There has been a lot if discussion about PT.
Here is the result of a 20 year test. You can see the grade of PT (amount of CCA) makes all the difference in the world.
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gfretwell
My lumber yard has starting carrying all 2x lumber in .25 AQZ. Labeled for above ground use only.
Only 4x4 is carried in .40.
6x6 will be .60
Another yard that has not switched to the .25 says they are under alot of pressure from customers pricing and from suppliers to switch to .25
It's all about the lowest price and the heck with how long it lasts.
I'm POed about it. It's my work and reputation that is on the line.
Rich
"It's all about the lowest price and the heck with how long it lasts."
Bngo. As long as the majority of people shop mainly based on price things will never change.
Can you cry under water?
I don't want to stir up a hornet's nest... But, I do not think you can buy pt lumber at 2.65. The highest level of retention I have ever seen
in 30 yrs of selling is 2.50. This is usually reserved for salt water exposure and docks.
I did buy salt water treated.
This was from the Ft Myers Wolman plant outlet and that is what they told me it was. If it was really 2.5 and not 2.65 I doubt it is significant.
The CCA totally penetrated the 2x8 as you see.
In Hawaii, the home of the Formosian termite, I think CCA (wolmanized) treated wood is no longer sold. It never was any good since the solution just "sat" on the surface and hardly penetrated more than 1/4" of the wood. Hawaii had a category, HUO (Hawaii Use Only) which had an extremely high content, I don't remember how high. Presently, only HIBOR (borates in a water solution) treated wood is sold. I understand that the penetration is 100% in 2X lumber. More efficient and less toxic to the environment.
Treatment soaks in at different rates depending on what wood being treated.
In Hawaii, all the CCA treated lumber was pressure treated; i.e., place in huge chambers. Almost all the lumber were firs.
That is the way that all CCA treament was done.What is was talking was different wood species.SYP, which is what is used in most states east of the rocky's, takes it a lot easier than d fir. For d fir, they incise it to help it take treatment. And then it is still limited absorbtion..
William the Geezer, the sequel to Billy the Kid - Shoe
I had the opportunity to talk to the manager of the Wolman plant here and he told me the only way to get decent penetration in the SYP we have here was to use well dried lumber before you start. Garbage in garbage out. They pretty much only made "salt water" grade PT here and used #2 or better.
I don't know what "well dried" is.But all of the PT lumber that have sever seen has had a KD stamp on it. So it was dried to at least 19% before treatment..
William the Geezer, the sequel to Billy the Kid - Shoe
PT lumber grades- Damp, wet, and swamp cured. I consider none of well dried unless it's KDAT (kiln dried after treatment) and then only if they stored it properly.
"There can be no doubt that Socialism is inseparably interwoven with totalitarianism and the abject worship of the state…Socialism is in its essence an attack not only on British enterprise, but upon the right of ordinary men and women to breathe freely without having a harsh, clammy, clumsy tyrannical hand clasped across their mouth and nostrils" -Winston Churchill
What he meant is it is KD before treatment.
Kiln dried and stored in the warehouse.
Incising lumber was done only where the material would not be seen at completion, quite unattrative otherwise.
Hemlock, I think, took CCA more readily; however, D Fir was the preferred material locally. Very little difference between the two when comparing the stress ratings.
Do they still sell CCA treated lumber where you live?
You can get CCA at a marine contractor supply.