Fire-Resistant Boards Made of Wood Strands and Inorganic Binders

Two types of fire-resistant boards can be made that are commercially sound using specially cut wood strands obtained from cord wood, defective logs, and cores remaining from the cutting of veneer. A board made with portland cement as the binder can be felted in a continuous operation but requires over-night pressing. This board has excellent sound-absorbing value and is comparable in this respect with conventional acoustical tile. Its manufacturing cost is far below that of acoustical tile. The second board is a porous embedded fiber board made of the same strands bonded with gypsum. It is faced on both sides with gypsum applied by machinery in the factory. The total materials cost for this board in the 1/2-inch thickness is only 1-1/2-cents per sq. ft. It is more-fire-resistant than paper-faced gypsum boards and stronger and stiffer than insulation board and much stiffer than 3/8-inch plywood across the grain of the faces. It has a large potential market for dry-wall construction to replace lath and plaster and as bevel-edged planking with concealed nailing.

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