[Closed] Flat roof replacement (garage) - fibreglass versus rubber

We replaced our asbestos garage roof with rubber about 5-6 years ago. Has withstood everything nature has thrown at it so far.

Firestone rubber on roof gives 25 year guarantee. Just need a decent roofer to fit i.e guarantee is for the materials amd not the roofers work.

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We have a [garage sized] beach hut in a row of 5 that all had fibreglass (over ply) roofs. After about 25 years they were seriously deteriorating and at least one hut had the fibreglass skin peel off in a storm.
We all had them replaced about 5 years ago with rubber and they've been great so far.

Would I use rubber again? Yes definitely.
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I asked this a few months ago, and the consensus seemed to be both are good, rubber perhaps slightly more dependent on a good fitter but the main difference is fragility- if people walk on the roof go for fibreglass, if not go for what your preferred/recommended installer normally uses

IMO the boarding under the roof is far more important than the roofing material. If the boards are rubbish/move then any roof material will leak sooner or later

EDPM is pretty easy to DIY.

fibreglass less so.

EDPM is pretty easy to DIY.
fibreglass less so.

I would say the opposite to above. GRP can make a load of popping noises. One builder said to avoid this screw down ply sheets with 100mm centres (not 300-400).

or OSB!

Our inherited flat roof extension has a GRP roof. I think it's about 20years old and sound but one of the main pluses for me is that is easy to DIY repair. I've done a couple of patches and covered a hole where I removed a redundant flue. It was easy to do with a automotive repair kit + suitable pigment and the patches have held no problem. I'm pleasantly surprised, I'd always been conditioned to hate flat roofs.