Thermal Transmittance for slab

[AndreaFC]

Hi all,

 

I wonder if anyone can help with this;

Firstly, I noticed that for my building elements, Vectorworks does not take the calculated U-Value and save it as the thermal transmittance in the IFC Data. For walls I have been manually inputting the u value which is fine but tedious.

Now I have a slab and when I go to the IFC Data to try to put the thermal transmittance in I am unable to put in the value. This field is blocked? Other fields are open for example acoustic rating but the thermal transmittance - why is this? How do I get Vectorworks to automatically source the values from the calculated U value? 

 

Thanks