SuzySue wrote:

If a terraced house had a slate roof with no underfelt, would this be
something that most people would want fixed immediately i.e. taking
off all the slates, and installing underfelt and replacing all the
slates again.

Or is having no underfelt on a roof not a major problem, and something
which can be lived with i.e. not usually considered an "urgent"
problem.


Actaually the felt does eff all. Its there to stop the slates being
blown off.

It does make the rough moree draughty even than a building inspectors
mandatory eaves vents though, so you might rather want to insulate
counter batten, insulate and board out the loft for snugness...

MUCVH better bang for your buck than re-felting.

Of couse, if the roof ever needs redoing in toto, by all menas felt it.
Its not expensive.