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dpack

Joined: 02 Jul 2005
Posts: 46247
Location: yes

Posted: Mon May 10, 21 6:25 pm Post subject:
umm maybe light is good i thought that was a wall

Slim

Joined: 05 Mar 2006
Posts: 6612
Location: New England (In the US of A)

Posted: Mon May 10, 21 6:52 pm Post subject:
I'm still floored by the fact that y'all continue to use actual lead.

sean
Downsizer Moderator

Joined: 28 Oct 2004
Posts: 42219
Location: North Devon

Posted: Mon May 10, 21 7:31 pm Post subject:

Slim wrote:

I'm still floored by the fact that y'all continue to use actual lead.

Better than putting it in petrol which we used to do. Is using it for flashing etc a serious problem? (Genuine question, I have no idea.)

Slim

Joined: 05 Mar 2006
Posts: 6612
Location: New England (In the US of A)

Posted: Mon May 10, 21 9:57 pm Post subject:
Well the flakes from lead paint are a huge problem in urban areas here. Some very contaminated soils that get ingested in several ways. No idea how much goes from flashing to soil, but I'm sure acid rain must pull some amount of lead into the soil & waterways each time it rains...

Nick

Joined: 02 Nov 2004
Posts: 34535
Location: Hereford

Posted: Tue May 11, 21 5:27 am Post subject:
https://www.researchgate.net/publication/261721211_Influence_of_roofing_materials_and_lead_flashing_on_rainwater_tank_contamination_by_metals

sgt.colon

Joined: 27 Jul 2009
Posts: 7380
Location: Just south of north.

Posted: Tue May 11, 21 7:46 am Post subject:
That is look really good Nick. I thought you were building yourself an outdoor bar.

Mistress Rose

Joined: 21 Jul 2011
Posts: 15997

Posted: Tue May 11, 21 7:52 am Post subject:
Lead is used as it has a lot of useful attributes. The other thing is that a lot of houses in the UK were built with either lead gullies or lead flashing because of their age, and the lead is still in reasonable condition, so has never been changed.

dpack

Joined: 02 Jul 2005
Posts: 46247
Location: yes

Posted: Tue May 11, 21 8:21 am Post subject:
it has bad points when used badly, for flexible long-lasting and waterproof it is hard to beat paint and organic for petrol is a whole different world of brain damage to sheet stopping drips not ideal for water supplies though

Slim

Joined: 05 Mar 2006
Posts: 6612
Location: New England (In the US of A)

Posted: Tue May 11, 21 9:13 am Post subject:

We just use aluminum flashing here, or copper if you've got the $$$.
Lead may be easier, but is it really "better" enough to make it worth using?
If it leaches into rainwater collection than it's leaching into everything downstream of the roof....
Lead to soil into veg is one transmission path, but more worrying is lead to soil to "dirt"/dust, into the house and on surfaces and then ingested/inhaler. I'm intrigued by microdosing, but not of heavy metals...

dpack

Joined: 02 Jul 2005
Posts: 46247
Location: yes

Posted: Tue May 11, 21 9:41 am Post subject:

copper can have issues depending on environment

tar covered tarp is a green option, the shed roof has lasted a few years

a good lead roof will stop shedding anything significant after a few decades and will last centuries

4 to 5 hundred years is considered a decent performance, the lead to lead welds do suffer a bit of metal fatigue over a few hundred years

dressed and welded lead over an oak carcase has been known to last nearly twice that

one of the best bits of lead work, and lead, i have ever seen was roman

bridge footings, big blocks of stone, fastened together with iron staples that were hot leaded into the holes
the iron was gone after a few river twists, entombment and excavation but the lead was in perfect condition after 1700 years in a river or buried near a river

ace trade craft by the builder mason fabrication crew, stunning material quality, pity about all the dead slaves who dug and refined it(mostly to extract the silver for Caesar, lead was pretty much a waste product but could be used well or not)
bit nuanced.

Slim

Joined: 05 Mar 2006
Posts: 6612
Location: New England (In the US of A)

Posted: Tue May 11, 21 9:44 am Post subject:
Why will a lead roof eventually stop leaching lead?

dpack

Joined: 02 Jul 2005
Posts: 46247
Location: yes

Posted: Tue May 11, 21 9:55 am Post subject:
ps naughty but i tried the roman lead with a thumbnail, fresh and soft as a toxic daisy and ready to work after 1700+ yrs if it was eroding and ablating chemically i would not have met that bit of history ps the river is peat hill fed and probably has a low Ph as a usual thing treating any lead , metal or compound as toxic is sensible

dpack

Joined: 02 Jul 2005
Posts: 46247
Location: yes

Posted: Tue May 11, 21 10:26 am Post subject:

Slim wrote:

Why will a lead roof eventually stop leaching lead?

the weathered patina becomes a non-soluble layer on the surface, i am not sure of the chemistry, complex i suspect as a good surface takes a bluish tinge rather than silver or (ugggh) white fluffy one

i have an arty bit outside that i made from offcuts about 1995, even though it has been indoors for half of that time it has almost shed the "dandruff" and developed a grey blue patina
with no accidents it is probably permanent in the world

the surface layer becomes not soluble compounds that resist further chemical changes as they are fairly stable to "normal" conditions

complicated but a similar thing to very reactive metals being stable as the surface reacted and the inside has a shell

Nick

Joined: 02 Nov 2004
Posts: 34535
Location: Hereford

Posted: Tue May 11, 21 5:27 pm Post subject:

sgt.colon wrote:

That is look really good Nick.

I thought you were building yourself an outdoor bar.

No.

. But I bet I can sit in it with a drink eventually.

Treacodactyl
Downsizer Moderator

Joined: 28 Oct 2004
Posts: 25795
Location: Jumping on the bandwagon of opportunism

Posted: Tue May 11, 21 6:06 pm Post subject:

Nick wrote:

sgt.colon wrote:

That is look really good Nick.

I thought you were building yourself an outdoor bar.

No.

. But I bet I can sit in it with a drink eventually.

In an antique pewter tankard?

Porch is looking good, it's almost inspiring me to make something out of the oak I've got laying around. (Although it is still in a fallen trunk laying in my woodland...)

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