Corroded lead flashing from condensation

26 Aug 2016
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United Kingdom
Hi all hope you're well

I've just taken the lead off our flat to pitched roof drip and it's a right state underneath after 5 years.
This is because the flat roof deck is impermeable so any condensation will form on the cold lead as it goes underneath it.
It's a cold roof above the loft storage.

What is the best practice for preventing this when the new lead goes down?

I've read about chalk emulsion but it doesn't look like something readily available.
Thanks in advance.

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