Can you substitute a roof component in an FM RoofNav assembly?

When can you substitute a component in an FM RoofNav assembly?

Yes, you can substitute a roof component when the replacement is permitted in the selected RoofNav configuration or another listed assembly covers the complete proposed combination. FM Approvals certificate PR470159 ties Approval to RoofNav constructions, so a component's own Approval does not approve every assembly containing it. Save the full assembly identifier and selected components, then obtain the required design, insurance and warranty decisions before releasing the change for installation. A project-specific insurance acceptance covers its stated departure and does not create a RoofNav listing. [FM Approvals certificate PR470159](https://www.foamglas.com/-/media/project/foamglas/public/corporate/foamglascom/files/brochures/foamglas-soprema-fm-approval/fm-approval---pr470159coc251103.pdf) and [FM review 46261](https://www.gwinnettcounty.com/static/upload/bid/801486/BL063-25NOT20250522160058.pdf).

There are three routes through the review: select an option already permitted in the applicable configuration, select a different listed assembly, or document a project-specific departure. Record which route the proposal uses. Calling every route an approved substitution hides whether the assembled roof actually matches its listing.

FM Approvals granted certificate PR470159 on November 3, 2025. A product certificate identifies certified products and uses, an assembly listing describes a permitted combination, and a project review addresses a particular building. FM Approvals handles certification; FM provides insurance and loss-prevention engineering.

FM Approvals determines whether an alternative needs new physical testing through its examination program. Its [report PR472014, December 11, 2025](https://www.allshieldcoatings.com/assets/files/approval-report-pr472014-allshield-barriersheet-fm-4470-and-4478-approved.pdf) used previous testing and waived specified tests for the evaluated constructions. That determination belongs to the certifier, rather than the contractor comparing product data sheets.

This review covers membrane roof assembly changes. Start with [single-ply attachment and wind design](/field-guides/roofing/single-ply-attachment-methods-wind/) for the attachment-method decision; panel roofs and ballasted systems have their own design paths. The [roofing guide hub](/field-guides/roofing/) provides the broader installation references.

Assembly identity register: what exactly was specified?

Create one register for each roof area and construction type. Preserve the complete assembly number, selected layer options, export date, roof plan and submittal revision. An assembly number with several permitted options does not identify which products the crew must install.

Establish the actual deck, retained layers, attachment method, membrane family, slope and performance requirements before searching. Search RoofNav by the complete specified number or the actual construction, then read the assembly details, restrictions and referenced notes. Select the proposed products at each relevant layer.

[FM Approvals' May 8, 2024 RoofNav announcement](https://www.fmapprovals.com/resources/insights/new-roofnav) describes a Contractor Package that prints assemblies with saved layer components and configuration controls that disable incompatible options. Save that selected package, rather than a search-results screenshot.

Anvilfield recommends keeping local PDFs of both original and proposed packages, with retrieval dates, marked differences and the corresponding submittal revisions. Keep certification and project-review numbers in separate fields. Preserve the original register when issuing a revision so the reviewer can reconstruct exactly what changed.

The filled register below uses the [December 16, 2024 FM review published in Gwinnett County Addendum 1 on May 22, 2025](https://www.gwinnettcounty.com/static/upload/bid/801486/BL063-25NOT20250522160058.pdf). It records the submitted arrangement and the review's conditions. For a new project, retrieve a dated configuration and resolve the actual receiving substrate before ordering.

Substitution comparison: what changed from deck to membrane?

Compare the whole load path and fire build-up, including components described as unchanged. The proponent supplies the product comparison and scope; the system manufacturer identifies supporting assembly options and installation instructions; the design reviewer supplies the accepted zone layout. Each decision-maker then records a disposition within its own authority.

Identify every replacement by manufacturer, full product name, model and product-sheet revision. Record layer order, thickness, board dimensions, attachment and interfaces. A changed facer can change adhesive compatibility; added insulation can change fastener engagement and roof heights. Use the [insulation and cover-board guide](/field-guides/roofing/roof-insulation-cover-board-attachment/) and [deck identification guide](/field-guides/roofing/roof-deck-substrate-types/) to define those interfaces.

Include membrane formulation, reinforcement, thickness, backing, sheet width and seam layout. Changing from adhered to mechanically attached, induction welded or self-adhered construction changes the attachment system. A thicker membrane or narrower roll requires a matching configuration just as a different brand does.

