If you've ever toyed with Lincoln Logs or built a bonfire using the "log cabin" method, you'll be well versed in the structure of a stacked log home. What some folk may not recognize is that a log structure is not built with logs that fit perfectly together. Rather, the logs sit tight only at the notching points, with room between the log length traditionally referred to as the "chink". Wood expands and contracts regularly with changes in temperature, they can twist, bend, and flex while serving as your beloved structure so this spacing is crucial. But now you've got a ventilated stack and winter winds are starting to creep in. Time for an insulating substance to fill those gaps while allowing your logs to breathe! In the hay day, you'd find homesteaders shoving cloth, chicken wire, home-made mortar, cement, and just about the whole kitchen sink in those gaps, calling it "chinking". While it may have filled the spaces open to the elements, it didn't allow for log flex and wouldn't keep the critters or flies at bay. Thanks to polymer science and hundreds of years of recipes to learn from, you can seal up your home or structure with a substance that'll tick all those boxes. Our modern day chink!