# Mapping a construction

**URL:** <https://community.realtimelca.com/t/mapping-a-construction/173>\
**Category:** Help\
**Created:** [November 4, 2024, 9:25am UTC](https://community.realtimelca.com/t/mapping-a-construction/173 "2024-11-04T09:25:07Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Stig](https://avatars.discourse-cdn.com/v4/letter/s/49beb7/32.png) [@Stig](https://community.realtimelca.com/u/Stig)\
**Post date:** [November 4, 2024, 9:25am UTC](https://community.realtimelca.com/t/mapping-a-construction/173/1 "2024-11-04T09:25:08Z")

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Hi, how do I map an entire construction with an EPD that contains all the materials in that construction?

I have a ceiling Type which consists of 3 different materials: insulation, wood lamellas and air, and I have an EPD for Basic Akustikpanel that I want to map to that type. But won’t RTLCA calculate the quantity/values 3 times this way (because of the 3 materials included in the Type?)

Thanks

 ![Screenshot 2024-11-04 at 10.22.06](https://europe1.discourse-cdn.com/flex005/uploads/realtimelca/original/1X/bcf669779a765766a4b38d9db96b5598ae2e024d.png)

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**Author:** ![MarkLabrosse](https://dub1.discourse-cdn.com/flex005/user_avatar/community.realtimelca.com/marklabrosse/32/206_2.png) [@MarkLabrosse](https://community.realtimelca.com/u/MarkLabrosse)\
**Post date:** [November 5, 2024, 8:39am UTC](https://community.realtimelca.com/t/mapping-a-construction/173/2 "2024-11-05T08:39:21Z")

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Yes, it looks like you are right there 🤔  
I can see that the declared unit is m2, so I would map `Basic akustikpanel` to one of the three materials you have, if one of these covers the the entire surface area. Then I would un-check the two other materials, as they are now redundant.  
Now I can’t see your data, but a assume that the insulation layer covers the entire surface area.

 ![image](https://europe1.discourse-cdn.com/flex005/uploads/realtimelca/original/1X/917a6d30886b8c6aea940be7fcdd41ac65854012.png)

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**Author:** ![Magda](https://avatars.discourse-cdn.com/v4/letter/m/dc4da7/32.png) [@Magda](https://community.realtimelca.com/u/Magda)\
**Post date:** [August 21, 2025, 7:52am UTC](https://community.realtimelca.com/t/mapping-a-construction/173/3 "2025-08-21T07:52:20Z")

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@Mads_Ditlevsen I asked the same question during the Molio-workshop on Tuesday - do you have any input for how to use the construction mapping correctly? Does it require modelling only one solid for all the materials included in a construction in Revit instead of modelling one per material?