> For the complete documentation index, see [llms.txt](https://docs.betterbuilding.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.betterbuilding.io/support-and-training/other-support/faqs/building/how-do-i-model-a-curtain-wall-spandrel.md).
# How do I model a Curtain Wall Spandrel?
A curtain wall spandrel is the opaque, non-structural section of a curtain wall system, typically located between the vision glass and the floor slab. It conceals structural elements such as slabs and mechanical systems while contributing to thermal performance and maintaining visual continuity across the façade.
In energy modelling, a curtain wall spandrel can be represented as a Concept Wall by assigning appropriate thermal properties that reflect its geometry and material composition. For aluminium spandrels, a typical Total R-value is approximately 0.55 m²·K/W, though this can vary depending on construction details and insulation strategy.
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