slate overhang distance on lead valley?

I have had to remove enough slates to have one of my lead valleys releaded. I have managed to remove most slates without damage and I am hoping to put them back in the same place!

There isnt any reason this shouldnt work really is there?

What is the correct overhang distance for a traditional slate roof? House is in Scotland done with Welsh slate on sarking boards.

Thanks

 

2 INCH M8

 

Number the slates bottom to top left and right, remove in sequence keeping breakages in the pile to replace.

 

Don't forget to turn the lead back on itself at the edge under the slates.

 

Plumber did that so Im ready to slate.

Ive read some valley edges were bedded with mortar and when removing them I did see some mortar in places but not everywhere!

Would this have been used to level the last slates next to the valley to make up for any discrepencys with the sarking?

Thanks

 

Slate and lead aint that grippy, adding to the thermal reaction, hence the missing mortar.

 

so are you saying it would have all been bedded with mortar?

Once the sarking was laid and the wooden valleys batons fixed, the plumber would have laid all the lead valleys. Final would have been the slater. So did they use mortar to get rid of any uneveness or are you saying they would have put a line of mortar all the way down the valley edge as a matter of course?

So I need to put back a bed of mortar down the side of the valley?

Thanks

 

They may do things a bit different in Scotland, but I have never seen cement used with lead valleys. The bits you saw may have been the original torching.

 

They used to bed the Valleys,verges,eaves and tapper (top course) in a lime mortar horse hair mix.
Over the years this practice has mostly died out replaced by more robust mechanical fixings.

catad..The majority of slated roofs this side of the border are nailed straight onto sarking boards..no torching.

 

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