Underground Concrete structure

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Nidhi
WUFI User
WUFI User
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Joined: Mon Jun 01, 2026 10:19 am -1100

Underground Concrete structure

Post by Nidhi »

Hello we are building an underground concrete structure that I have been testing details in WUFI. The project can be seen here - https://www.youtube.com/watch?v=fc9kyEWZ-f8

The build up at the top of the arch or ceiling is from inside to outside - Concrete, waterproofing, 1-2 inches of foam and 24 inches of Earth.

hen I model I am seeing that the local hygrothermal load graph shows values at the point the water proofing touches the concrete so essentially there is mould growth there. But when I open the Wufi bio it is always green. It says there is no mould risk. I feel like I am doing someting incorrectly but not sure what?

I also have another situation where we are putting a radon barrier in the crawl space and then the client wants us to insulate the crawl space and bring it in the conditioned space. But when I did the WUFI analysis of that detail I also get similar readings. where wufi bio shows no risk but the local hygrothermal graph shows that the mould will be present. Am I reading it incorrectly?
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