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Jam Lady
Joined: 28 Dec 2006 Posts: 2571 Location: New Jersey, USA
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Mistress Rose
Joined: 21 Jul 2011 Posts: 15972
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Slim
Joined: 05 Mar 2006 Posts: 6612 Location: New England (In the US of A)
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dpack
Joined: 02 Jul 2005 Posts: 46219 Location: yes
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Posted: Sun Aug 04, 24 12:27 pm Post subject: |
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the reason lead lasts for 500 yrs as a roof is that as soon as it patinas it is very stable re chemical erosion to solution etc
smelter fumes/waste, paint flakes and tetra from "cheap"petrol are more disturbing
i was out and about, we went to see a roman bridge, we found the remains of some big stone work, 1800 yrs later the lead that had embedded the long gone the bronze or iron spikes that added resilience to the masonry looked like new
for a roman bridge, buried near a river, dug up and brushed as a historic site to display, left for 20 yrs it seems a stable choice of material
soluble salt are well nasty, as a metal it is safer than many things(ballistics aside)
lead shot is bad, birds think it grit and digestive acids do the rest
i have an ornamental in sheet lead, very stable over 30 yrs of being weathered etc
the usa is a bit ott re lead as a metal for construction, we are rather harsh on log "cabins " |
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Mistress Rose
Joined: 21 Jul 2011 Posts: 15972
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