Flat roof - south facing

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Hi, we are having quite a bit of work done on our place.
One bit is a new flat roof..

Architect specified "fibreglass roof finish laid by specialist installer"
Builder is planning on going for the below 2 products, again laid by a specialist.

IKO SBS Torch-On Cap Sheet
Anderson Premium SBS Torch-on Roofing Underlay - Icopal

Any opinions on the suitability of fibreglass versus this torch on underlay and cap sheet?

Thanks.
 
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They both will perform equally if fitted properly.

But the felt is probably s lot cheaper for the builder to do.
 
How many square metres does the new roof cover? and did the Architect specify a particular brand of fibreglassing system? Some are more flexible than others and a south facing roof is going to get the sun (if we ever have a summer again in the UK) so thermal expansion might, if not already needs be taken into account.
 
The flat part is approx. 4m x 4m
No particular brand specified.

Indeed. I would be less worried if it were a north facing roof.
The wooden windows we had on the south facing side took an absolute beating. So we know what the sun can do.

Cheers.
 
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All roof coverings are designed for "south facing" roofs. Along with north, east and west facing roofs ". They are not direction specific.
 
OK. Thanks all I think I'm happy for the builders to proceed with the sbs torch on stuff.
 
I'd be happy with that - there are threads here somewhere about Fibreglass roofs making noise.
 

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