Silicone & lead ?

[Rick Hughes]

had to replace a busted tile on bay window roof ... and the lead flashing split (ripped) when lifted.

The part I needed to lift eased it up gently - no problem, it was 2 foot away that split from free edge right up to where the vert upstand starts. Must have been a fracture point there. Replaced tile and folded lead back down ... all invisible ... but obvioulsy I need to put a fix in place.

As top horizontal edge is embedded in brickwork, not easy (or neat) to replace.

Thought is if I take a 12" wide piece of lead, and slide it in under where it is split, that solves tehe issue, but how do I keep it there ... don't want the plug-ugly way of lead strips wrappped over.

Thought 2 options ..

# coat the 'patch piece' with liquid bitumen, put it in place and dress original lead down on top of it ...

Bitumen on top face of patch so it 'glues lead to lead'

# put some silcone on top face of patch to use as glue, and dress down as above

thoughts ?

[The Natural Philosopher]

cold weather shrinks lead and can split it. I would NOT attach it to existing part or at least not on both side of the split.

Car body filler would be my glue of choice.

[Rick Hughes]

I could attach it to the tiles underneath ... so tile - glue - lead patch - flashing. So flashing would slide over lead patch if it needed to move.

[Caecilius]

That sounds like a bad idea to me.

I'd worry about the effects of the acetic acid on the lead amoungs other things. I think it will corrode it, as lead + acetic acid = lead acetate.

[Mark]

This works fine as a temporary repair,

Lead Sheet Sealant

code 55908 and yes it is a "silicone" sealent

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[Steve Firth]

Rick Hughes wrote: [snip]