Whilst putting a fresh coat of wood preserver on my Mothers fence recently I checked out the roof on her garden hut. It was custom made several years ago by a now retired ‘shed builder’ and bolted together by yours truly. The felting on top of the single slope is now cracking in various places, and there are several 2p sized holes in the outer felt, but no sign of water ingress on the internal roof timber. It all seems bone dry.
Rather than leave it, it’s a simple job to refelt it. Should i fix the new felt over the old, and if so paint a layer of bitumen over the old felt first? Or take off the old felt on a dry day, paint on some wood preserver ( plus anything else?) before fitting new felt with a 3†overlap under the side boards?
Any advice gratefully received
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Refelting a garden shed roof 
Refelting a garden shed roof 