First of all, «log houses» appeared.

First of all, «log houses» appeared. This construction option was popular in the northern latitudes, where there are many forests: in Sweden, Finland and in Rus’. The advantages of these structures are beauty, strength and heat. The structure of the structure provides minimal, even invisible to the naked eye of the gaps between the logs, which allows you to do everything with one layer. Now there are many examples when logs are still laid in two layers, which enhances the strength of the structure and its ability to retain heat.