Fibreglass roof, trims or no trims?

17 May 2017
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United Kingdom
Hi all. My extension parapet flat roof with roof lantern is almost ready to be fibreglassed (over 18mm osb). I have bought wall fillet trims to lap the fibreglass up onto the existing house wall and I was going to reinforce the roof lantern and parapet corners with an extra layer of glass matt before lapping the matt straight up onto the raised up stands. Is this best practice or should I be using trims on all upstand corners? What do you guys do? Thanks
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