The comparison below follows the load path in the [Wimberly Tower review](https://www.gwinnettcounty.com/static/upload/bid/801486/BL063-25NOT20250522160058.pdf). The public review identifies the listed application and submitted components; use the selected RoofNav package to complete the listing-side product fields. Keep any new proposal in a separate revision, with a column for its replacement products.

Finish with one clear disposition: matches selected listing, different listed assembly required, project-specific departure documented, or hold for missing evidence. Identify the affected roof area and assign each open item to the party supplying it. Release the accepted comparison with the order so purchasing and installation use the same revision.

Source: FM review 46261, December 16, 2024. Listing-side details describe that review; complete a new project comparison from its dated selected RoofNav package.

Can you substitute a RoofNav fastener or plate?

A fastener or plate substitution must be permitted in the identified assembly. NRCA's [June 2024 Professional Roofing guidance](https://www.professionalroofing.net/Articles/The-lightning-round--06-01-2024/5411) specifically warns that products absent from the applicable RoofNav assembly are unapproved substitutions. Equal gauge, a larger screw or a similar-looking plate does not establish permission.

Compare fastener and plate models, plate dimensions, deck engagement, corrosion protection, board interaction and membrane attachment method. Match private-label or renamed products through listing evidence. The distributor must supply the documented identity relationship, not an assurance that the products come from the same factory.

A withdrawal test measures the connection to the tested deck. Membrane pull-through, plate behavior, interlayer bond and fire performance need their own evidence. [FM DS 1-29, July 2022, §2.2.10.8.1](https://www.fm.com/FMAApi/data/ApprovalStandardsDownload?itemId=%7B4E7E947D-5F90-43C6-9693-D62CF02B4003%7D) uses the tighter spacing from assembly Approval or average pullout performance.

Keep the tested substrate, locations, fastener, embedment, apparatus, measured results, calculation and accepted attachment layout together. A favorable test at one location does not identify the materials or conditions elsewhere. Tie the test record to the roof areas whose installation details it supports.

More fasteners do not add an unlisted product to an assembly. FM DS 1-29, July 2022, §2.1 supplements listings with conditional zone enhancements; §2.2.10.11.1's proportional row-spacing method excludes adhered roofs. Within TDI's separate coastal evaluation program, [its May 20, 2026 requirements, §2.4](https://tdi.texas.gov/wind/documents/prodevalreqRC.pdf) prohibit analytical increases in evaluated pressure ratings by increasing fastener density or modifying attachment. Keep each procedure within its stated system and program.

Can insulation, cover board, adhesive or vapor control change?

Equal R-value does not establish equal assembly performance. Compare insulation brand, type, facer, permitted layer and total thicknesses, board dimensions, layer count and order against the selected listing. Check the project's separate thermal requirement as well. Equal compressive strength or the same generic ASTM product designation leaves the assembly match unresolved.

An adhesive alternative needs evidence for the actual receiving substrate and the selected board or membrane. Carry its application rate or ribbon pattern, storage requirements, ambient and substrate temperatures, surface dryness, mixing, equipment and cure or flash-off instructions into the work packet. Porous facers, humidity and the installation window can change which listed option is workable.

Include the replacement's installation instructions in the estimate and release packet. A crew cannot carry the previous adhesive pattern forward merely because the new material arrives in similar packaging. Substrate temperature, moisture, porosity and the available cure window must fit the accepted product's instructions on the installation day.

Cover boards can affect fire, hail, bond and attachment together. [Carlisle DA-2020-03, October 12, 2020](https://ccm-p-001.sitecorecontenthub.cloud/api/public/content/41cc642fb1504ee5b5009b6a77708adf?v=95bd38f7&download=true) reports an OSB-to-EcoStorm VSH change after testing. The bulletin leaves the affected assembly numbers and approval program unspecified, so obtain that evidence before assigning the change to a particular roof.

Adding or deleting vapor-control material changes the build-up. Record its location and attachment, then use the [roof vapor-retarder and air-barrier guide](/field-guides/roofing/roof-vapor-retarder-air-barrier/) to separate air-leakage control from vapor diffusion. A [vapor barrier](/field-guides/glossary/vapor-barrier/) is part of the construction being reviewed, not an invisible accessory.

