I have a Sarnafil single ply roof installed on my recently completed extension by a professional installer who was sub-contracted by my builder. After the bad weather in December (and once the snow had thawed) I had noticed that in a couple of small places the edging piece which goes from the last 6 inches of the roof edge over onto the vertical was starting lift off the membrane underneath. I tried to contact my builder who didn't respond (not that surprising) so contacted Sarnafil who told me a guarantee had been issued and that I should contact the sub (they gave me the details). Contacted the sub to be told my builder had never paid them and has since gone out of business. I had paid the builder in full months before. The sub is withholding the guarantee and wants me to pay for 50% of the roof again. Sarnafil are largely standing by their installer. Whilst I sympathise with them, their contract was not with me and I have honoured mine with the builder. I can't afford to pay for products twice. So, can the small edges that have lifted be stuck back down? Is it a glue that is used, it looks like the edge was not properly adhered in a couple of places but I have no idea if this is DIY achievable or would require an expert. I would rather do it my self it I can. Any help appreciated!