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Old 11-16-2015, 12:42 PM   #21
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And for those that are interested, the design values (Modulus of Rupture, Modulus of Elasticity) for SYP meet or exceed Fir irregardless of the species chosen.
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Old 11-16-2015, 12:51 PM   #22
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The problem with comparing a semi trailer (van) with a car hauler is that the van never sees the elements. Also, the van trailer is looking for durability with weight savings so that the commercial driver does not haul around "empty" weight. Cottonwood is one of the lightest "hardwoods" so it makes that choice easy. It works well for a van trailer for those reasons. If you put that same cottonwood outside, it will degrade quickly, even faster than some softwoods. It is just not meant for that use.

As for the chems, the treatment chemicals used today (at least those available to Joe Busbuilder) are dependent on copper as a bacteristat (kills rot) and as a algaestat (kills mold). This is driven into the wood by the use of pressure and heat, where it bonds to the wood. The threat of leaching is very small, and the toxicity is extremely low. In fact, you get more copper exposure by rubbing around the pennies in your pocket that you probably would ever get from using pressure treated wood in a trailer setting.
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Old 11-16-2015, 01:01 PM   #23
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We don't have yellow pine here.

Again, armchair expert.

We use 20 foot scaffold planks at work. They sag 6 feet in the center without breaking. Try doing that with any other wood.

I get up to 10 years out of fir 2x6 decking. All the snow, rain, salt, ect takes it's toll.

Spruce and pine only last a few years at best in my climate.

My 01 dodge is about to get a flat deck, decked with fir.

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Old 11-16-2015, 01:08 PM   #24
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I am certain that there is some pressure treated product available at your big box store.

That will be a superior product to any untreated softwood material.

Again, I believe your anecdotal evidence, but please refer to a span table or design values before you extoll the virtues of one wood over another.

As for me being an "armchair expert" please read the first quote in your signature.
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Old 11-16-2015, 01:22 PM   #25
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https://www.lowes.ca/treated-lumber/..._g2450099.html
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Old 11-16-2015, 01:51 PM   #26
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Quote:
Originally Posted by msumoose View Post
If you put that same cottonwood outside, it will degrade quickly, even faster than some softwoods. It is just not meant for that use.
Actually, these were flat bed trailers exposed to the elements.

Beats me...I'm a coffee roaster. ;)
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Old 11-16-2015, 03:22 PM   #27
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Quote:
Originally Posted by msumoose View Post
I am certain that there is some pressure treated product available at your big box store.

That will be a superior product to any untreated softwood material.

Again, I believe your anecdotal evidence, but please refer to a span table or design values before you extoll the virtues of one wood over another.

As for me being an "armchair expert" please read the first quote in your signature.
Some folks here seem to hate anyone smarter than they are and are intimidated by your being educated and articulate.
Speaking of yellow pine, Im clearing some huge old growth long leaf.
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Old 11-17-2015, 10:52 AM   #28
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Quote:
Originally Posted by msumoose View Post
I am certain that there is some pressure treated product available at your big box store.

That will be a superior product to any untreated softwood material.

Again, I believe your anecdotal evidence, but please refer to a span table or design values before you extoll the virtues of one wood over another.

As for me being an "armchair expert" please read the first quote in your signature.
Soaking up your knowledge.. Thanks for posting.
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Old 11-17-2015, 11:59 AM   #29
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Actually, these were flat bed trailers exposed to the elements.

Beats me...I'm a coffee roaster. ;)

Wow! The only wood I have ever seen in a van or a flatbed was an oak mat. It was smaller pieces glued together to optimize yield. In fact, the wood science department that I graduated from sanded and finished it and used it for flooring in their buildings.

I have heard of apitong being used (this is a tropical hardwood), this is extremely hard and dense, and looks a bit like mahogany. It somtimes has a lighter appearance.

Most of the flatbeds that I have ever unloaded lumber from have aluminum floors...
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Old 11-17-2015, 06:43 PM   #30
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Awww...spend some real money and go with Lignum Vitae!
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