Join Date: Jan 2008
Location: Amidst of 1000 acers of crawfish ponds under a 500 year old Oak grove. SW La
I am not pushing the uses of treated pine, however this is a few facts you should know.
The old treated lumber contained Chromated Copper Arsenate (H1 - H5) Known as CCA
It has long being considered a safe and cheap treatment method for all treated pine. Although it was scientifically found to be carcinogenic it is still the preferred choice for most builders. Its mild carcinogenic properties are easily avoided with proper handling. From March 2006 it will no longer be able to be used in decking, handrails or playground equipment.
LOSP Treatment Light Organic Solvent Protection (H1 - H3)
This was becoming the Arsenic Free substitute for CCA products, however it is generally more expensive and far less effective. Most LOSP treated pine must be painted to maintain its warranty (which is half as long as CCA). Without painting LOSP treated timbers may only last a few years)
ACQ Treated pine contains Copper Azole Ammoniacal Copper Quaternary (H1 - H5) or Copper azole (CuAz) (H1-H5)
This will be the alternative to ARSENIC FREE treated pine. It is considered a very safe and very effective product with no risk to humans. At the moment it is approximately 25% more expensive than the CCA, additionally it is a little difficult to source, and as such is not very popular. The Osmose company produces an ACQ product called Naturewood. Its ingredients include Copper, Didecyldimethylammonium chloride and water.
The chloride used to treat the new lumber is the same product that is in bleach. So sitting on damp treated pine may turn your behind a little whiter.
One more thing, ACQ treated wood is also caustic to steal. Meaning it will eat most nails and screws it come in contact with. Stainless is the only way to go useing ACQ wood.
Collector of Old Tools
Fixer of all things broke
Expert = Drip under pressure
Last edited by Handyman; 02-23-2009 at 06:44 AM.