[FOAMGLAS's undated assembly page](https://www.foamglas.com/en/foamglas-fm-approval) and [manufacturer FAQ](https://www.foamglas.com/-/media/project/foamglas/public/corporate/foamglascom/files/brochures/foamglas-soprema-fm-approval/fm-approval---faq.pdf) identify concrete-deck assembly 583529-419229-0 with Class A exterior fire at slopes up to 2/12, SH hail and 1-480 field wind uplift. Its depicted build-up includes concrete primer, an FM Approved vapor retarder, FOAMGLAS T4+ slabs fully bonded and top-coated in hot bitumen, Soprarock Global SBS 30 TF base ply and Sopralene Global C3 48 GF cap ply. Obtain the selected RoofNav configuration; the broader product list on the page does not establish every possible combination.

How do wind ratings and roof zones control the decision?

FM wind classifications express pressure performance in pounds per square foot (psf). In [FM Approvals' April 1, 2020 systems explanation](https://www.fmapprovals.com/resources/insights/systems-approach), 1-180 A SH means Class 1 interior fire, 180 psf wind performance, Class A exterior fire and severe hail. Read the fields independently: Wimberly Tower's review calls its wind rating 1-210 but records NC interior fire.

FM DS 1-29, July 2022, §3.1.6 uses an intended resistance-to-design-pressure safety factor of 2.0; its §2.2.10.11.1 worked design rounds required ratings upward to a 15 psf increment. Keep design pressure, required assembly rating and supplied rating separate, with their pressure bases identified. Do not double an already established required FM rating. [Read the dated FM design guidance](https://www.fm.com/FMAApi/data/ApprovalStandardsDownload?itemId=%7B4E7E947D-5F90-43C6-9693-D62CF02B4003%7D).

The [December 2024 Wimberly Tower review](https://www.gwinnettcounty.com/static/upload/bid/801486/BL063-25NOT20250522160058.pdf) supplies required ratings for every zone, including Zone 1'. Anvilfield estimates each rating surplus by subtracting the required rating pressure from the proposed assembly's 210 psf rating. All four numerical comparisons pass; the review's retained-insulation condition still controls project release.

Map the zone boundaries and corresponding attachment details to the roof plan. Check edge systems separately through the [edge-metal and coping design guide](/field-guides/roofing/edge-metal-coping-wind-design/). A sufficient field rating does not supply an edge detail or excuse a missing corner attachment requirement.

Keep the design edition with the calculation. The April 2026 revision of [FM DS 1-28](https://www.fm.com/FMAApi/data/ApprovalStandardsDownload?isGated=false&itemId=%7B76D1E43A-0684-4A29-8FB8-FE68E0D5A3EE%7D) is a later edition than the historical case’s December 2024 review. A new job needs its own wind inputs, geometry and applicable design method, even when it proposes the same assembly number.

Inputs: FM review 46261, December 16, 2024. Anvilfield estimates compare rating levels; the differences are not service-load reserve capacities.

Which fire and hail evidence must survive the change?

ASTM E108-25 classifies roof-covering performance under exterior fire exposure and does not establish fire resistance to a fire originating inside the building. Its Class A, B and C designations address exterior exposure. Retain the applicable substrate, slope and installation limits with the classification. [ASTM E108-25 public scope](https://store.astm.org/e0108-25.html).

Record interior fire separately. The Wimberly Tower review reports NC interior fire and A exterior fire; neither should be rewritten as a one-hour rating. FM DS 1-29, July 2022, §2.1 gives structural concrete a noncombustible internal-fire designation because of its thermal barrier.

[FM Approvals' April 2020 systems explanation](https://www.fmapprovals.com/resources/insights/systems-approach) distinguishes moderate, severe and very severe hail as MH, SH and VSH. Preserve the actual required class and its configuration. Board compressive strength alone cannot establish the assembly hail classification, and SH does not mean VSH.

An examination report also identifies which optional characteristics were evaluated. Report PR472014 records its test scope explicitly, showing why FM 4470 by itself is an incomplete performance schedule. Read the listed construction and classified characteristics together.

Use the following wind/fire evidence checklist as Anvilfield’s review tool. Each checked item should point to a document, drawing or field record. Resolve missing approval evidence before installing the change; inspect each installed layer before covering it.

Wind/fire evidence checklist

• Retain exact assembly, selected components and retrieval date.
• Match application to the layers removed and retained.
• Confirm deck type, condition, thickness and securement.
• Identify wind method, edition and pressure basis.
• Map required ratings and attachment to every roof zone.
• File separate edge-metal and coping evidence.
• Retain exterior-fire deck, slope and installation limits.
• Record interior fire and any hourly construction separately.
• Match hail class to the selected build-up.
• Identify the exact change in product sheets, tests and letters.
• Separate listing evidence from warranty and project decisions.
• Resolve approval evidence before installing changed work.

