent experience
• US-based customer support with extended weekday hours
• Portfolio experience includes heat and smoke vents alongside access products, which may assist broader product coordination

Cons

• Specific hatch fire ratings and their test basis are not confirmed, so any rated use requires verification
• Insulated or energy-efficient hatch performance is not established by the verified evidence
• Customization capability is not confirmed, meaning nonstandard curbs require a direct check
• The available verified facts are limited, so submittal requirements should remain cautious

Special notes: This is a limited-detail entry by design. Request current cut sheets, construction details, insulation information, and any product-specific rating documents before listing Milcor for a rated or thermally driven condition.

Best for: Commercial projects considering a domestic access-product manufacturer with weekday support, provided the proposed hatch is verified against the project specification.

#4. R&S Manufacturing and Sales – best for metal-building roof hatches and integrated safety accessories

R&S Manufacturing and Sales serves the metal-building and industrial market with a broad catalog. Verified products include metal roof walkways; smoke vents in UL, non-UL, and cold-storage variants; equipment and personnel access hatches; ventilation components such as louvers, dampers, and fans; and roof safety accessories including fall protection, ladder safety posts, and safety rail systems. Industry tags include building materials, daylighting, distribution, and manufacturing.

This provider is worth considering when access and safety products need to be coordinated together. Commercial and industrial owners often procure the hatch from one vendor, the ladder post from another, and the safety rail from a third. R&S offers the opportunity to coordinate a commercial roof hatch with fall protection and vent requirements through fewer sources. Depending on the selected products and project arrangements, that may simplify roof curb layout, sequencing, and responsibility for fit issues.

Four-criteria snapshot

• Fire resistance and test basis: a specific hatch rating is not confirmed. The UL listing in the verified facts applies to smoke vents only, not access hatches, and must not be extended to a hatch.
• Thermal break: not confirmed. Request product-specific construction details where the energy model requires thermal performance.
• Customization: the metal-building focus indicates a range of applications, but formal custom capability is not confirmed and should be verified.
• Project type fit: relevant to metal buildings, warehouses, and industrial plants requiring access products, vents, and roof safety equipment.

Pros

• Offers UL-listed and non-UL smoke vents, giving the applicable vent listings a documented basis
• Provides fall protection, ladder posts, and safety rails alongside access hatches
• Includes a cold-storage smoke vent variant for specialist facilities
• Metal-building and ventilation portfolio can support industrial product coordination

Cons

• Hatch fire rating is not confirmed, so rated hatch use requires separate product documentation
• The UL evidence applies to smoke vents and does not establish a UL-listed access hatch
• Thermal break provision is not confirmed
• Industrial and metal-building emphasis may not suit every office, school, or healthcare specification

Special notes: Use precise specification language. UL may be referenced for smoke vents where the selected vent is listed, but the hatch should not be described as UL listed unless R&S supplies hatch-specific paperwork. Confirm AHJ expectations separately for the vent and access hatch.

Best for: Metal-building projects seeking hatches, smoke vents, and fall-protection accessories from one industrial source.

#5. Gorter – best for EN-tested 120-minute fire-rated roof access

Gorter offers the RHTEI model, which is described as providing 120 minutes of fire protection and a fire-rated seal for the space below when closed. It is presented as a practical means of access to flat roofs, suitable for roofs with a maximum slope of 5 degrees, and available in TÜV NORD-certified combinations. That third-party certification may help a fire engineer assess the product through independent documentation rather than relying only on a manufacturer statement.

The main limitation is the applicable regulatory framework. The test basis is European, centered on EN 1634-1-type fire testing and CE and ETA contexts, with TÜV NORD as the certifier. This does not establish automatic US code, UL, or IBC acceptance. AHJ confirmation is required before Gorter is specified for a US commercial project that depends on the stated rating. Its stated maximum of 120 minutes is also lower than the capability of up to four hours offered by the top-ranked option.

Four-criteria snapshot

• Fire resistance and test basis: 120-minute protection with TÜV NORD-certified combinations. It has a documented European framework, but US AHJ review remains essential.
• Thermal break: not detailed in the verified facts. Request a product section and supporting data if thermal performance affects selection.
• Customization is not confirmed in the verified facts, so available sizes should be checked against the curb, opening, and ladder arrangement.
• Project type fit: flat and near-flat roofs up to 5 degrees where a 120-minute EN-tested solution is identified in the specification and accepted by the AHJ.

