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Yes. The fillet is triangular in cross-section.

That's exactly how it was - a mortar fillet sitting on top of the bent lead with some mortar in the wall slot. It came apart and rain got into the slot and ran down underneath causing a bad leak into the house. I want to make sure it doesn't happen again so I'm inclined to fill the slot with...

I was the OP. The mortar fillet which failed was done in the traditional UK manner by an experienced tradesman but came adrift after only 3 years or so. The question in my mind is whether best practice nowadays would be to use a flexible mastic and protect that with a mortar fillet.

Thanks for that idea using a flexible mastic. It makes good sense. Anyone else care to comment?

Thanks for your comment. I probably didn't explain well enough. The leadwork forms part of a box gutter and the upper edge of it is slotted into the sandstone wall and then covered by a mortar fillet. I think the lead is good and slotted well enough into the wall but it's the mortar fillet above...

Hi all, I have a mortar fillet over some leadwork slotted into a sandstone wall but it has come away from the wall after a few years, probably caused by rain. Any advice on replacing the mortar fillet would be very helpful. How long should a fillet last? Thanks.