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RE: ACZA treated wood

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The April 2004 issue of Structural Engineer magazine had a good pair of
articles on this subject under the heading: "Corrosive Conundrum, The
Unintended Risks of Eliminating Harmful Wood Preservatives". One article
recommends hot-dip galvanized steel with extra thickness of galvanizing
(G185) or stainless steel for fasteners and connectors. It states that CCA
treated wood is approximately twice as corrosive as untreated wood and the
new preservatives are approximately twice as corrosive as CCA (or 4 times as
corrosive as untreated wood). 

William C. Sherman, PE
(Bill Sherman)
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)

-----Original Message-----
From: Casano, Karen [mailto:Karen.Casano(--nospam--at)] 
Sent: Tuesday, June 08, 2004 10:29 AM
To: 'seaint(--nospam--at)'
Subject: ACZA treated wood

I am looking for informed advice about fasteners in ACZA treated wood.  I
was aware that the CBC requires nails to be corrosion resistant in all
treated lumber, but I had never considered the anchor bolts and other
fasteners (light gauge connectors also).  I don't see where anchor bolts are
exempted from this requirement.  The most recent Simpson catalog recommends
that only stainless steel fasteners be in contact with ACZA lumber.  I have
done some web searching and found two manufacturers of ACZA treated lumber -
one of which suggests that Simpson's research was limited and that G90
hot-dipped steel is fine in ACZA, and the other suggests that even mild
steel is ok in ACZA.  I have discovered that my local lumber supplier stocks
the ACZA treated wood for the larger pieces (3x8 for the top of a foundation
wall). I also found a lumber supplier's website that suggested that the IRC
exempts ½ or larger bolts from this requirement.

I'm curious about how others are dealing with this for nails, screws, anchor
bolts, plate washers, other structural steel connectors and light gauge
timber connectors.  

Karen E. Casano, SE
San Diego

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