Tile Torching not Replaced - How to Insulate?

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Looking at a 1920s roof with no felt - some tiles (flat and ridging) were replaced after storm damage a while ago, but none of the replacements had the torching put back. There are some big gaps and it’s very draughty - I was thinking of trying to line it across the rafters with a membrane, rather than fill between with Celotex or similar, because there are some awkward shapes.

Is there a better option?
 

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No, but the rooms underneath were cold before, and are even colder now - and to insulate the attic floor would be reasonably involved due to layout, joist depth etc.
 
Insulating the ceiling of rooms below an unheated loft is normal, and far better than reinstating torching.
 
Yes, I get that - having the wind whipping through the attic has made the house cool down much more quickly upstairs than with the old torching in place.
 
Yes, I get that - having the wind whipping through the attic has made the house cool down much more quickly upstairs than with the old torching in place.
A cold drafty loft is healthy and has no bearing on the room temp's below, as long as there is adequate loft insulation at ceiling level.
 
There isn’t, and putting it in is going to be a bigger pain than insulating the roof. Imagine I’ll end up doing both.
 
Excuse my ignorance, but what exactly, is this 'torching' you are referring to?
 
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