Wooden structures not built with insect-resistant wood can become fodder for termites. To prevent an infestation, try to avoid contact between earth and wood (termites must draw water from the soil every day). Concrete footings make it difficult for termites to reach the structure. Still, termites may attempt to bridge the gap by building brown shelter tubes - slightly thicker than a pencil - up the side of a footing to reach the wood. If you find a termite tube, brush it away and wait a few days. If the tube is rebuilt, you have an active infestation. Contact a licensed pest control operator.

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