Who approves a roof component substitution?

Approval is a set of scoped decisions. FM Approvals controls certification and listing; insurer engineering addresses project loss-prevention acceptance; design and contract review address specified work; the warranty issuer decides warranty eligibility. Record the decision, issuer, date, revision and conditions for each applicable scope.

FM Approved construction can be specified on a building that is not FM insured. Determine the required evidence from the project specification, owner and insurer requirements, and applicable code or product-evaluation route. [FOAMGLAS's specifying guidance](https://www.foamglas.com/en/advice-center/general-advice/how-to-specify-fm-approved-roof-systems) explains system selection; the contract determines what this building requires.

For its designated Texas coastal catastrophe-area program, TDI's May 20, 2026 roof-covering evaluation requirements demand comparative test reports for membrane-system component substitutions and do not accept RoofNav output alone as verification of that performance. [TDI §2.2](https://tdi.texas.gov/wind/documents/prodevalreqRC.pdf) also requires the comparison to the component used in the full-scale assembly test.

[UFGS 07 54 23, August 2025, §§1.8 and 1.9](https://www.wbdg.org/FFC/DOD/UFGS/07%2054%2023.pdf) distinguishes written membrane-manufacturer acceptance of insulation and accessories from Contracting Officer approval of deviations before installation. Those provisions govern where incorporated into the project contract. A manufacturer letter should identify the actual components, project and warranty conditions it accepts.

[Cornell's owner review process](https://www.risk.cornell.edu/insurance-main-page/fm-global-plan-review/) recommends RoofNav selection, calls for uplift ratings and says Form 2688 should be completed for each roof system and building. Owner procedures add specific submission obligations. File warranty decisions alongside the [material, workmanship and NDL warranty terms](/field-guides/roofing/roof-warranty-types-ndl-coverage/) they support.

What changes when existing insulation remains?

Retained insulation changes both the application review and the evidence needed below the new work. Write down exactly what is removed, retained and added. A project called reroofing can still require a recover assembly: that is the mismatch identified in the Wimberly Tower review.

Establish the condition and attachment of retained layers down to the deck. Bonding a new cover board securely to a weak existing layer leaves the load path unresolved. Record the existing product, facer and thickness where determinable, moisture findings, removal limits and adhesive receiving surface. Gwinnett County's May 22, 2025 addendum, response 4.2, directs removal of wet insulation and retention of the rest.

Use the [tear-off versus recover decision guide](/field-guides/roofing/roof-tear-off-reroof-recover-decision/) to define the scope and the [infrared moisture-survey guide](/field-guides/roofing/infrared-roof-moisture-survey-interpretation/) to map the supporting condition evidence. Tie removal areas and replacement details to the same roof plan used for the assembly register.

FM DS 1-29, July 2022, §§2.2.10.16.4.4 and 2.2.10.16.4.5 call for the applicable recover/reroof system; a Class 1 recover does not upgrade an existing Class 2 roof to Class 1. Keep the fire evidence with the retained-layer record.

Worked substitution review: assembly 397066-0-0

The decisive change at Wimberly Tower was the receiving layer: new cover board would be bonded to existing tapered polyiso over precast concrete. The submitted RoofNav configuration was identified as New Roof. [FM review 46261, December 16, 2024](https://www.gwinnettcounty.com/static/upload/bid/801486/BL063-25NOT20250522160058.pdf) addresses that mismatch in Comment 1.

The wind screen passes, while the listed application differs from the submitted receiving layer. The 30 psf surplus in the critical zone cannot resolve the bond, retained-layer condition or listing mismatch. Read the rating table and the project comment as separate decisions.

Read the executive summary together with Comment 1. The summary describes project-only acceptability; the comment makes the retained-insulation departure conditional on account-engineer agreement and directs selection and resubmittal of a different RoofNav assembly for alternatives. Carry that condition and the final project disposition into the installer packet.

Anvilfield estimates 630 roofing squares and 1,052 gallons of membrane-bonding adhesive for the published 63,000 ft² roof. Method: divide the area by 100 ft² per roofing square, then multiply by the review's 1.67 gal/square application rate, as shown below. Round the nominal quantity to whole gallons, then add the actual ordering allowances for waste and packaging.

The quantity belongs to JM Membrane Bonding Adhesive at the review's stated rate. An alternative with another coverage rate changes the takeoff as well as the approval comparison. Reprice the accepted configuration, including its product quantities, installation equipment and labor.

