How to model a moisture sink

[David Lam]

Hi all
I had a good search in the forum and couldn't find an answer to what I thought would be simple (easy and complex right?!).

I want to model a cavity drain to see the impact that a moisture sink has.
Reading around it looks like I need to enter a Moisture Source with a negative value. However this does not seem possible.

I was expecting to be able to enter in the box in the screenshot below but this doesn't work. Can you help please?

Screenshot 2021-05-18 194753.jpg (59.04 KiB) Viewed 4444 times

[Thomas]

Hi David,

the monthly moisture loads are meant to be a challenge for the drying potential of the building component and therefore accept only positive source strengths.

To define a moisture source with negative source strength, please use the option "Transient from File". The help file explains the format of a user-provided source strength file.

Kind regards,
Thomas

[David Lam]

Wonderful.
Thank you.