First of all you have to be sure you target the right elements
Then you have to be sure you call the right area
In this picture below you can see there are a lot off different area about roof
Choose the one that fits your needs
You can choose an element and compare "by hand" the desired surface with the surface explained in your nomenclature
I've done a little illustration about wall areas (The principle is the same for all elements of the model) : https://bit.ly/32Mdy7O
Then you have to be sure you call the right area
In this picture below you can see there are a lot off different area about roof
Choose the one that fits your needs
You can choose an element and compare "by hand" the desired surface with the surface explained in your nomenclature
I've done a little illustration about wall areas (The principle is the same for all elements of the model) : https://bit.ly/32Mdy7O
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