I need to re-point some lead flashing with Lead Mate as there's movement which has cracked the mortar. Its a wide joint (old, cheap Victorian house) - 25mm plus. The makers recommend the depth of Lead Mate should be only half the width. But raking out the old pointing leaves a depth of 25mm or more. What can I pack this with to make the joint shallower before using the Lead mate pl?
Personally, I wouldn't bother with the Lead Mate, and just use lime mortar for all the re-pointing. If you have some to hand, you could use that.
How long is the flashing? I'd be a *bit* concerned about the structural integrity of the wall with a long deep slice raked out of it. Filling the rake with flexible sealant doesn't strike me as providing much strength, so I would want some sort of mortar. (and I'm a great believer in not using cement mortar on lime-mortared walls).
It's the parapet wall above the join between the two sides of the rear extension: 7m long* by 3 courses plus capping stone high (except around the chimney stack which has been reduced to 7 courses plus flaunching).
I take the point about lime mortar but I doubt that'd have enough flexibility to cope with the seasonal movement we are getting - quite possibly adding to the inevitable differential thermal movement. (There's also longer term movement - ie subsidence - but that's another and of course bigger problem.)
*not 7m of continuous lead of course: that was done in sections of less than 1500mmHomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.