Hanging doors and windows, and many other customary details of building
construction should be done in the usual manner in building with logs.
Whenever cupboards or other built-in units are constructed, they must
be framed to be independent or entirely free of the log walls, like the
furniture. However, such fixtures as lavatories may be attached to two
adjacent logs without any subsequent structural complications.
[Illustration: Figure 23.--Flooring. _A_, Plain tongue and groove; _B_,
random-width planking.]