Venting Through Fascias

[AndyMo]

Sorry, think I posted this in the wrong place in "Building" and here would be more suitable.

Wondering about the logic/sense of providing ventilation through the fascia boards.

I realise that usually you would vent through the soffits or have some over-fascia ventilation but I have neither and am concerned about the lack of ventilation of the loft space.
I know the original asbestos soffits are encapsulated within the newer overclad fascias and soffits and so it's not really an option to go up through the soffits to add soffit ventilation.
The roof is of small non-interlocking tiles and therefore the first two rows of tiles are pinned and I have been told this makes it a nightmare to fit any over-fascia ventilation.

Thought that some vents could be fitted through the fascias (tucked as high up as possible behind the gutter, taking the gutter off to get access).

What do people think? Would this be a credible option? Any concerns or pitfalls? Might it cause more problems than it solves? Should I just bite the bullet with the bigger job of the over fascia ventilation? Should I just leave it without ventilation?

Thanks in advance

 

[Mw Roofline]

As long as there was a waterproof felt edge then technically you could vent as high as possible behind the gutter but it’s a bit Heath Robinson and wind can gust rain upwards behind the gutter. If the soffits are azzy and you can’t take bottom row tiles off why don’t you pop in a few roof tile vents? Just 2 roofing tile vents On each side of an up and over roof does a better job than circular vents on a soffit at every foot.

 

[AndyMo]

Thanks, was wondering whether there'd be a risk of water ingress putting vents in fascias. Not sure I'd trust it with the minimal tile overhang there is (will see about postinh some photos later to show). Vent tiles might be a good solution.

 

[AndyMo]

As long as there was a waterproof felt edge then technically you could vent as high as possible behind the gutter but it’s a bit Heath Robinson and wind can gust rain upwards behind the gutter.

Installers of what is there (only just finished) have left me with a real mixed bag and for the most part it doesn't seem great.
As for the "as long as there was a waterproof felt edge" well, hopefully the attached images will work and show that they have left these felt support trays which I guess hope to help the water run into the gutter and make up for the lack of any tile overhang across the first part of the gutter in most areas, but it seems that only on one side of the roof the felt is on top of these trays (as I believe it should be) sometimes the felt is below them (?!) and sometimes in shoving the tray in (none of the trays are attached to anything, just shoved in) they seem to have shoved back and wrinkled up what remained of the existing felt so it dips and rises wrinkled back behind the tray to give water somewhere to pool(?!!). Also as the trays finish about where the tiles do due to the lack of overhang there seems to be water wicking up between tray and tile (after a shower, push the tray down a little to break the gap and water pours out) and as the second image should show there's little on no overlap of the trays so water doesn't have to work hard to find a route to bypass the run to the gutter. Starting to feel the lack of ventilation with this fitting is the least of my problems...