Return to index: [Subject] [Thread] [Date] [Author]

Wood-frame construction: Life in the real world

[Subject Prev][Subject Next][Thread Prev][Thread Next]
The latest from my ongoing remodeling project:

Pressure-treated sill stock:
Wood treated with Ammonium Copper Quat (ACQ), Copper Azole (CA) and
Ammoniacal Copper Zinc Arsenate (ACZA) is not suitable for use with plain
steel or "regular" galvanized fasteners because the copper attacks the steel
very aggressively.  Borate-treated lumber appears not to corrode fasteners
appreciably.  Knowing this, I told my contractor to use borate-treated sill
stock.  He called his supplier and was informed that this would take an
extra week as a special order.  No problem--we wait a week for the lumber
delivery.  What should appear but Copper Azole treated wood??  The entire
lumber supply chain immediately became suspect.  The lumber yard did not
know (or care) how to tell the difference in treatment chemicals, and their
supplier didn't either.  But at least now the contractor does, because I
showed him what to look for on the little plastic tags that are stapled to
the end of each piece of PT lumber.  (Hint:  Look for the initials listed at
the beginning of this paragraph.)  When I went to another lumber yard to get
borate treated lumber, I found that it does NOT have those little tags on
it--I assume because it is not toxic to humans and the EPA does not regulate
it (?)

Simpson/USP/KC Metals straps:
A few years ago Simpson realized that 16-penny common nails were not readily
available (only a decade or two after this was the case....) and came out
with their "MSTC" series of straps.  Their MST  (without the "C") series
calls for 16-penny
commons to achieve full catalog values--the MSTC straps are intended to use
16-penny sinkers.  Great idea.  I called or visited four major lumber yards
in my area, in addition to two Home Depots.  None of them carry the MSTC
straps--they all carry the old MST straps.  Not wanting to pound dozens of
full-length 16-penny commons into both sides of a 4x6 from the MST straps
(which don't have nearly as good a staggering pattern for the nails) I
looked for Simpson "N16" nails (0.162" x 2-1/2").  I asked at two yards;  I
found clones of the N16's at one yard;  I found 16-penny commons at another
yard.   The question is:  are the contractors buying the 0.162 inch diameter
required for these archaic straps?  I know what the overwhelming answer
would be in  MY  area!

It's always interesting to see whats happening outside of the office and the
manufacturers catalogs.  When you get some spare time, try calling around to
see if the stuff you commonly specify on your drawings is readily available.
You might be surprised.


******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at:
*   This email was sent to you via Structural Engineers 
*   Association of Southern California (SEAOSC) server. To 
*   subscribe (no fee) or UnSubscribe, please go to:
*   Questions to seaint-ad(--nospam--at) Remember, any email you 
*   send to the list is public domain and may be re-posted 
*   without your permission. Make sure you visit our web 
*   site at: 
******* ****** ****** ****** ******* ****** ****** ********