Dry verges - needed on gable ends?

[elvis80]

Hi. This is my first post, so bear with me, please.

We've been building a house for a couple of years and it's coming to an end now. But we have a potential issue with the roof, particular the dry verge at the gable ends.

We have had to give up on our builder, as he's off sick for who knows how long (it's been a year...)

Here are some pics of the gable ends...
https://i.postimg.cc/ZYx9F4VL/PXL-20230801-083306932.jpg

https://i.postimg.cc/4N4YWq0R/PXL-20230801-083302991.jpg

https://i.postimg.cc/MZ7zkQYv/PXL_20230904_072429115.jpg

And from the side, you can see how little overhang there is.

The plan is/was to put wrap around metal fascia over the end rafter which also covers the tiles (as per the last pics).

Here's a pic of them having been started....

https://i.postimg.cc/85WNzJQX/PXL_20230904_072513792.jpg

However, someone who used to be a roofer - who was visiting the house - said there's a danger of water getting in under these, especially because we have flat tiles and especially where we have a dormer, here's a pic...

https://i.postimg.cc/Kj2FkGmG/PXL_20230904_072522885.jpg

He was concerned the end rafters will get wet/rotten over time.

I think my options are:
1) Remove 1 tile all the way along and slap on a type R dry verge. Fixed from above. I'd still use my wraparound fascia on top.
2) Try and slip some type R under the ends of the tiles, fix from the sides and trim if and where it encounters any screws through the tiles. Again, I'd still use the fascia.
3) Remove 2-3 tiles and batten (c.600mm) and extend the roof. This is beyond my skills. I have the spare tiles. Again, I'd use the fascia.
4) Add a batten to the side of the rafter and stick a dry verge on that. Again, then use the fascia.

The tiles are Marley/ concrete.

Anything else I should consider as a solution?

Is this actually worth worrying about?

Apologies if I've got any terms wrong here. I'm just a DIYer.

[MikeSharp01]

Cripes work to do here - You need to get protection down much deeper than type R will give you on the final pic, cannot see the ends of the others. I would use a board along the verge and fit the dry verge to that and try and get it under the tiles as best you can, looks like you will need to lift the edge of the tiles clear of the batten at the edge to make this work. The dry verge I looked at (here) has a feature to take the board to give you more depth down the wall. If you cut the verge round any fixings you will break the flow down the under shield and let water in. 

[elvis80]

2 hours ago, MikeSharp01 said:

Cripes work to do here - You need to get protection down much deeper than type R will give you on the final pic, cannot see the ends of the others. I would use a board along the verge and fit the dry verge to that and try and get it under the tiles as best you can, looks like you will need to lift the edge of the tiles clear of the batten at the edge to make this work. The dry verge I looked at (here) has a feature to take the board to give you more depth down the wall. If you cut the verge round any fixings you will break the flow down the under shield and let water in. 

Thank you for this. V helpful. I think the first thing I do is suss out whether I can get the sample of type R I have under the tiles, or whether the screws get in the way. Take your point about cutting them down. 

One bit I didn't quite get. Why would I need a board on top of the rafter to fix the type R to, please? Why not fix to the rafter as it's flush with the tile? 

 

Also, when you say 'down much deeper' I wasn't quite sure what you meant.

[MikeSharp01]

You are going to need a board in that groove of the type R down the wall - not sure what the correct architectural name is. If I had a pen I would draw it but I am on a train! The type R does not have enough cover down the wall to be sure the weather cannot get up under and into the battens area - a board would cure that. 

[MikeSharp01]

It turns out I do have a pen

 

[elvis80]

1 hour ago, MikeSharp01 said:

You are going to need a board in that groove of the type R down the wall - not sure what the correct architectural name is. If I had a pen I would draw it but I am on a train! The type R does not have enough cover down the wall to be sure the weather cannot get up under and into the battens area - a board would cure that. 

Ah, got you! Thanks Mike. Again, v much appreciate the reply. 

[elvis80]

Just now, elvis80 said:

Ah, got you! Thanks Mike. Again, v much appreciate the reply. 

Lovely drawing ☺️