To replace a small section of roofing felt involves stripping the tiles from the roof and replacing felt between two joists.
Replacing roofing felt from inside loft.
This will cost around 460 510 made up of.
The felt near the eaves near the guttering can age faster than felt further up the roof.
It s about a 2 mtr length and two rafter spaces wide.
You can purchase self adhesive flashing which in small pieces should adhere well to the felt and should be suitable for the heat and cold experienced as roofing underlayment.
Where wind driven rain is working under the roof and causing leaks then the felt will need to be replaced.
Replacing just the felt that has physically broken can fix any leaking without the expense of work on the whole roof which usually requires scaffolding.
The tiles are the fairly common large concrete type and the roof has 4 x2 rafters and standard 1 battens.
However it can be difficult and unsafe to do it on a ladder but you might find someone who can do it.