I had John Tydeman to completely re-roof my house in 2014. I had two leaks after he had finished which I thought he had fixed. It now transpires that one part of the roof has not enough pitch for the Decra covering he put on and I now have to have this stripped and re-done in a material more suited for the lack of pitch. I have emailed him to ask his thoughts on this but to-date no reply. I would not recommend his work.