thanks andybot, gonna try to edit the BM first thing on monday.
of course the glossiness is too much, but not by that far. there are glazed roof tiles that kinda look like that.
http://www.roeben.com/de/roben-international/produkte/dachziegel/glasierte-dachziegel/6_66.html
http://www.dachdeckerei-grafe.de/beispiele_ziegel_glasur_braun.htm
http://www.roeben.com/media/35_flandernplus_barolo_glasur.jpg
maybe its a german thing
what is the effect of subdivions on reflections?