In log home construction, the timbers are never placed directly on top of one another. Space for expansion and contraction is always included, and chinking is a flexible sealant.
The timbers in log construction can be run through a saw to create squared, flat surfaces, such as these milled logs. The chinking is the white infill between the logs.
The chinking in this home has been applied to round, peeled logs. Chinking needs to be waterproof, long lasting and flexible, to allow for the logs' expansion and movement.
Chinking is applied very much like the caulk used to seal doors, windows and plumbing systems in a conventional home.
Originally chinking materials were whatever was available nearby, such as combinations of moss, clay, oakum, mud, straw, plants and horsehair.