Why Termites Build Hanging Shelter Tubes
Hanging Shelter Tubes
Often it is very difficult for subterranean termites to maintain humidity near or at the saturation point in their feeding galleries and shelter tubes. When they build their shelter tubes on masonry and wood, these materials will absorb moisture, thus causing problems within the tubes. In an effort to reduce the loss of moisture to the environment termites line their tunnels with secretions that hardens and forms a moisture-resistant layer.
Another problem presents itself in the form of distance. Termites are often unable to feed on wall studs more than a few feet from the floor because they would be to far from a humidity source. Floor joist too represents an increased linear distance from the moisture source. So to provide more moisture to the joist, termites construct hanging earthen lined shelter tubes downward from the joist as shown in the picture below.