Building a Solar-Heated Pit Greenhouse by Greg Stone

Author:Greg Stone
Language: eng
Format: epub
Publisher: Storey Publishing, LLC
Published: 1980-09-15T16:00:00+00:00

Wood Preservatives

A greenhouse doesn’t have to be built of wood. You could use PVC piping, aluminum, or even steel. However, most people who design and build their own greenhouses use wood.

Greenhouses are very humid; untreated wood decays rapidly in them. The following are naturally decay-resistant woods listed in descending order: 1. black locust, 2. osage-orange, 3. red cedar, 4. redwood, 5. white oak, and 6. cypress. Some of these woods are becoming scarce and are expensive. Others, such as redwood, are not as strong as some other common types. For these reasons, many people are turning to pressure-treated wood.

Pressure treatment is a process whereby preservative chemicals are forced throughout the wood. The result is a product that will last longer than most of the woods just listed. Pressure treatment does vary, however, so make sure you understand what you are purchasing and whether or not the wood has been treated for in-ground or above-ground use. Also check on the chemicals used in the process. Stay away from oil-borne preservatives, such as creosote. Their fumes are highly toxic to plant growth. Look instead for the water-borne, salt-type preservatives, as most of these are non-toxic to plants. Examples of these are acid copper chromate, chromated zinc chloride, chromated copper arsenate, and fluor chrome arsenate phenol.

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