Shed roof leaking - felt kinked up in a ridge

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My shed roof felt has expanded and pushed up a ridge right across. The edges were nailed down so could not move causing a ridge on expansion.
Any suggestions on how to smooth out the felt ?
 

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I very much doubt if it is possible to smooth that out without it cracking and causing a worse situation. I cannot understand how it got like that in the first place but I know that there are all kinds of DIY idiots out there. Nuff said, having receently had to sort a similar problem on my shed, I would recommend tearing it all off then get some fresh felt from Wickes together with a tin of adhesive (black stuff) and redo it. NB don't use nails except at the edges or you will soon get another set of leaks.
 
maybe thats where 2 sheets of ply abut? might fix itself when humidity drops
fix might be strip the felt and overboard thin ply with joints going vertically down the roof then refelt. Or use t&g OSB
 
It's me the OP ! The ridge/ripple caused pooling and trapped debris and moss. I cleared the moss etc and it's a bit better but still leaks. The leak is all along near the ridge but also appears further down at the next joint. I think the water seeps along under the felt. I will try fixing when the weather's warmer and the felt a bit softer. Take out the nails and try flattening the felt and use some bitumen. The other side of the shed is fine - no rippling. The shed roof is T&G pressure treated so should hold up ok.
 
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