Sound deadening in the 'high roof' of a VW T6 LWB?

I did my Midroof, before I applied closed cell foam, I would most likely not worry about it if I was to do it again

I believe they are both the same Plastic/fibreglass material and it doesn’t drum like sheet metal
 
I don’t own a High Roof but any additional weight added that high up will affect the handling.
If you are planning at driving at more than 50 MPH I would sound deaden the leading face which will be exposed to wind and is closest to your ears.
Maybe just closed cell foam if the GRP roof doesn’t ‘drum’.
 
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