Single vs. Double Curved Aluminum Panels for Facades

Identify the curvature of each panel and compare three fabrication concepts before requesting a quote.

Classify the panel rather than the facade

A cylinder bends around its circumference while remaining straight along its axis. It is a familiar example of a single curved surface. A dome curves in two principal directions and a saddle curves in opposing directions. Both are examples of double curvature. A building can have an overall compound shape while using a mixture of flat, single curved and double curved panels. Review the actual panel boundaries on the design surface before choosing a fabrication method.

Check the geometry with two sections

Supply sections through each critical panel in different directions and include the editable surface where available. One curved section cannot establish that the second principal curvature is zero. For a freeform surface, ask the designer to review its curvature across each panel area, especially near transitions. A rectangle drawn on a rendering also reveals little about how the finished panel meets its neighbors. Include the panel boundaries, joint targets and viewing orientation.

Compare the options in a representative bay

Ask the fabricator to evaluate a faceted layout, a layout using single curved panels and a layout retaining double curvature in the key areas. Compare deviations from the design surface, the visual break at seams and the effect on edge returns and fixings. A narrow panel may make a simpler geometry acceptable in one area while adding an undesirable seam elsewhere. Put the sample where the actual viewing distance and expected lighting can be judged.

Send a quote package with the alternatives identified

Keep the design surface and proposed fabrication surfaces on separate model layers or in clearly named files. Record the panel ID, surface type, finish, revision and quantity. Ask the fabricator which pieces need trial forming or tooling and what approval is required before production. The schedule checker can help clean up the CSV before sending it with the model.

Technical references

The sources describe general engineering considerations. Confirm product-specific values and project requirements with the responsible design team.