# Building
**URL:** https://forums.buildingsmart.org/c/rooms/building/22.md
[Latest](https://forums.buildingsmart.org/latest.md) · [Categories](https://forums.buildingsmart.org/categories.md) · [Tags](https://forums.buildingsmart.org/tags.md)
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## [About the Building category](https://forums.buildingsmart.org/t/about-the-building-category/40)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\
**Replies:** 0
The Building Category hosts project information and topics coming and gathered from the bSI Building Room.
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## [IfcCurtainWall](https://forums.buildingsmart.org/t/ifccurtainwall/6609)
**Author:** [@pandyapalak](https://forums.buildingsmart.org/u/pandyapalak)\
**Replies:** 1\
**Last updated:** [October 16, 2026, 6:55pm UTC](https://forums.buildingsmart.org/t/ifccurtainwall/6609 "2026-10-16T18:55:45Z")
Hello Everyone, I have a question regarding the IfcCurtainWall. According to the IFC defenition of the Curtain wall. It is an element, which is hung from the edge of the slab and not on the slab. Then, how will you defi…
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## [IfcDoor and IfcWindow : add "ClearHeight" and "ClearWidth" parameters](https://forums.buildingsmart.org/t/ifcdoor-and-ifcwindow-add-clearheight-and-clearwidth-parameters/3863)
**Author:** [@XColl](https://forums.buildingsmart.org/u/XColl)\
**Replies:** 11\
**Last updated:** [September 1, 2021, 10:42am UTC](https://forums.buildingsmart.org/t/ifcdoor-and-ifcwindow-add-clearheight-and-clearwidth-parameters/3863 "2021-09-01T10:42:40Z")
Hi all and hi @TLiebich In some country regulations, there are specific technical rules about minimum free pass dimension for Doors and Windows (for example: fire exit regulations, ventilation regulations, habitability …
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## [ProvisionForVoid](https://forums.buildingsmart.org/t/provisionforvoid/1279)
**Author:** [@agron](https://forums.buildingsmart.org/u/agron)\
**Replies:** 3\
**Last updated:** [August 29, 2019, 8:24am UTC](https://forums.buildingsmart.org/t/provisionforvoid/1279 "2019-08-29T08:24:50Z")
While attending the bsI in Düsseldorf, there was a presentation about the IfcProvisionVoids. A very interesting subject which I would like to give feedback if needed. We have a real project where our team has successful…
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## [FireSafety Engineering](https://forums.buildingsmart.org/t/firesafety-engineering/1216)
**Author:** [@anne.mevatne](https://forums.buildingsmart.org/u/anne.mevatne)\
**Replies:** 1\
**Last updated:** [March 26, 2019, 3:05pm UTC](https://forums.buildingsmart.org/t/firesafety-engineering/1216 "2019-03-26T15:05:41Z")
Thank you to Angelika Kneidl and Michael Stromgren for presentation of a new project propsal Fire Safety Enigneering presented to the Building Room in Dusseldorf. The presentation can be found here: Please continue the …
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## [IFC4precast - status and updates](https://forums.buildingsmart.org/t/ifc4precast-status-and-updates/1220)
**Author:** [@anne.mevatne](https://forums.buildingsmart.org/u/anne.mevatne)\
**Replies:** 0\
**Last updated:** [March 26, 2019, 3:49pm UTC](https://forums.buildingsmart.org/t/ifc4precast-status-and-updates/1220 "2019-03-26T15:49:14Z")
Status and updates from the proejct were presented at the Summit in Dusseldorf. The presentation can be found here: The discussion can be continued here, and more information can be found in www.ifc4precast.com
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## [Building Energy Modelers and Simulation Engines](https://forums.buildingsmart.org/t/building-energy-modelers-and-simulation-engines/875)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\
**Replies:** 1\
**Last updated:** [January 30, 2019, 3:53pm UTC](https://forums.buildingsmart.org/t/building-energy-modelers-and-simulation-engines/875 "2019-01-30T15:53:15Z")
I am looking for info on building energy simulation engines and associated modelers extensively used in the AECOO industry, but with IFC import capabilities. I am familiar with Energy+ (US DOE), ApacheSim (IES), TAS (EDS…