andrew wrote:
Phil L wrote:

Why not use normal breathable roofing felt? - it's cheap and can be
stapled to the joists just the same and will also cut down the
amount of condensation reaching the tin sheeting, with the added
bonus of allowing the old timbers to breathe.

Yes this is what I was asking, would it be better to staple it in
between the rafters or staple it across the rafters horizontally, as
one would fix slater's felt on the top side of the rafters.


That's how I would do it, starting at the ridge and working downwards
overlapping each piece by 150mm

I have used the proper Tyvek, under profiled plastic coated steel
sheet, on rooves where we have replaced a certain fibre reinforced
corrugated concrete sheet, and this seems to be working fine but this
is on top of the rafters and in loose but direct contact with the
steel sheet.

AJH



--
Phil L
RSRL Tipster Of The Year 2008