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Repair to cracked lead gully
Anonymous user 09/03/2024 - 3.34 PM
Hi, I have two slate roofs that run next to each other with a shallow gulley running between them. The gully is about 3.5m to 4m long and with a very shallow slope to it. Following a leak I am told that there is a crack about half way down the gully running across it, not down the length of it. I am told that it is a stress crack from seasonal expansion and contraction due to it being installed in one long length, which I have no reason to doubt. It's certainly older than 25 years (when I moved in) and could be much older but the lead appears to be in good condition still except for the crack. It's an old house from the 1860s and has a small amount of seasonal movement. I've had a couple of roofers look at it. The first wanted to install a new GRP gully but a building surveyor, that I had previously had round to inspect a few other things, recommended that I don't install GRP as it is inflexible with the movement of the house. The second roofer suggested his preferred option would be to remove the slate either side of the crack, clean and abrade the lead and then fit a 2 part polymer rubber seal. Then replace the slates. Can someone please explain this to me, how it works and how long it would be reasonably expected to last. (He said the ideal way would be to install new lead in 2 shorter lengths with a step in the valley to allow movement but that would require significant modifications to the valley and a lot of work. The rubber seal, therefore probably being the best option) I have no reason to doubt the advice but it's always good to have a second opinion so I would appreciate it if you could share your thoughts. Many thanks. Paul.
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Anonymous user
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