The lifespan of traditional roof coverings is generally superior to later manufactured materials.
How to repair roof felt in loft.
If you have a problem with your flat roof it s best to get a professional to look at it although you can buy a special sealant for making your own repairs to splits or blisters in the roofing felt.
I have a loft storage space which is covered by roof felt internally i reckon they were rolled round and nailed to the roof internally.
Many roofs function quite well without any roofing felt so small tears and damage to roofing felt are not in themselves reasons to spend money on repairing it.
The longevity of a roof covering depends on the quality and age of the material and the degree of exposure.
There are a few small rips in the felt about 5cm or 10cm long.
Sometimes the water shows up at a ceiling spot distant from the leak.
In the loft there may be damp smells and localised staining from water ingress.
Where wind driven rain is working under the roof and causing leaks then the felt will need to be replaced.
Severally parts of that felt were destroyed by wasps hence i do get small wasp hives inside the loft.
I have a normal uk type cold roof with interlocking tiles over the roofing felt.
Flat roofs are usually covered in bituminous based asphalt or roofing felt and tend to have a shorter life than pitched roofs.
If your ceiling has a plastic vapor barrier between the drywall and the attic insulation push the insulation aside and look for flow stains on the plastic often water runs to openings in the vapor barrier such as at ceiling light fixtures.
Some roof leaks are tough to locate.