Metal wall cladding performs well only when the panel system, building geometry, fire strategy, windows, substrates, flashings and installers are coordinated as one envelope. The most useful advice from manufacturers is therefore procedural: involve the fabricator before drawings are fixed, document the tested fire assembly, resolve every opening and transition, and inspect concealed work before it disappears behind panels.
The eight tips below originate in a Building Design + Construction article published April 12, 2011, and are recast for current projects. The older examples are useful warnings, not universal code rules. Always use the selected manufacturer’s current technical literature, project-approved drawings and the requirements of the authority having jurisdiction.
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What the original eight tips do—and do not—establish
The 2011 article collected practical comments from representatives of Kingspan, 3A Composites USA and ATAS International. It did not compare product performance, set a universal installation method or establish code requirements for every location. A project team should treat the comments as design and quality-control prompts, then verify each item against the current product and jurisdiction.
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1. Bring the fabricator into design before the geometry is fixed
Panel systems have forming, spanning, joint and transportation limits. Paul Collyer, technical services director for Kingspan, put it simply in the 2011 article: “Every product has its limitations,” The article used insulated metal panels as an example that may not suit compound bends or cylindrical forms, while some composite panels can accommodate those profiles.
That example should trigger an early capability check, not a blanket preference for one system. Send the fabricator the intended radii, curves, module dimensions, reveals, corner conditions, support spacing and tolerances. Ask for written confirmation of the tightest permitted bend, maximum panel length, joint movement, available trims and whether curved pieces are factory-formed or field-adjusted. Confirm that the proposed finish, coil width and color are available for the required quantities and lead time.
Information to request at concept stage
- A geometry review marking planar, faceted, single-radius and compound-curved areas.
- Maximum and minimum panel dimensions, joint widths and permitted deviation at supports.
- Details for corners, parapets, soffits, penetrations and changes in plane.
- Substrate assumptions, attachment zones and any requirement for secondary framing.
- A list of shapes that require a different panel family rather than a field workaround.
2. Put fire requirements in the specification and bid documents
Tom Seitz, director of sales and marketing for 3A Composites USA, advised: “Make sure fire code compliance issues are listed in the specs,” This is a procurement control as much as a design instruction. If fire performance is left implicit, bidders may price assemblies with different cores, liners, joints or cavity arrangements.
Identify the adopted building and fire codes, occupancy, construction type, height and area limits, exterior-wall conditions, cavity barriers and required fire-resistance or reaction-to-fire classifications. Then name the documentation that must accompany the bid: a listing or test report for the complete assembly, field-of-application limits, approved component substitutions and installation restrictions. A panel’s core designation by itself does not prove that the wall meets the project requirement.
Require each fabricator to state the exact assembly tested or assessed, including sheathing, insulation, air or water-resistive barrier, framing, fasteners, joints and penetrations. Have the fire consultant or code official review deviations before procurement. Do not carry the 2011 article’s historical polyethylene-core example into another jurisdiction without a current code analysis.
3. Coordinate windows and adjacent materials as envelope interfaces
Openings are where panel joints, sill pans, membranes, flashings and window frames converge. Seitz warned, “You have to make sure that the window design is compatible with the panel system design,” and added, “Window frame openings have to be properly detailed and properly flashed.”
Draw the window, panel, air-control layer, insulation, sill pan, end dams, head flashing, jamb closures and sealant in one enlarged section. Show where water drains, where each membrane terminates and how fasteners avoid damaging concealed layers. Coordinate the window manufacturer’s installation sequence with the cladding sequence; a flashing that is easy to install before the panel may be inaccessible afterward.
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Use the same discipline at transitions to stucco, stone, brick, wood or another metal system. Establish movement joints, drainage paths, compatible sealants, dissimilar-metal separation and termination bars. Current installation guidance emphasizes interface drawings and inspection of concealed layers because a visually neat panel face can hide an incomplete transition.
