Thermoseal reflective foil roof sarking is a non permeable vapour barrier to reduce the transmission of moisture into the home and contribute r value to the roof system.
Replace roof sarking.
When i retrofitted foil sarking beneath charcoal tiles the temp difference in the roof cavity was easily 10 15 degrees from so bloody hot standing under the manhole it feels like standing in front of an open oven to i can work in the roof space for a few hours even in summer.
It does fall off over the years.
Sarking felt is to prevent dust and draughts blowing under the slates.
Recommended for use in warmer climates.
Lay the sarking sheets on the roof cavity with care and precision.
Unfasten all clips that take hold of the roof tiles.
If some are damaged replace them with new ones after putting the tiles back.
Holes in roofing felt are quite common here we repair a hole in some roofing felt that is underneath the tiled roof.
Someone might be able to help you out for as low as 150 to 350 per.
Remove the ridge capping to easily get rid of roof tiles and clips.
Obviously the roof is original ie never been re slated.
The average price range for a roof replacement can run from 260 to 700 per square foot depending on the roofing material used.
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If the damage is more extensive and the roof is leaking it is normally a sign of other problems with the roof and the entire roof may need to be refurbished.
The only other thing the felt does is to keep out windblown snow and the only way to replace it is to strip and re tile slate the whole roof.
This would involve stripping the lower layers of tiles from the roof and adding a 500mm strip of eaves protection felt before reinstating the tiles.
Dismantle all roof battens to enable you to install sarking beneath them.
Before using felt the slates were back pointed with sand lime cement and horse hair mix.
Enviroseal proctorwrap roof sarking is vapour permeable allowing water vapour to pass through it whilst preventing the entry of.
Having no under felt unless there are missing slates will not cause rot.