Pros

• Stated 120-minute fire protection with a documented European test basis
• TÜV NORD certification provides an independent third-party reference
• Fire-rated seal in the closed position to support the specified compartmentation approach
• Suitable for flat and near-flat roofs with slopes up to 5 degrees

Cons

• The European test basis does not provide automatic US, UL, or IBC acceptance, making AHJ confirmation essential
• Customization capability is not confirmed, so made-to-order sizing should not be assumed
• US distribution and lead time are not confirmed, requiring early procurement checks
• The 120-minute stated maximum is lower than the option offering up to four hours at number one

Special notes: State the European test basis clearly in the specification and note that the US AHJ’s decision governs acceptance. Do not assert IBC or UL compliance. Submit the TÜV NORD documentation and request a written ruling before finalizing the curb detail.

Best for: Projects whose documents specifically call for EN-tested 120-minute access with TÜV NORD certification and where the AHJ has accepted that compliance path.

Frequently asked questions

Should I specify a rated hatch when my building has no documented fire strategy?

If no fire strategy identifies a rating at the roof, a rated assembly may not be necessary. A suitable roof hatch with an appropriate curb, flashing, and safety detail may meet the project requirements. Check with the AHJ and fire consultant because occupancy, separation lines, or a future tenant change could create a rating requirement.

Is a four-hour rating worth it for my commercial project?

A four-hour rating is worthwhile only when the documented fire strategy requires it. High-risk occupancies, compartment floors, or special separation conditions may justify extended fire resistance. For a simple low-rise office with no rated separation at the roof, a four-hour assembly is likely to be excessive and may add cost and lead time.

Should I choose a rated hatch over a standard insulated hatch for energy savings?

Energy performance alone should not determine whether you choose a rated hatch. A rated product can include a thermal break, but standard insulated hatches may also provide thermal separation. Compare thermal break details, insulation values, gasketing, and curb construction side by side. Select a product that meets the energy model, then require a fire rating only when the fire documents call for one.

Should I rely on OSHA rules alone to decide on roof access and safety?

OSHA roof access rules address ladders, clearances, and worker safety, but they do not resolve fire or energy requirements. Hatch size still needs to be coordinated with ladder angle, safety posts or rails may be required where falls are a risk, and the opening must remain clear. OSHA requirements are one layer of coordination, while fire and building codes remain separate considerations.

Should I expect my AHJ to accept a European test without extra review?

No. A European test basis is likely to prompt additional questions. Provide the full test report, certification, and assembly details showing how the product supports the proposed compartmentation. For products tested to an EN 1634-1 basis, identify the European framework clearly and request written acceptance. A TÜV NORD certificate does not equal automatic US, UL, or IBC approval.

Is a thermal break worth it in a rated assembly?

In most heated and cooled buildings, a thermal break is beneficial. It reduces conduction, can help limit condensation, and supports energy code compliance. Ask whether it is standard or optional, how it performs as part of the tested rated assembly, and how it connects to the roof insulation. Do not remove it through value engineering without first checking the effect on energy performance.

Is a custom size worth it given cost and lead time?

A custom size can be worthwhile when the curb already exists, the shaft is restricted, or the ladder arrangement requires exact clearances. It can avoid awkward infill pieces and site cutting that may affect ratings or warranties. If the opening matches a standard personnel size and the fire strategy does not require customization, a standard size may reduce both cost and lead time.

Our final take

The decision path begins with the documented fire strategy, followed by thermal requirements, dimensions, and project type. Where documented performance, a thermal break, and custom sizing need to be coordinated, start with Surespan and seek AHJ feedback early. Williams Brothers is worth considering where US distribution and architectural support are priorities, but hurricane, impact, and fire-performance claims require product-specific verification. For EN-tested 120-minute performance, Gorter may be appropriate only where the AHJ accepts its European test basis. Whichever product you select, secure the rating documents, curb detail, and written AHJ sign-off before ordering.