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Posted by RicodJour on October 26, 2006, 9:28 am
Rudy wrote:
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> What if they're using "cement coated" nails ? Will that protect the metal
> from the ACQ ?
The cement coating is an adhesive and not designed as a protective
coating. Will it help extend the life of the nails? Possibly - but
possibly is not a desirable result in structural engineering circles.
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Posted by Wayne Whitney on October 26, 2006, 12:01 pm
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> In a previous post marson wrote...
> > If hot dipped galvanized fasteners are needed in nailing into the
> > bottom plate if it's ACQ treated lumber, then there are a lot of
> > builders out there in trouble. I don't know of anyone who is
> > doing that.
> Unfortunately, that is all too true. However, the bottom edge nails will
> corrode after a fairly short period of time and that nice shear wall will
> no longer be of any value.
Is this corrosion a problem only while the PT lumber is still wet from
the PT process, or does it continue to occur after the PT lumber has
dried?
I'm retrofitting shear walls on a foundation installed 2.75 years ago
with ACQ sill plates. Untreated nails that had been installed in the
sill plate over 1 year ago and recently removed show no signs of
corrosion. My work so far has been with standard nails; wondering if
I need to install SS nails between the standard nails on the sill
plate.
Cheers, Wayne
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Posted by RicodJour on October 26, 2006, 12:50 pm
Wayne Whitney wrote:
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> I'm retrofitting shear walls on a foundation installed 2.75 years ago
> with ACQ sill plates. Untreated nails that had been installed in the
> sill plate over 1 year ago and recently removed show no signs of
> corrosion. My work so far has been with standard nails; wondering if
> I need to install SS nails between the standard nails on the sill
> plate.
ACQ is relatively new territory. Wet PT lumber is far more of a
problem, but it is unclear at what rate the corrosion will proceed as
the wood dries out. Guesses don't work in structural engineering. The
few extra bucks for corrosion resistant fasteners is money well spent.
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Posted by Wayne Whitney on October 26, 2006, 1:16 pm
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> I'm retrofitting shear walls on a foundation installed 2.75 years
> ago with ACQ sill plates. Untreated nails that had been installed
> in the sill plate over 1 year ago and recently removed show no signs
> of corrosion.
After making this statement, I realized that I hadn't really been
paying attention to the nails I had been removing. So I pulled some
nails I had installed 2 years ago, 4 nails from one piece of the sill
plate and 4 nails from a cripple stud, and I took a closer look.
The nails from the cripple stud basically looked the same as unused
nails, finish wise. The nails from the sill plate did show some signs
of corrosion: the yellow/silver zinc dichromate finish was missing in
spots, anywhere from 10%-40% of the surface area of the nail, and they
all showed a few spots of brown rust at the point.
Based on this level of corrosion, if I want the nails to be
structurally sound in 50 or 100 years, do I need to use corrosion
resistant nails?
Thanks, Wayne
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Posted by Bob Morrison on October 26, 2006, 2:43 pm
In a previous post Wayne Whitney wrote...
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> Based on this level of corrosion, if I want the nails to be
> structurally sound in 50 or 100 years, do I need to use corrosion
> resistant nails?
>
Wayne:
AS I said in an earlier post: my specifications require the use of
corrosion resistant fasteners when connecting to PT lumber. So, I
recommend that you use HD galvanized nails when putting together any
pieces attached to PT lumber.
--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com
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> from the ACQ ?