According to the building expert in the telegraph the lining is only to keep the house interior dry until the tilers have.
How to repair roof felt in loft.
So check the roof for any broken or loose tiles.
A thin layer of fibrous material is inserted between the lead and the valley board such as breathable membrane roofing felt but not mineral felt.
However this isnt the only problem.
To replace a small section of roofing felt involves stripping the tiles from the roof and replacing felt between two joists.
The felt is a secondary water barrier in case a tile is broken ect.
You can use flashing tape to fix the holes in the underfelt.
Make sure the caulk is rated for the temperatures and apply it liberally so you don t create a water pocket.
The lead is finally fixed in place with copper nails hidden under the overlaps.
But make sure you check the instructions and leave enough time for the sealant to dry before sticking the new patch down.
This will cost around 460 510 made up of.
You can fix tears in your roofing felt by putting a patch of new felt underneath.