4. Treat mixed cladding systems as a single coordination problem
Combining single-skin panels, metal composite material (MCM), aluminum plate and insulated metal panels can produce a useful facade, but each system brings different support, joint, movement, drainage and fire-documentation needs. Jim Bush, vice president of sales and marketing with ATAS International, said: “Designers must be aware of the product limitations and substrate requirements for each system as well as how to integrate other building characteristics such as windows into each cladding component,”
Divide the elevation into system zones and assign each zone a substrate, attachment method, cavity depth, air and water-control path, fire detail and installer. At every boundary, draw the actual transition rather than using a generic “typical” detail. Check that reveals align without forcing one system to absorb the movement or tolerances of another. Coordinate windows separately where they cross from one panel family to the next.
Mixed-system coordination checklist
- Identify the substrate and support spacing required by every panel family.
- Map horizontal and vertical joints, movement joints and drainage outlets.
- Confirm that fire and air-barrier documentation covers each interface.
- Detail trim, flashings and sealants at changes in thickness and plane.
- Assign one party to resolve conflicts between architectural, structural and envelope drawings.
5. Check orientation-specific details before ordering panels
Horizontal and vertical layouts do not necessarily use the same flashing, splice, drainage or fastening details. The 2011 article specifically warned that horizontal single-skin panels may need different flashing techniques from vertical panels.
Review the manufacturer’s detail set for the exact profile and orientation. Confirm lap direction, end laps, joint seals, weeps, base and head conditions, corner closures, thermal movement allowances and the order in which flashings are installed. Do not rotate a vertical detail and assume it remains watertight.
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A New Zealand example illustrates why jurisdiction matters: the version 26.09 code update issued in September 2026 includes window-flashing details for vertical and horizontal corrugated wall cladding. Those provisions belong to that code and its scope; they are not a global rule. In every location, use the locally adopted code and the selected product’s approved details.
6. Qualify installers and verify their relevant experience
The original article recommends manufacturer-trained and certified subcontractors. Collyer reported, “The problems we have are few and far between on projects with certified, trained subcontractors,” Treat that as a risk-control recommendation, then verify what it means for the product you are buying.
Ask whether the manufacturer currently offers training or certification, whether the credential applies to this panel family and whether it remains valid for the project period. Request references for comparable geometry, orientation, height and interface complexity. Review the installer’s plan for layout control, sealant preparation, fastener installation, protection of finishes and correction of damaged panels.
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7. Inspect alignment and concealed work at defined hold points
Poor support alignment can consume joint tolerance and force unplanned sealant. Seitz described the failure mode this way: “I’ve seen instances where steel alignment is so poor that the joint tolerances were affected and additional sealant had to be added,” The remedy is inspection before panels make the condition inaccessible.
Establish hold points before the barrier, flashings or closures are covered. Check structural lines, openings, girts, sub-framing, plane changes, fastener zones and tolerances against the approved shop drawings. Photograph and record each area, identify the responsible trade and close the item before release.
Minimum inspection sequence
- Verify the substrate and secondary framing are in the correct plane and within the manufacturer’s tolerance.
- Inspect air, water and vapor-control layers, laps, end dams, penetrations and transitions before concealment.
- Approve the first installed bay, including joints, corners, flashings, fasteners and sealants.
- Check panel alignment, reveal width, finish protection and damage as installation proceeds.
- Record repairs and reinspection; do not rely on extra sealant to disguise a framing defect.
Current installation guidance recommends these hold-point inspections because correcting a concealed omission may otherwise require panel removal, membrane replacement and substantial rework.
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ATAS’s Bush said in 2011, “Integrating photovoltaic cells into the wall panels is a growing trend,” and, “The cladding is also being used as a solar collector, as with transpired solar collectors.” These statements identify possible design directions, not proof of present adoption, energy yield or code acceptance.
If a project is considering photovoltaic cladding or a transpired solar collector, request current product data, structural attachment details, electrical and fire documentation, weatherproofing interfaces, maintenance access and a model-specific energy assessment. Confirm who owns the roof-and-wall warranty where electrical equipment penetrates or attaches to the cladding. Compare the option against the project’s orientation, shading, service clearances and planning constraints rather than treating it as an automatic sustainability upgrade.
