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Re: Galvanized bolts req'd in PT wood?

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I share your interpretation as well and do not think it applies to anchor bolts as pressure treatment does not usually occur through the entire thickness of the plate. 
(not to mention the holes are larger than the bolt...technically not in direct contact)   However.....when the building dept./and/or inpsectors are adamant, I have told the contractor to wipe the bolts with solvent and usuallly has done the trick...

----- Original Message -----
From: "Gould, Diane"
To: seaint(--nospam--at)
Subject: Galvanized bolts req'd in PT wood?
Date: Thu, 4 Sep 2008 15:29:19 -0700

2007 CBC/2006 IBC Section 2304.9.5 states that ?fasteners? for PT & fire-retardant wood shall be galvanized, stainless, silicon bronze, or copper.  2001 CBC/2000 UBC Section 2304.3 also stipulated this requirement.  On a wood-frame job currently in construction, we have pressure-treated sill plates and the inspector is saying that galvanized anchor bolts (sill bolts and hold-down bolts) are a ?code requirement?.


I understand the new preservatives can be much more corrosive than the old stuff, but was of the impression that bolts are of a large-enough diameter to not pose a concern.  I had thought I read that somewhere but I cannot find any published code language, commentary, or interpretations to support this position.  Also, I started thinking, what about the washer?  Is that a ?fastener??  It?s in contact with the PT wood - does that mean it needs to be galvanized too?  I could not find a definition of ?fastener? in the CBC/IBC.


I?ve been away from wood design for awhile and am feeling a little rusty, so I?m hoping someone can give me some guidance on this. 


Thanks in advance,



Diane C. Gould, S.E.

Senior Structural Engineer


Design Services Section

707 Third Street, Suite 4-105

West Sacramento, CA 95605

(916) 375-4219 phone

(916) 375-4916 fax




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