Newbie question re repairing hole in tiled roof after removing chimney...

Hi, this is my first post on this website so hello to everyone who reads this post

I've just removed a brick flue/chimney which ran from an old and no longer used gas boiler, at ground level in my kitchen, up through the loft space, and out through the roof. It was basically a brick chimney from start to finish, which was taking up unnecessary space in the kitchen area and becoming a liability in terms of rain leakage due to age and poor pointing/flashing condition.

The removal has obviously left an opening in the roof, which is approximately three feet square and needs the usual roofing felt, battens and tiles required for the repair.

The roof angle is fairly shallow and easily walkable, so I am doing the repair myself and I have suitable replacement tiles, battens, roofing felt etc. to do the job.

After inspecting the 'hole' left by the removal, it is reasonably straightforward to make good the battens and tiles, however, I am unable to get the top edge of the new piece of roofing felt to go sufficiently under the existing felt, due to structural timber-work being in the way.

I'm concerned that, should any water make its way past the roofing tiles, it will run under the replacement felt and into the loft area.

Can anyone recommend a suitable method of repairing the roofing felt and making this part of the repair properly weatherproof?

Thanks for your time and attention,

Tom.

 

How far can you get your new felt tucked up under the old? I like to see more with shallower pitch roofs but generally 6" is sufficient.

 

Not very far.

The original felt is very ragged edged and in some places I can't get the new felt underneath at all.

I have just tried to use a bonding mastic to provide a seal but I can't get enough access to the original felt to make an adequate seal. ( the mastic does stick to your hands really well though ! )