On Fri, 4 Jan 2013 02:12:50 -0800 (PST), harry
wrote:

On Jan 4, 2:21*am, Tegger wrote:
wrote in news:b8fbe895bc7bb68d5b7bvgm2hkhpbltboq@
4ax.com:

While searching the web for truss related things, I found this article
(PDF). *I was not aware of this problem, but it makes sense. *These
trusses are used in most large barns these days. *What is happening is
the moisture from animals, and ammonia from the manure is building up on
the truss plate connectors and causing them to corrode. *This could
cause the building to collapse. *I thought I'd share the article.

http://www.omafra.gov.on.ca/english/...cts/10-071.pdf

Upon reading this article, it appears to me that the problem only becomes a
significant one if solar panels are to be mounted to the roof.

--
Tegger

Are you really that dopey?
That IS where the problem came to light.

A lot of agricultural trusses around here have plywood gussets
fastened with hot dipped galvanized nails and glue in place of the
porcupine plates.