Where wind driven rain is working under the roof and causing leaks then the felt will need to be replaced.
How to repair a hole in roof felt.
Use the putty knife or your finger to spread the caulk around to cover the hole.
Make sure the caulk is rated for the temperatures and apply it liberally so you don t create a water pocket.
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.
Instead of replacing the felt roof we decided to use a product call.
Alternately get more roofing felt and a tube of roofing caulk and glue felt patches over the rips with the caulk.
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To replace a small section of roofing felt involves stripping the tiles from the roof and replacing felt between two joists.
Use a caulking gun to apply caulk to seal any holes that appear in the roof.