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The material that is used for flashing needs to be malleable,
so that it can be formed around the different contours of the roof.
This is where lead has proven the best, it can be formed easily into complicated shapes without tearing.
Wiki User
∙ 16y ago
Wiki User
∙ 13y agoBecause copper out lasts paper, even bitumen 15# felt
Wiki User
∙ 13y agoit is used for roofs because it doesn't rust like iron.
Wiki User
∙ 9y agoLead is used in roofing because it is waterproof. Lead is an excellent sealant and is used because it is cheap.
Wiki User
∙ 9y agoBecause it's easy to work with, and it's weather proof. (The lead forms a patina when exposed to the elements that seals it in, so it won't leach lead into the groundwater.)
Wiki User
∙ 15y agoIt is highly resistant to corrosion.
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