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Re: Pressurized timbers

Title: Re: [GWL] Pressurized timbers
   Pressure treated or chemical treated wood is only one way.  Think outside the box when writing about such things.
   Alternatives to pressure treated timber.  Plastic lumber, made of recycled plastic (largely, food grade plastic jugs and plant pots), rot resistant wood such as black locust, and wood coated with water-emulsified asphalt (cold applied roofing tar is the main one).   The last one is mainly for fence posts and the like, nothing near food.  Not so much for toxicity, rather the stuff stinks when it's warm.
   -Lon Rombough
   


On pressure treated timber, there are a number of reasons that CCA
(Copper/Chromium/Arsenic) treatments are being phased out, or their
use reassessed, in many countries worldwide.

One is the possibility of small amounts of Arsenic leaching from the
wood surfaces. Arsenic is toxic and possibly carcinogenic.

The other problem is what happens when the wood structure is finally
disposed of. If it is burnt, the small ash particles will contain the
remains of the toxic preservatives and might be inhaled.

I looked into CCA with regard to the use of treated timber by or in
fishponds. Pressure treated timber is still considered more effective
and safer than many of the solvent based, painted-on preservers.
However, pressure treated timber can cause problems to fish,
especially in small enclosed ponds. This is especially the case when
freshly cut, unweathered timber, is placed directly in the water.

James Allison

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