# How do I categorise glazing within non-curtain walls?

**URL:** <https://forums.buildingsmart.org/t/how-do-i-categorise-glazing-within-non-curtain-walls/1779>\
**Category:** Users\
**Created:** [September 3, 2019, 7:28am UTC](https://forums.buildingsmart.org/t/how-do-i-categorise-glazing-within-non-curtain-walls/1779 "2019-09-03T07:28:25Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Moult](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.buildingsmart.org/moult/32/196_2.png) [@Moult](https://forums.buildingsmart.org/u/Moult)\
**Post date:** [September 3, 2019, 7:28am UTC](https://forums.buildingsmart.org/t/how-do-i-categorise-glazing-within-non-curtain-walls/1779/1 "2019-09-03T07:28:25Z")

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With a regular curtain wall, the glazing portion is classified as `IfcPlate` with `PredefinedType` set to `CURTAIN_PANEL`.

However, curtain panels are only used as `an exterior wall of a building which is an assembly of components, hung from the edge of the floor/roof structure rather than bearing on a floor`. ([source](https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2_TC1/HTML/schema/ifcsharedbldgelements/lexical/ifccurtainwall.htm))

There are other walls which have `IfcMember`s too such as shopfront walls or internal office partitioning with glazing. How should we properly classify the glazing portion in this scenraio?

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<div class="post-metadata">

**Author:** ![Moult](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.buildingsmart.org/moult/32/196_2.png) [@Moult](https://forums.buildingsmart.org/u/Moult)\
**Post date:** [August 4, 2021, 11:39pm UTC](https://forums.buildingsmart.org/t/how-do-i-categorise-glazing-within-non-curtain-walls/1779/2 "2021-08-04T23:39:13Z")

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Just answering this for closure, it’s still an `IfcPlate`. Key phrasing in docs are:

> NOTE Although **not necessarily** , plates are **often** add-on parts.