Is cement flashing to cover soakers correct?

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19 Oct 2024
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My slate roof has just been redone, looks like quality work by competent roofer but I am worried about the abutment flashing where my roof meets the next house's wall. He installed lead soakers at the abutment (which I think is right) but covered them with cement. I asked about lead flashing instead but he said because the abutment wall is rendered, cement flashing was proper. I am concerned about durability. How long will the cement last before cracking? Should I insist on lead? I assume that will come with significant extra cost which will be a challenge, so if the cement will last more than 5 years I'll take it. Adding a photo from last week that shows the soakers underneath, but the work is now fully completed, and the soakers fully "flashed" in cement.
 

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There should be a vertical stop end to the render and only a small portion of the flashing covered.

As it is, there is a big risk of that render detaching due to expansion of the metal flashing.

Either way, it looks like building sand has been used and that's bad if so
 

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