Original 1948 insulation trade vintage catalog for the SIMPSON LOGGING COMPANY. (Wood Fiber Division). Main office was located at 1010 White Building, Seattle, WA. The plant was located in Shelton, WA.. 

Manufacturers of Insulating Board Products.   (Since 1895).

Products include Insulating Sheathing, Lath, Plank, Decorative Tileboard and Building Board. Made from the Long, Strong Fibers of Douglas Fir.

The Simpson research laboratory discovered that when properly united, the Douglas fir fibers produce an amazingly strong insulating board with superior structural strength and unusual heat and sound insulating properties. 

Has product image, illustrations, description, application and specifications provide product details.

Unbound from a large rare 1947-1948 Catalog File, this unique old eight-page technical brochure would display beautifully matted and framed. Awesome cover graphics. A fabulous addition to your retro construction insulation library. Pages contain residual glue on the edge.