concerete mix under concerete roof tile slides into lead canyon causing roof leak

[kez1]

Recommendations for what to push into there that will not eventually slide out again
Probarly have to remove existing mortar and re-do, but may be not..
Perhaps put something in there that is more flexible, sticky, and won't slide out with small building movement, causing leak.

See photos.

Thanks

 

[datarebal]

the tiles are bedded directly onto the lead which is wrong and destined to failure as you can see.
Problem is not so much building movement but expansion and contraction of the lead .
the tiles should be bedded onto an undercloak of slate or similar keeping the lead free to move.
That aside if the lead was fitted correctly you could remove the mortar and the the roof should still be weather proof..
look into it more

 

[catlad]

Depending how far you want to take it ? you can use a closed fibreglass valley.

 

[datarebal]

That's the simplest mortar free solution
But all the tiles will need recutting.

 

[noseall]

Depending how far you want to take it ? you can use a closed fibreglass valley.

Deffo.
I'd bite the bullet and go for a dry valley. Look at the availability of those Marley 'Wessex' tiles and proceed from there. If they are easily available in your area then rip the lot out and go for a dry valley.

 

[kez1]

Found this

Good to know tile type, Marley 'Wessex'
https://www.roofingsuperstore.co.uk...mO2MJadctJPAMi670isjxu2xb-UFaqIAaAhKGEALw_wcB

GRP dry valley would definately fix this.
Don't have the time to do this at moment.
Argee that common sense says lead should run all the way back, but it does not appear to do so hence the leaking. Not the first time there has been a leak here either. Have replaced 'dropped' / sliding mortar before.
Going to have a good look at this sometime over the next week or so.
With the recent thunder storm, and sun expansion on the lead - thanks for the explanation - it came into the house in torrents the other day.
jumped up there and pushed the mortar back which has achieved temporary fix for now.
If anyone has ideas other than dry valley, which is quite a long job, I can't do at the moment, then please offer up
cheers

 

[noseall]

Dry valleys are an absolute boon. You need to prepare the valley area, i.e. the gaps between the rafters need filling...…

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450mm x 4500mm soaker (second image) at the bottom and a lead saddle at the ridge.

 

[datarebal]

Ideal fir DIY, but you should make sure the lead saddle at the bottom is big enough to allow the edges to be turn up to prevent ingress once the underlay has rotted.