How tightly should lead flashing be dressed to a NOT flat old stone wall?

[DIYNotIan]

Hi all

I've finished installed soakers to my slate roof at a wall abutment, and I've cut the chase above ready for the flashing. The chase isn't mega straight, especially the bottom line This is mostly due to bits of stone and mortar falling away. And partly lack of skill On top of that, the vertical bit of wall that will be behind the flashing undulates and is anything but flat.

I've dressed the soaker upstands tight to the wall. Should I do the same with the flashing or does it not need to be dressed so tightly?

Also, I was planning to keep the bottom of the flashing about 10mm above the slates. The upstand would then be around 115mm, with 35mm tucked into the chase. Where the chase is lower than 115mm, does it matter? IE - with the lead at 115mm upstand, but the bottom line of the chase only 100mm, there will be a small void behind the lead. Is that ok as is? Or should I look to pack it somehow?

I hope this all makes sense! It's been a long day. I'll try and add some photos shortly.

Any advice much appreciated.

Many thanks

 

[DIYNotIan]

Here's some photos as promised.... Click on them to see them larger. Cheers