A “30 mm terracotta panel” label describes only a nominal thickness. It does not prove that a short hanging arm fits the panel’s back profile, engages correctly with its rail or belongs to an evidenced facade system. Compatibility must be established for the exact components and project conditions.

Archive boundary: the 2013 record named “Short Hanging Arm 4-2,” stated aluminum as the material and listed use for a 30 mm terracotta panel. That short entry and its image do not confirm current availability, dimensions, tolerances, alloy, finish, capacity, durability, fasteners, support system or approved panel match.
Engineering boundary: nominal thickness is not an installation instruction or compatibility class. The exact panel profile, arm, rail, fasteners, brackets, anchors, substrate, movement, exposure and project actions require coordinated evidence and approval by responsible qualified professionals. No universal load, spacing, span or anchoring value is provided.
Archived short hanging arm 4-2 for a 30 mm terracotta panel
Retained archive image of item 4-2. The 30 mm wording alone cannot verify fit or system performance.

Separate nominal thickness from interface geometry

Begin with the current panel code and its complete, revision-controlled profile. Record overall thickness together with back or groove geometry, internal webs, edge conditions, orientation and manufacturing tolerances. Two products carrying the same nominal thickness can present different interfaces to a hanging arm.

Obtain the current arm drawing with mating surfaces, engagement features, orientation, tolerances and material state. Confirm whether item 4-2 remains current. Do not treat a photograph, legacy name or convenient physical fit as evidence that the panel and component were designed and assessed together.

Build one coordinated interface schedule

Facing unit

Identify exact panel code, profile revision, production tolerances and permitted contact or engagement zones.

Hanging arm

Identify item revision, geometry, material, finish, orientation and its defined support or restraint function.

Rail and fasteners

Identify the matching support profile and controlled connecting components without assuming visual interchangeability.

Upstream support

Coordinate brackets, anchors and substrate through the complete project design and responsibility schedule.

Reference one approved revision for every item. If a panel profile, arm, rail, finish, fastener or supplier changes, reopen the compatibility review. A thickness note should never be allowed to conceal an uncoordinated substitution.

Include drawing cross-references and acceptance status in the schedule so reviewers can distinguish proposed, reviewed and released information. A clear status trail is especially important when legacy item numbers appear in correspondence but current offers use different codes or revised geometry.

Check engagement through the tolerance stack

Combine production, fabrication, survey and installation tolerances across the panel, hanging arm, rail, brackets and substrate. Define how the approved design accommodates variation while preserving its intended engagement, movement and inspection requirements. The tolerance study should cover likely extremes, not only nominal dimensions.

Review typical fields and difficult boundaries such as corners, openings, returns, bases, parapets and movement zones. Adjustment at one interface must not push another outside its assessed configuration. Any need to drill, grind, bend or pack parts should trigger formal design review rather than an informal site solution.

Match evidence to the exact configuration

Prepare a matrix connecting project criteria to current calculations, tests, assessments, drawings and material records. Every document should identify the relevant panel, arm, rail, fasteners, support conditions and scope. Evidence for a different groove, thickness, orientation or boundary condition is not automatically transferable.

The archive supplies no component or system capacity. The locally responsible design team should establish applicable project actions and trace their path through the complete assembly. Assumptions, limitations and unresolved gaps must be visible in the submittal instead of being hidden behind the phrase “for 30 mm panel.”

Keep the proposed configuration and its evidence aligned through tender, design development, procurement and construction. If cost or availability prompts an alternative, compare the full interface and evidence scope. Nominal thickness alone is not an appropriate basis for accepting the change.

Use a representative fit-up without overclaiming

Build a production-intent trial assembly using the proposed panel, arm, rail, fasteners and relevant adjacent components. Review fit, tolerance range, movement, access, sequence, inspection visibility and replacement assumptions against criteria agreed before assembly. Record component identities, lots and drawing revisions.

A successful fit-up can expose coordination problems, but it does not prove structural capacity or universal compatibility. Close observations through controlled drawings and the evidence register. If any part changes after review, decide formally whether the sample and related engineering must be repeated or updated.

Control procurement, receipt and concealed work

Carry the approved item codes and revisions into quotations, orders, packaging and delivery documentation. Verify material and finish records, dimensions, identity and condition under the project quality plan. Separate unapproved substitutions and nonconforming pieces so they cannot enter the work accidentally.

Establish hold points for first-of-type and concealed interfaces, with responsibilities and records defined by the project team. Photographs, checklists and zone or lot references should make the installed configuration traceable. Work must follow approved system documents and qualified supervision, not this archive page.

Release and maintain a verified system package

Release the panel profile, arm, rail, fasteners, brackets, anchors, support, calculations, evidence, drawings and quality requirements as one coordinated package. Keep a change log so later revisions do not silently break the original compatibility decision. At handover, retain installed identities, approved deviations and inspection records.

Use the terracotta rainscreen overview and project references for design context only. They cannot verify a specific 30 mm panel-and-arm pairing without the current controlled information for that assembly.

Checking a hanging arm for a 30 mm terracotta panel? Send the exact panel profile, component and rail drawings, fasteners, brackets, anchors, substrate, exposure, project criteria and evidence requirements to roger@lopoterracotta.com, or use the contact page. LOPO can provide current system information for engineering review.