On Thu, 17 Sep 2009 00:09:07 +0000, Tegger wrote:
From the Gold Coat FAQ:
"In the past few years, the manufactures of wood preservative chemicals
changed the formulations they use for most residential and commercial
applications. New formulations, including ACQ and copper azole, contain
more copper than the historically used CCA. Because dissimilar metals will
react with each other, the increase in copper content has created a more
corrosive environment for the steel in the structural connectors and
fasteners."

Interesting!

After some googling, it sounds like stainless is the best solution,
followed by 'hot dipped' fasteners (and I've actually got some hot dipped
staples on the shelf which do indeed say they're OK for PT-lumber).

I'll have to see if any of the local supply places have something suitable
later on today...

(some sites do seem to suggest that the corrosion's such a slow process
that it's not a big deal to use 'regular' fasteners in anything
non-structural, and to just replace as/when/if needed, but I think I'd
rather do things properly from the outset)

cheers

Jules

Jules | 2009-09-17 | 7:35:20 AM wrote:

(some sites do seem to suggest that the corrosion's such a slow
process that it's not a big deal to use 'regular' fasteners in
anything non-structural, and to just replace as/when/if needed, but I
think I'd rather do things properly from the outset)

It's not always a slow process. I've seen drywall screws go in a year
or two. Of course, using drywall screws in lumber is dumb, but lots of
people do it. I've seen regular screws that didn't last but a few years.

And the regular screws stain the wood.

--
Steve Bell
New Life Home Improvement
Arlington, TX USA

on 9/17/2009 10:04 AM (ET) SteveBell wrote the following:
Jules | 2009-09-17 | 7:35:20 AM wrote:


(some sites do seem to suggest that the corrosion's such a slow
process that it's not a big deal to use 'regular' fasteners in
anything non-structural, and to just replace as/when/if needed, but I
think I'd rather do things properly from the outset)


It's not always a slow process. I've seen drywall screws go in a year
or two. Of course, using drywall screws in lumber is dumb, but lots of
people do it. I've seen regular screws that didn't last but a few years.


....and the heads can break off when trying to replace them.
And the regular screws stain the wood.





--

Bill
In Hamptonburgh, NY
In the original Orange County. Est. 1683
To email, remove the double zeroes after @

In article . com,
says...
On Thu, 17 Sep 2009 00:09:07 +0000, Tegger wrote:
From the Gold Coat FAQ:
"In the past few years, the manufactures of wood preservative chemicals
changed the formulations they use for most residential and commercial
applications. New formulations, including ACQ and copper azole, contain
more copper than the historically used CCA. Because dissimilar metals will
react with each other, the increase in copper content has created a more
corrosive environment for the steel in the structural connectors and
fasteners."

Interesting!

After some googling, it sounds like stainless is the best solution,
followed by 'hot dipped' fasteners (and I've actually got some hot dipped
staples on the shelf which do indeed say they're OK for PT-lumber).

I'll have to see if any of the local supply places have something suitable
later on today...

(some sites do seem to suggest that the corrosion's such a slow process
that it's not a big deal to use 'regular' fasteners in anything
non-structural, and to just replace as/when/if needed, but I think I'd
rather do things properly from the outset)


We just replaced the aluminum cladding on several 6x6 porch posts for a
customer. They were wrapped in the aluminum coil stock that is not painted on
the inside, just a mill finish. They had terrible blisters completely through
the cladding in less than 4 years.


--
Dennis