> For the complete documentation index, see [llms.txt](https://docs.enercalc.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.enercalc.com/efr-user-manual/calculation-types/working-with-beam-calculations/concrete-beam-calculations25/beam-section-limitations.md).

# Beam Section Limitations

Which concrete beam section types are supported in ENERCALC for Revit and how unsupported geometry is handled.

Design of concrete beams using ENERCALC for Revit is limited to the following (3) section types:

* Rectangular Beams: [Rectangular Beam Sections - Unjoined](/efr-user-manual/calculation-types/working-with-beam-calculations/concrete-beam-calculations25/rectangular-beam-sections-un.md) OR [Rectangular Beam Sections - Joined](/efr-user-manual/calculation-types/working-with-beam-calculations/concrete-beam-calculations25/rectangular-beam-sections-jo.md)
* T Beams: [T-Beam Sections](/efr-user-manual/calculation-types/working-with-beam-calculations/concrete-beam-calculations25/t-beam-sections.md)
* Trapezoidal Beams: [Trapezoidal Beam Sections](/efr-user-manual/calculation-types/working-with-beam-calculations/concrete-beam-calculations25/trapezoidal-beam-sections.md)

The (3) additional types supported in ENERCALC but not in ENERCALC for Revit do not have physically modeled counterparts in Revit's default out-of-box family content:

* I (or H) Beams
* L Beams
* Inverted T Beams

![](https://4249100372-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgHVzpA9PT0VcuNGp6j39%2Fuploads%2Fgit-blob-2261509040e47896bde825e2f04188dcaf7cfabe%2Fclip0753.png?alt=media)

Any attempt to launch a calculation with an unsupported cross-section geometry will be halted with the following warning:

![](https://4249100372-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgHVzpA9PT0VcuNGp6j39%2Fuploads%2Fgit-blob-7cb86ff4ead9f04670727c99f0d0a0f427b72b2b%2Fclip0754.png?alt=media)

In cases where the concrete beam element is found to be joined to a concrete floor slab, calculation launch will be halted with a warning if the beam is found to have a slope that differs from that of the slab:

![](https://4249100372-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgHVzpA9PT0VcuNGp6j39%2Fuploads%2Fgit-blob-fd4ecbe7615f0163c55f330ceb1e97cd4ab8bc96%2Fclip0814.png?alt=media)

Any verifications, approvals, or manual changes related to the geometry of the beam cross-section will be addressed on the tab labeled "Section Geometry":

![](https://4249100372-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgHVzpA9PT0VcuNGp6j39%2Fuploads%2Fgit-blob-e79fccc6d01115ac11112b4aefa210bb777c41df%2Fclip0773.png?alt=media)


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