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Lumber is the most common construction material for making raised beds. [2] If using lumber treated with chromated copper arsenate or CCA (though uncommon since 2004 in the US and Europe [4] [5]), it is recommended to use a plastic liner between the wood and soil if the raised bed is intended for growing edibles.
A study has found that soil contamination due to the presence of CCA-treated wood after 45 years was minimal. [13] Many studies in less aggressive soil types show leaching to be as low as 0.5 ppm (red pine poles in service,) or up to 14 ppm (treated pine in garden beds).
The copper in ACQ treated wood accelerates corrosion of galvanized steel fasteners (such as nails and screws) 10 times or more in comparison with CCA-treated wood. Stainless steel (AISI 316) is not affected. [7] Aluminium and Galvalum fasteners should be avoided. [8] One should use fasteners made of hot-dipped galvanized steel, copper, or ...
Apart from structural wood preservation measures, there are a number of different chemical preservatives and processes (also known as timber treatment, lumber treatment or pressure treatment) that can extend the life of wood, timber, and their associated products, including engineered wood. These generally increase the durability and resistance ...
The following expert tips will help you use wood ash in the garden safely and effectively. Meet Our Expert Chelsea McKinley is a plant health specialist at the U.S. Botanic Garden in Washington, D.C.
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