I have just had a quote (along with the usual sales BS) for a flat roof to be replaced with Sarnafil by a large local company. The roof is second storey with very good access and is about 35m2 with two parapets. Is it just me or is £13,000 a bit over the top for a flat roof? What price should this be per m2 fully fitted and insulated? How would this compare to the cost of using felt?