I had a tradesman rebuild my chimney up from under the roof.He had to cut the roof felt to do this.Should he have attached the felt to the chimney so if the rain ever gets through the roof tiles in the future it won’t rain in around the chimney?
No the lead work on the outside of the chimney will prevent any rain leaking through
It is advised that the felt does turn up the side of the chimney just incase any off the lead flashing or tiles fail as a second barrier
But on the other hand years ago there wasn't any felt there was only bodging trouled on to the back of the tiles or slates to prevent drafts this was a mixture of hourse hair and lime mortar mix
Putting felt on the chimney wouldn't really do much to be honest. We use lead around the chimney, chiselling into the mortar slightly to be able to get lead inside and then over the roof tiles/slates that was there is no chance of rain getting in via the chimney. I hope this has helped.
Providing the lead work has been done properly from the chimney above tiles then it shouldn’t leak, but I normally flab the felt up against the chimney then tack it with some Battern then lay your tile on top then fit your lead work
Should be lead around the bottom of the chimney if that helps