firstname.lastname@example.org (SuzySue) wrote in message
Hi Susan: neither, it can be lived with indefinately. All original
Victorian slate roofs are feltless.
There are 2 minor caveats with unfelted roofs:
1. Theyre almost always very old and the occasional slate will
probably drop off and need refixing. Budget maybe £30 a year.
2. They let water wind and dust in, the wind dries out the water no
problem. It just means you cant use wind blocking insulation up
against the woodwork, as it would trap water.
If youre buying one, look at the slates, replace any broken ones,
refit fallen ones. And if the roof has more than about 25% of slates
fixed with visible metal tabs its time to consider reroofing.
There are lots of unfelted roofs still working without any problem.
Not a problem and anyway the slates have a much longer life than felt which
was installed in the past. My slate roof has wooden sarking. When I
installed some Velux windows I found the sarking was in perfect condition
after 100 years. One problem you may come across is that surveyors will
report seeing daylight. Possibly a true report but worthless without
qualification which it never is. Its the through ventilation which keeps
the roof timbers dry something some BCOs fail to recognise also when
insisiting on roof vents.
Actaually the felt does eff all. Its there to stop the slates being
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.
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