How the main panel families differ for coordination
The NRCA Metal Wall Panel Systems Manual covers single-skin panels, metal composite material panels, aluminum plate panels and insulated metal panels, as well as rain control, wall substrates, assembly configurations, fasteners and sealants. The table is a coordination aid, not a performance ranking; the available sources do not establish common prices, warranties, lifecycle impacts or test results.
| System family | Geometry and layout question | Substrate and attachment question | Fire and interface question |
|---|---|---|---|
| Single-skin metal panels | Confirm profile, allowable curvature and whether horizontal installation changes flashing details. | Verify support spacing, fastener pattern, backup plane and movement allowance in current instructions. | Document the complete tested wall and detail window, base, head and material transitions. |
| Metal composite material panels | The 2011 article identified composite panels as a possible solution for some compound or cylindrical profiles; confirm the current product’s forming limits. | Confirm rout-and-return or other fabrication method, sub-framing, attachment and joint tolerances. | Use the exact core, joint and cavity configuration covered by current fire documentation. |
| Aluminum plate panels | Check available sizes, formed corners, oil-canning tolerances and orientation-specific details with the fabricator. | Verify clips, extrusions, sub-framing and allowance for thermal movement. | Coordinate the plate system with barriers, flashings, windows and adjacent claddings. |
| Insulated metal panels | Confirm whether the profile can achieve the required curves; compound bends and cylindrical forms may be unsuitable for some products. | Verify panel span, joints, support alignment, end conditions and penetrations in the current manual. | Obtain assembly-specific fire evidence, including cores, liners, joints and penetrations. |
Common failure modes and the corrective action
| Observed problem | Likely coordination gap | Corrective action |
|---|---|---|
| Panels do not meet a curve or corner cleanly. | Geometry was selected before the fabricator reviewed forming limits. | Stop field modification; obtain a revised panel scheme or approved fabricated component. |
| Window sill leaks after cladding is complete. | Sill pan, end dams or panel flashing were drawn as separate scopes. | Expose the interface as needed, correct the drainage path and update the enlarged detail before repeating the work. |
| Joint widths vary along a steel line. | Substrate alignment was not checked at a hold point. | Survey and correct framing, then reinstall panels to the manufacturer’s tolerance. |
| A bidder proposes a different core or liner. | Fire requirements were described generally rather than by tested assembly. | Require equivalent current documentation and code-official acceptance before substitution. |
| Horizontal panels have trapped water at laps. | A vertical detail was reused without orientation review. | Use the product’s horizontal detail, including lap direction, seals, weeps and flashing sequence. |
| Extra sealant is used to hide poor fit. | Installer relied on field tolerance rather than approved joint dimensions. | Reject cosmetic sealing as a substitute for alignment; correct the substrate or panel installation. |
A practical sequence from concept through closeout
- Define the envelope brief. Record geometry, panel orientations, openings, adjacent materials, climate exposure, code jurisdiction and required fire classifications.
- Invite the selected fabricator to review the concept. Obtain written limits for shape, size, joints, supports, finishes and lead times.
- Build a coordinated detail set. Include windows, barriers, flashings, substrates, transitions, penetrations and movement joints for every system zone.
- Lock the specification. Name acceptable assemblies, required fire documentation, installer qualifications, submittals, mockups and inspection hold points.
- Review bids for equivalence. Compare system type, geometry capability, attachment, substrate, orientation details and assembly evidence—not just panel price.
- Approve shop drawings and samples. Resolve interfaces and finish expectations before fabrication, and make the approved details contract documents.
- Inspect the first work and concealed layers. Release each hold point only after alignment, membranes, flashings, joints and fasteners are documented.
- Close out with records. Collect as-built details, product instructions, maintenance information, fire documentation, inspection reports and approved substitutions.
What to keep in the project file
- The manufacturer’s current installation and maintenance instructions for each panel family.
- Approved shop drawings showing system boundaries, openings, flashings and transitions.
- Current fire-test, classification or listing documents for the installed assembly.
- Installer training or certification records where offered or specified.
- Substrate surveys, hold-point photographs, nonconformance reports and repair approvals.
- Evidence supporting any photovoltaic or transpired-solar-collector component.
The most reliable result is not a particular panel brand or profile. It is a documented chain from geometry and code review through fabrication, interface detailing, qualified installation and inspection before concealment.
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