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Thanks Xenon - I've "friend requested" you so I can send you contact details.

Xenon, you clearly know what you're talking about as you've described exactly what we have - there are concrete paving slabs holding down the edges of each section of insulating blocks. If we were to replace the felt with GRP, would you still advise replacing the insulating blocks on top...

I'm partly responsible for the maintenance of a small block of flats built in 2001. It has a flat roof, which consists of felt & asphalt on concrete, currently covered (as built) by large concrete slabs with insulation attached to their under sides. I believe this design is known as "warm...