Tile Torching not Replaced - How to Insulate?

[RealPolitik]

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?

 

[datarebal]

Draught is your friend

 

[RealPolitik]

Not this much draught…

 

[JohnD]

Do you spend time up there?

 

[RealPolitik]

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.

 

[JohnD]

Insulating the ceiling of rooms below an unheated loft is normal, and far better than reinstating torching.

 

[RealPolitik]

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.

 

[noseall]

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.

 

[RealPolitik]

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.

 

[conny]

Excuse my ignorance, but what exactly, is this 'torching' you are referring to?

 

[RealPolitik]

Mortar on the reverse of the tiles to seal the gaps when there’s no felt.