Lead flashing into flint wall?

30 Aug 2012
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United Kingdom

I'm currently having a single-storey, pitched roof extension built on the back of my flint-walled house. Obviously the normal way to waterproof the section where the roof meets the wall would be to cut into the wall and insert lead flashing. But my wall is flint and very lumpy. A cement fillet would be easy, but very prone to cracking.

Cutting a groove into the wall (through the flints) to insert some lead would be the ideal solution - but is this even possible?

Any thoughts/advice would be greatly appreciated!

- Paul
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Flint is really hard to cut into, although there are some diamond ringsaws that will do it. If you don't want a cement fillet it may be a case of removing some of the flints to insert the flashing and rebuilding them in.

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