Expression question

[Mats_Knutsson]

Hi,'How can I calculate total area of windows in the exterior walls divided by total net area of outside of exterior walls? I get a result only by using the one windows and wall area but it's the inside of the wall which is not what I want. When dividing window ara by wall aoutside face area I get no result (property as number and available for all...)
Br,
Mats

[Anonymous]

Hi Mats,

Can you copy your code or the part of the code that is not working?
The one below seems to work fine for me (Data Type: Number).

{Property:Wall/Area of the Windows} / {Property:Wall/Gross Surface Area of the Wall on the Outside Face}

/Martin