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Posted by James on June 12, 2006, 10:31 pm
Anyone have any idea of the approximate weight of a pressure-treated 4 x 6
timber, 8 ft long ?
These are treated at .40 rating. I assume they are made of yellow pine
?? I know the weight would vary by how long the posts have been outside,
asorbing air moisture, etc etc, but I am looking for an approximation, based
on posts that are 3 -4 months aged.
Thanks for any info !!
--james--
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Posted by Charles Mulks on June 13, 2006, 8:01 am
>
>
> Anyone have any idea of the approximate weight of a pressure-treated 4 x
6
> timber, 8 ft long ?
>
A dry, treated, 4x4 x 12' weighs just about 30 lbs (I have had occasion
to weigh several). A wet (soggy) one can hit 40+ lbs, easy.
4x6 x 8' = 4x4 x 12' , so your 4x6 should weigh just about the same.
A bit more precisely:
a 4x4 x 12' is actually closer to 3.5" x 3.5" x 144" = 1764 cubic inches
a 4x6 x 8' is " " " 3.5" x 5.5" x 96" = 1848 cubic inches
1848/1764 ~ 1.0476, about 4.76% larger (volumetrically)
and 1.0476 * 30 lbs ~ 31.43 lbs
>
> These are treated at .40 rating. I assume they are made of yellow pine
My 4x4's are stamped "No. 2 S-DRY RED PINE"
S-DRY doesn't seem to mean DRY
> ?? I know the weight would vary by how long the posts have been outside,
> asorbing air moisture, etc etc, but I am looking for an approximation,
based
> on posts that are 3 -4 months aged.
>
> Thanks for any info !!
>
> --james--
>
>
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Posted by RicodJour on June 13, 2006, 12:10 pm
James wrote:
> Anyone have any idea of the approximate weight of a pressure-treated 4 x 6
> timber, 8 ft long ?
>
>
> These are treated at .40 rating. I assume they are made of yellow pine
> ?? I know the weight would vary by how long the posts have been outside,
> asorbing air moisture, etc etc, but I am looking for an approximation, based
> on posts that are 3 -4 months aged.
Southern Yellow Pine weighs in at a little over 40 pounds per cubic
foot. Your 4x6 8 footer is just over a cubic foot. So an untreated
dried piece would weigh about 40-45 pounds. If it's treated and still
partially wet, you'd be looking at another 10 pounds or so.
R
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Posted by Bob on June 13, 2006, 11:28 pm
RicodJour wrote:
> James wrote:
> > Anyone have any idea of the approximate weight of a pressure-treated 4 x 6
> > timber, 8 ft long ?
> >
> >
> > These are treated at .40 rating. I assume they are made of yellow pine
> > ?? I know the weight would vary by how long the posts have been outside,
> > asorbing air moisture, etc etc, but I am looking for an approximation, based
> > on posts that are 3 -4 months aged.
>
> Southern Yellow Pine weighs in at a little over 40 pounds per cubic
> foot. Your 4x6 8 footer is just over a cubic foot. So an untreated
> dried piece would weigh about 40-45 pounds. If it's treated and still
> partially wet, you'd be looking at another 10 pounds or so.
>From my experience, very wet PT lumber almost doubles in weight.
Something to consider if weight is a factor.
Bob
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Posted by Goedjn on June 14, 2006, 10:50 am
wrote:
>
>
>Anyone have any idea of the approximate weight of a pressure-treated 4 x 6
>timber, 8 ft long ?
>
>
>These are treated at .40 rating. I assume they are made of yellow pine
>?? I know the weight would vary by how long the posts have been outside,
>asorbing air moisture, etc etc, but I am looking for an approximation, based
>on posts that are 3 -4 months aged.
>
about 70 pounds, +/- 20.
http://www.reade.com/Particle_Briefings/spec_gra2.html
says that southern yellow pine should be around 45 pounds
per cubic foot.
http://www.treatedwood.com/products/generalfaq.html
says that freshly treated wood
may have as much as 38 pounds of water per cu.ft,
which will eventually dry out leaving around
0.40 pounds per cubic foot of actual preservative.
a an 8' 4x6 is actually about 3.5 x 5.5 x 96 inches,
which works out to about 1.07 cubic feet.
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