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.
How to repair roof felt in loft.
According to the building expert in the telegraph the lining is only to keep the house interior dry until the tilers have.
The lead is finally fixed in place with copper nails hidden under the overlaps.
You can fix tears in your roofing felt by putting a patch of new felt underneath.
Nothing lasts and the loft is still bone dry though well ventilated.
Make sure the caulk is rated for the temperatures and apply it liberally so you don t create a water pocket.
You can use flashing tape to fix the holes in the underfelt.
To replace a small section of roofing felt involves stripping the tiles from the roof and replacing felt between two joists.
However this isnt the only problem.
So check the roof for any broken or loose tiles.
Where wind driven rain is working under the roof and causing leaks then the felt will need to be replaced.
The felt is a secondary water barrier in case a tile is broken ect.