Is there a way to read and map or only read the elevation parameter that controls the height for wall hosted families?

Thanks,
Is there a way to read and map or only read the elevation parameter that controls the height for wall hosted families?

Thanks,
Yes - Can you show us your graph? 
there is no Elevation parameter that i can read it 
Sorry if you had already worked this out… you were reading a Type but the parameter is an Instance…
Hope that helps,
Mark