There are multiple rips in the roofing felt of my home to the point the roofing felt doesn't really exist towards the end of the roof area in large places. The roofing felt is in poor condition but everything else looks to be in good condition (I can see some of the battens). How urgent would this job be to fix?
The felt is there to stop wind, and snow driven by it, ending up in the attic/loft. Without it, on a bad day, the weather can end up inside the house, taking a long time to dry out, causing all sorts of extra damage.
Difficult without a picture and knowledge of location, but basically needs replacing somehow.