PVC/galvanized

John Cropper j.cropper at trinidad.net
Thu Dec 13 22:19:41 EST 2001


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----- Original Message -----
From: "Lawrence F. London, Jr." <lflondon at mindspring.com>
Newsgroups: permaculture
To: "permaculture" <permaculture at franklin.oit.unc.edu>
Sent: Tuesday, December 11, 2001 17:10
Subject: Re: PVC/galvanized


> On 11 Dec 2001 04:22:03 -0800, Michael Dean
> <mikedean.com at altavista.com> wrote:
>
> >Can somebody explain to me why --"Never use lead head nails as fasteners
on such a roof; alternatives: stainless steel screws, also galvanized screws
and nails with neoprene washers"
>
> Lead-head nails are galvanized ring-shank roofing nails with lead caps
> surrounding the smaller galvanized steel heads on the nails. When you
> nail your 5-V roofing panels to your skip sheathing or plywood decking
> you'll nail into the inner of the two outside ridges of the panels.
> The lead head is forced onto and into the hole made by the nail thus
> preventing water from getting in. Over time the lead will leach out
> into the water running off the roof and into your cistern. Doubt you'd
> want to drink that under any circumstances, though many have over the
> years.
>
>
>
> L.F.London ICQ#27930345 lflondon at mindspring.com
> http://www.ibiblio.org/ecolandtech  london at ibiblio.org
>
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