On Thu, 12 Mar 2015 12:55:07 +0000, The Other Mike
A builder I knew was a great fan of them, although his were a simpler
design using conventional bitumen/ felt as the substrate. As he
remarked, putting insulation and gravel on top protected the felt from
its greatest enemy - sunlight - and also removed the worse temperature
excursions. He had installed dozens, some of which were 30 years old
when I knew him and some even had Chamomile grown on top. He wasn't
aware of any having failed.
If you try to move the structure, you may well cause a leak.
You can buy cans of bitumous gloop intended to make roof repairs, you could
progressively add layers of this stuff to build up the top surface.
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