Thanks Allen, many I have shown this video to did not know about the "closed caption." I should have pointed that out. If I am able to find the "English Version" of this I will link it here.
The material used is indeed
"jute" and/or
"hemp fiber" oakum. A traditional material with many applications, and recipes for treatment and placement. In this video it is pretreated with "
pine tar oil."
The methods shown in the video for this type of "hirsirakennus" (log architecture) has many variations often reflecting a region's own "style." Some for example use only moss and lichen treated with pine tar oil, while others will use
"flax fiber" and/or hemp. Some will also mix wood ash with the saw dust, while others won't use dirt at all and only wood ash and/or sawdust mixed with wood ash under the floor. Many modalities and styles in this family of architecture...
Regards,
j