The release decision is to retain the documented project-only condition and obtain the final disposition covering this arrangement. Any further component alternative needs the different assembly and resubmittal directed by the review. Complete receiving and installation checks against the accepted revision before concealing the work.

Source inputs: FM review 46261. Quantities and rating difference are Anvilfield estimates; adhesive quantity excludes waste and packaging allowances.

Which manufacturer instructions disagree or have been superseded?

Resolve apparent disagreement by comparing scope and date. FOAMGLAS requires conformity with the approved build-up; [Carlisle's October 2020 bulletin](https://ccm-p-001.sitecorecontenthub.cloud/api/public/content/41cc642fb1504ee5b5009b6a77708adf?v=95bd38f7&download=true) reports CAV-GRIP III added as an approved alternative in particular RoofNav assemblies after additional approvals. Both routes require an identified permitted configuration.

Elevate's Winter 2023 bulletin ended routine supply-shortage substitutions, set February 28, 2023 as the request deadline, and required inspection requests for approved deviations by December 31, 2023. It retained an extraordinary-circumstances exception. The old shortage program therefore supplies no standing 2026 substitution permission. [Read the successor bulletin](https://www.elevatecommercialbp.com/us-en/bulletins/warranty-services-bulletin).

Keep the edition supporting certification separate from the edition governing project design. FM report PR472014 used FM 4470, April 2022, and FM 4478, March 2025. A notice of standards work does not replace the issued requirements identified in a certification or contract.

Give a conflicting document its proper scope: current listing, warranty eligibility, contract deviation or jurisdictional evaluation. Request a written answer identifying the project, products, assembly, decision and conditions. File each answer against the comparison revision it addresses.

How do you price and schedule the proposed change?

RoofNav access is complimentary under FM Approvals’ May 8, 2024 announcement. Price engineering, testing, redesign and warranty administration from the actual project scope. A permitted option, a different listed assembly and an unlisted combination create different review tasks, so assign dates to their deliverables rather than one standard turnaround.

Before purchase release, identify the selected assembly, revised details and required written decisions. An unlisted combination can require a certification examination and testing; obtain those commitments before promising an installation date. Where UFGS §1.9 governs, deviation approval precedes installation, but the guide specification promises no fixed review duration.

Price five items: material difference, revised attachment and labor quantities, testing, design/review, and schedule effects. The worked adhesive takeoff shows why container price alone is insufficient. Carry accepted coverage rates into purchasing, and identify the cost of changed equipment or installation conditions in the change proposal.

Anvilfield recommends rechecking the packet at the proposed substitution, revised submittal, purchase release, delivery and installation of each concealed layer. These checks catch revised scope, an unsupported order, mislabeled deliveries and field alterations while the affected work can still be identified.

Assembly-record reconstruction is a defined service for owners with incomplete files: retrieve the original package, map retained layers, identify current products and record decisions by roof area. Store the resulting evidence in the [roof asset-management file](/field-guides/roofing/roof-asset-management-capital-planning/). Roofing teams expanding assembly-record services use [PorchRocket Ground Control](/lists/commercial-roofs) to build commercial building lists by roof material, roof age band and building size.

Installer release record: what must match on the roof?

Release one accepted revision with roof areas, product identities and attachment diagrams. Replace superseded drawings in the crew’s working packet while retaining the audit history. The release record below carries the published design information forward and identifies the actual project records needed to finish it.

Compare delivery labels with accepted names, models and thicknesses. Photograph labels, plates, adhesive application, installed patterns and concealed layers, linking each image to area and date. A different product arriving under the same purchase-order description still needs its own comparison and disposition.

When a mismatch appears, stop installing the affected component, keep the material identifiable and record the installed extent. Hold concealment of work already in place until its disposition is resolved. Resume with the accepted corrective detail or revised packet and retain the evidence of what was installed.

Finish with [single-ply seam QA](/field-guides/roofing/single-ply-membrane-seam-qa/), the accepted edge details and warranty documentation. Listing conformity establishes the specified combination; receiving and installation records establish whether the work matched it. Give the owner the final assembly package, departures, product records and inspection results together.

Installer checklist

• Put the accepted revision and zone plan in the crew’s packet.
• File written dispositions for all required approval scopes before installing the change.
• Match delivered product names, models, thicknesses and markings.
• Confirm deck and retained-layer conditions match the accepted scope.
• Match fastener/plate combinations and spacing to the installation area.
• Match adhesive product, application and conditions to instructions.
• Complete and record required tests and corrective actions.
• Identify roof area and date on concealed-layer photographs.
• Give each field change its own comparison and disposition.
• Deliver final assembly and warranty records to the owner.

