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How to repair a slate roof leak.
Installing a bonding gutter this video shows a roof repair and the fitting of a bonding gutter between a slate and a tiled roof but it will also fit two slate roofs together as well.
Details are at slate roof leaks temporary repair once the necessary slates are removed the valley is usually replaced with new heavy copper or on some roofs folks use other flashing materials like aluminum i don t recommend that.
You can use either a dry bonding gutter or the standard bonding gutter.
With good wire cutters you might also be able to cut off the head of the nail which will help.
To do this use the slate ripper to rip off the nail that hooks the slate onto the slate roof.
Or see slate roof repairs for a discussion of permanent slate roof repairs rather than the leaky slate roof holding action discussed in the article above.