Replacing summerhouse roof covering

[Escort3500]

We’re getting tired of replacing the felt roof on our summerhouse every few years when it starts to swell and leak (despite careful application). It’s a shallow mono-pitch construction of T&G boards with the felt wrapped over the edges and closed with 4x1 fascia’s.

So we’re looking for an alternative that’s more durable and weatherproof. Is EDPM still the go-to solution, or have things moved on and are there other options that are now better? Also, how easy is it for a (reasonable) DIYer to undertake?

Any advice would be much appreciated.

[NDA]

I laid cedar tiles (shingles) on top of a failing felt roof on a pool house a few years ago - it worked very well... lasts forever.

[Escort3500]

NDA said:

I laid cedar tiles (shingles) on top of a failing felt roof on a pool house a few years ago - it worked very well... lasts forever.

Thanks. What pitch was it?

[OutInTheShed]

I looked at a house with cedar shingles on a garden office/studio.
They were as rotten as the tory party.
About 20 years old I think.