Midland Lead Code 4 Roofing Lead Flashing Roll is a premium cast lead sheet made to BBA quality approval (BBA 86/1764) and is the ideal material to use for flashings and weatherproofing. Lead is highly resistant to corrosion and fully malleable, which makes it easy to use and ideal as a weatherproofing material. Also, because lead is heavy, it doesn’t run the risk of lifting in high winds - unlike its non-lead alternatives.