Sill Detail

damp wood and arc easily discouraged by details that keep wood dry. The most common species of termites can live in dry wood, provided that they have easy access to damp soil. These species are dealt with by keeping wood well above the soil line and bv install-ing a continuous Hashing with projecting edges between the sill and the foundation. The tubes that these termites build to make contact with the ground are easily spotted and destroyed where they cross the Hashing. Soil poisons are also used against this type of termite, but the safety of these poisons is coming under increasing scrutiny. A few species of termites that thrive only in very warm, damp climates can live in drv wood without soil contact, tak-ing their moisture from the air; these can be dealt with only by poisoning them. ■

Avoid exterior details in which two different metals arc attached directly to one another.

1. Simple corrosion occurs when air and moisture are present simultaneously on the surface of a metal. Most nonferrous metals (such as aluminum, zinc, brass, bronze, lead, and copper) quickly form stable, self-protecting oxide coatings that prevent further corrosion. Stainless steels and certain "weathering steels" are also self-protecting.

2. Ordinary steel (carbon steel), wrought iron, and cast iron need protective coatings to avoid destruction by oxidation (rusting) if they are used outdoors or in wet interior environments. These may take the form of paint, various factory-applied organic coatings, or metallic coatings.

3. The most common metal used for protective coating of steel is zinc. Zinc coating is known as galvanizing. Galvanizing works because the zinc slowly sacrifices itself through oxidation to protect the underlying steel, even healing small scratches in the coating with its oxide. Eventuallv, the zinc weathers

away, leaving the steel to rust. This can take from 5 to 40 years, depending on •-he thickness of the coating and the presence of salt and other pollutants in the air. For the longest possible life, use the heaviest available zinc coating. This is usually applied by means of traditional hot-dip galvanizing. There are many other methods of galvaniz-rg, some of which result in only thin coatings that have a short life. It is important to do careful research in er to determine the degree of pro-on that is required in a given situa-n and to specify the galvanizing ess and thickness of coating that best satisfy this need.

Oplan Termites

Oplan Termites

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