Tar included in smoke from burning wood penetrates into building materials of beams, thatched roof, or straw roof, enhancing bug-proof property or waterproofing property.
また薪を燃やすときの煙に含まれるタール（木タール）が、梁や茅葺屋根、藁屋根の建材に浸透し、防虫性や防水性を高める。