• We're about to do a double dormer loft conversion and ground floor extension, both of which will feature flat roof sections. Our builder is leaving it up to us to decide on the type of flat roof surface finish: felt, fibreglass or resin.

    What are the pros and cons of each? Any experience/reasoning behind choice would be much appreciated...

  • My choice would be driven by what the guarantee is on each option and what it costs.

    Personally I'd go for whatever the no cost option is which is still covered by the loft guarantee

    On my single story kitchen diner extension I went for fibreglass because absent anything happening to it which really fucks it up I can repair it easily myself. The kitchen diner does not have a ten year guarantee. If anything happens to it I'm likely on my own. On my loft it's a 3 layer felt system because that's what the loft company used and it has a ten year guarantee on it.

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