Should you use pressure treated wood for raised garden beds? Non-porous plastic can retain too much water and discourage beneficial insects. ![]() Landscape fabric can be found at garden supply stores and cloth fabric can be found in clothing. You can line your raised bed to make it more durable and to prevent toxics from leaching into the soil. Sprayed surfaces are more expensive than coated surfaces because they require more time to dry and are less effective at protecting against insects and fungi. Other coatings, such as those that are applied directly to wood, are called “sprayed” surfaces. The most common is to coat the entire surface with a thin layer of ceramic. It can be applied in a variety of ways, depending on the type of coating. Ceramic Coating Ceramic coating is applied to the surface of wood to protect it from moisture and insects. They are also used to treat wood that has been exposed to extreme heat, cold, moisture, or chemicals. These ingredients are important in protecting the wood from pests. Pressure-Treated Landscape Timber The active ingredients may vary, but the solution commonly includes alkaline copper quaternary, copper azole or micronized copper azole. How do you keep landscape timbers from rotting? If you have any information on this, please let me know. I’ve also heard that some people have had problems with the chemical leaching into their drinking water, but I haven’t been able to find any research to back this up. However, I have not seen any evidence that this is a problem in raised beds. From what I’ve seen, the consensus is that the chemicals do leach out of the wood into the soil and are uptaken by the plants in the garden. Several researchers examined the safety of pressure treated lumber for raised bed gardens. Does pressure treated wood leach into soil? The nails should be spaced at least 1 foot apart on each side. Secure the Timber Border To the Ground With Rebar (Optional) If you prefer, you can secure the wood border with 2-by-4s (or similar) secured with 1-1/4- in. The timbers should be pinned to the soil with 12-inch lengths of #3 rebar driven with a 1/2 inch drill bit. ![]() The holes should be drilled through the center of the timbers, spacing them about 4 feet apart. If you want to secure the timber border with rebar, pin the timbers with rebar.
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