| abstract |
(57) [Abstract] [Purpose] Insulating building materials that are inexpensive, high quality, and excellent in breathability and pest repellency. [Structure] A suitable amount of cedar or cypress bark crushed pieces impregnated with a flame retardant agent are packed in a breathable storage container such as a nonwoven mesh bag, and used as a heat insulating material for construction such as ceilings, walls and floors. |