For roofing, lead provides a number of benefits. Its malleability and flexibility make it simple to work around specific roofing elements. This characteristic indicates that it is resistant to changes in temperature. Unlike many other materials, it is unlikely to crack since it easily expands in hot weather and contracts in cold weather.
Lead is a very hazardous metal that can impair a child's growth as well as cause major health issues. However, touching lead or inhaling lead dust typically poses the greatest risk. The risk is virtually nonexistent because your lead roofing is located so far above you.
A more severe issue is that rain from your roof's runoff can corrode and taint the lead. As long as the run-off is directed properly into the drains, this shouldn't be an issue, but if your roof is made of lead, you should avoid utilising run-off water in the garden.