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Posted by James on May 8, 2006, 8:46 pm
I am going to be building a woodshed next month. The primary stucture will
be pressure treated 4 X 6's, and the exterior will be covered with rough
sawn cedar. This woodshed will be built on skids, so that I could move it
a bit in the future if needed.
Here are my questions:
What are the best nails to use (type, and size ??)
I know with the new p-t wood, you are not supposed to use the regular
galvanized nails. Is double hot-dipped galvanized ok ? Isn't
stainless steel a bit of overkill? What about those coated nails ? Are
they good for the new p-t lumber ?
I will be doing some bracing, to give lateral stability, etc. Is it best
to use nails, or lag screws ?? If lag screws, what type and size would be
good ??
On some things that I have built before and that were touching the ground
or laying on the ground, I would use either .4 or .6 retention.
Does the new p-t wood have similar values ? What rating should I use on the
skids, that will always be in contact with the ground ?
Is it essential to apply preservative to any ends that I cut ?? If so,
what is a common name of this product ?
I know these are all very green questions, but I will enjoy and learn from
the responses.
Thank you !!!!!!!
--james--
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Posted by Bob Morrison on May 8, 2006, 9:36 pm
In a previous post James wrote...
> I am going to be building a woodshed next month. The primary stucture will
> be pressure treated 4 X 6's, and the exterior will be covered with rough
> sawn cedar. This woodshed will be built on skids, so that I could move it
> a bit in the future if needed.
>
James:
Here's some stuff from my standard structural notes:
Members in contact with concrete or ground (mud sill) shall be pressure
treated per AWPA C2 with a water-born treatment to a minimum retention of
0.40 pcf.
Pressure Treatment - AWPA Treatment C2, for fresh water use, ACQ, ACZA or
ACA, minimum retention = 0.60 lb/cu. ft.
---> Comment: If you can find it go for the heavier treatment
Above ground members exposed to weather (deck) shall be pressure treated
per AWPA C2 to a retention of 0.25 pcf. Embedded poles shall be pressure
treated per AWPA C23 for round poles to a retention of 0.60 pcf and AWPA
C24 for sawn poles to a retention of 0.80 pcf. Cuts and Holes in all
pressure treated members shall be treated after fabrication with 2% Copper
Napthenate in accordance with AWPA M4.
Connectors and fasteners for pressure treated wood shall be hot-dipped
galvanized or stainless steel in accordance with IBC Section 2304.9.5.
Hope that helps!
--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com
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Posted by James on May 8, 2006, 10:36 pm
Thanks for all the helpful replies. I am making notes.
I assume from Bob's post, that the (newer) p-t lumber still has the
retention ratings of things like .40 , .60 etc etc.
On the poster who asked what is the "new" p-t wood, I am talking about the
p-t process they use now that has a greater content of copper, and will
corrode regular galvanized nails. I think they started this new stuff about
two years ago.
What is a "star drive lag" ??
Thanks again guys !!!
--James--
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Posted by Al Bundy on May 8, 2006, 11:15 pm
> Thanks for all the helpful replies. I am making notes.
>
> I assume from Bob's post, that the (newer) p-t lumber still has the
> retention ratings of things like .40 , .60 etc etc.
>
> On the poster who asked what is the "new" p-t wood, I am talking
> about the p-t process they use now that has a greater content of
> copper, and will corrode regular galvanized nails. I think they
> started this new stuff about two years ago.
>
> What is a "star drive lag" ??
>
> Thanks again guys !!!
>
> --James--
>
>
> a greater content of copper, and will corrode regular galvanized nails.
> I think they started this new stuff about two years ago.
Is this all PT lumber now? If not, how is the "new" stuff ID'd?
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Posted by Bob Morrison on May 9, 2006, 12:00 am
In a previous post Al Bundy wrote...
> Is this all PT lumber now? If not, how is the "new" stuff ID'd?
>
Should be a tag on the end with the type of treatment, chemicals used, and
the amount of chemical penetration.
--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com
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