Slate overlap with valley

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Dear Experts,

[Edit: photo wouldn't upload for some reason, so here's a link:]

Image of lead valley and adjacent slates

The photo shows a lead valley where a dormer meets the main roof.

It has been suggested to us that the slates should extend further over the lead, and the current construction is "not normal". We have a quote for replacing the adjacent tiles with wider ones.

We've never had any leaks here, and I think this construction is unchanged from when the current roof was installed in the 1980s. (The building is much older.)

Any thoughts?

Thanks, Phil.
 
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With the slates in.place one can not see how much lap over the lead there is . Nor can you tell how the checks are formed . Nice slate by the way
do you have any other images?
 
I do have some more images but that is the best.

The claim is that the bead is visible and it shouldn't be, and that the slates should extend to almost meet in the middle of the valley so that not much of the lead is visible. I take "bead" to mean a cement layer joining the slates and lead, right?
 
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If it ain't broke why fix it?
The argument is, it could be “fixed” now while we have scaffolding up for other work.

Doing it later would require spending X thousand for scaffolding again.
 
If we were to slate that valley we would bring the slates further past the tilt fillet.

The way it is done now is the way it was commonly done and was generally fine.

In truth I would be tempted to have it redone while the scaffolding is done to reduce future costs.

It may be that the Lead needs to be changed at the same time.

Slates should never be bedded on to Lead, as the mortar would fall out as the Lead expands and contracts.
 
Who ever claims that doesn't know what they are seeing .. they just think they do
It's fine
 

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