Review and update log: Anvilfield, November 5, 2026. Final editorial review verified the worked inputs and technical provisions, expanded the component comparison, separated wind-rating fields and clarified approval before installation; sources and editions are listed below.

How to cite this page: Anvilfield, Can you substitute a roof component in an FM RoofNav assembly?, 2026, https://anvilfield.com/field-guides/roofing/fm-roofnav-assembly-substitution-review/.

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Sources checked

• Gwinnett County, BL063-25 Addendum 1, May 22, 2025, containing FM review 46261 of December 16, 2024 Reopened with curl for the November 5, 2026 review. Verified review pp. 1-3, Comment 1, roof-zone table, area, adhesive inputs and Addendum response 4.2. Historical project review, not a live RoofNav export.
• FM Approvals, The new RoofNav is here!, May 8, 2024 Curl blocked by site protection; reopened through web retrieval. Verified May 8, 2024 date, Contractor Package, compatible options and complimentary access.
• FM DS 1-29, January 2016, interim revision July 2022 Curl blocked by site protection; reopened through web retrieval. Verified July 2022 edition and cited provisions on pullout, attachment methods, wind factors, interior fire and recover systems.
• FM DS 1-28, interim revision April 2026 Curl blocked and full web open exceeded size limit. Verified April 2026 interim-revision provenance in the issuing publisher's indexed revision history; used only for edition context.
• FOAMGLAS, Compact Roof with FM Approval, undated live manufacturer page Reopened with curl. Verified exact assembly ID, depicted layers, slope and separate manufacturer-published wind, fire and hail classifications.
• FM Approvals certificate PR470159, approval granted November 3, 2025, manufacturer-hosted Reopened with curl. Verified PR470159, November 3, 2025 approval date and RoofNav conformity condition.
• Carlisle DA-2020-03, October 12, 2020, Code Guide Update Reopened with curl. Verified October 12, 2020 bulletin, assembly-specific adhesive alternative and tested cover-board change; historical bulletin requires current listing evidence.
• FM Approvals report PR472014, December 11, 2025, AllShield-hosted Reopened with curl. Verified December 11, 2025 report, examination scope, previous testing and FM 4470 April 2022 / FM 4478 March 2025 editions.
• USACE/NAVFAC/AFCEC UFGS 07 54 23, August 2025, references aligned with October 2025 UMRL Reopened with curl. Verified August 2025 guide specification, October 2025 reference alignment and §§1.8-1.9 manufacturer acceptance and pre-installation deviation approval.
• ASTM E108-25, public scope/significance, updated January 29, 2025 Reopened with curl. Verified E108-25 public scope and significance, January 29, 2025 update, exterior exposure and exclusion of interior-origin fire-resistance determination.
• Elevate, Warranty Services Bulletin: Winter 2023 Reopened with curl. Verified Winter 2023 shortage-program closure, extraordinary-circumstances exception and February 28 / December 31, 2023 deadlines.
• Texas Department of Insurance, Submittal Requirements for Product Evaluation, Roof Coverings, May 20, 2026, 2024 IRC/IBC basis Reopened with curl. Verified May 20, 2026 revision, 2024 IRC/IBC basis, coastal-program scope and §§2.1, 2.2, 2.4 substitution and attachment limitations.
• Cornell Office of Risk Management and Insurance, FM Global Plan Review, undated live page Reopened with curl. Verified owner-specific RoofNav recommendation, Form 2688, uplift-rating and flashing submission expectations.
• FOAMGLAS, General questions about FM Approvals, undated PDF Reopened with curl. Verified assembly identifier and manufacturer-published classifications; ASTM governs the article's explanation of exterior-fire scope.
• FOAMGLAS, How to specify FM-approved roof systems to meet insurer requirements, undated Reopened with curl. Checked benchmark treatment of component versus assembly approval and its example assembly identifier.
• FM Approvals, Systems Approach Ensures Effectiveness, April 1, 2020 Curl blocked by site protection; reopened through web retrieval. Verified April 1, 2020 date, classification fields and MH/SH/VSH meanings.
• NRCA, Professional Roofing, The lightning round, June 1, 2024, Fastener ads section Reopened with curl. Verified June 1, 2024 article and its assembly-specific warning about fastener and plate substitutions.