Instead of replacing the felt roof we decided to use a product call.
How to repair a hole in roof felt.
We had a problem with our shed workshop flat felt roof leaking and needed a quick repair.
Alternately get more roofing felt and a tube of roofing caulk and glue felt patches over the rips with the caulk.
To replace a small section of roofing felt involves stripping the tiles from the roof and replacing felt between two joists.
From inside cut across the lowest part of the damage from rafter to rafter cut a piece of slaters felt 50 100mm wider than the rafter rafter size and taper this both sides slide the tapered edge into the cut and pin the sides to the rafters using lengths of batten.
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Screw the batten in place nailing may dislodge tiles.
Use a caulking gun to apply caulk to seal any holes that appear in the roof.