Log cabins, particularly those where the bark is left on, fall heir to
many evils in the form of borers and beetles that make their homes in
the bark. Winter-cut logs are less likely to have borers than others,
and if they are to be peeled, peeling should be done in the spring
before the first flight of the beetles. Cedar and redwood are almost
entirely free from borers. Peeled logs are not likely to attract boring
pests, but they may be the home of larvae previously laid there.
If you do not care if your logs are stained, they may be painted with a
solution of liquid oil coal-tar creosote. This stains the bark a dark
brown, if used straight, but diluted with three parts kerosene it stains
only slightly. The odor is rather unpleasant, but if the treating is
done several months before the logs are used, it will wear off.
Pyridine, a colorless liquid, is one of the best pest killers. It also
has a strong, unpleasant odor. It should be applied on a windy day and
in the open air. It burns the skin slightly, so be careful. Also, it is
highly inflammable.
Paradichlorobenzene is a very effective control but is not permanent in
effect. It will, however, rid your logs of existing pests by slowly
liberating a gas which kills the insects. Dissolve three parts, by
weight, in a gallon of kerosene and apply either with a spray gun or a
brush. Small logs may be dipped in a trough filled with the solution.
Two gallons will saturate about 100 square feet of wood surface.
For logs that are to retain their bark, it is also well to paint all cut
places and knots with crude creosote soon after cutting and again before
use.
[Illustration: Fig. 9. Gable end showing ridge pole and purlins with
rafters notched over them.]