lntensive Research Backs Maior Advance ln Siding

ltHE BUILDING INDUSTRY'S first r clear prefinished redwood siding has been perfected after three years of intense research and development by Union Lurnber Company. Sherman A. Bishop, vice president of the California lumber producer, announced the new product is nou' being marketed under the Noyo brand with the specifrc trade name "RG-5 Redwood Siding."

Heretofore, completely prefrnished exterior redwood has been limited to opaque paint coatings. Union's new .'RG-S" finish, however" is the characteristic redwood color which, Bishop points out, "is perhaps the primary reason redwood siding is specified in the first place."

The new siding is CRA certified kiln dried vertical-grain redwood which has been pre-coated at the mill with a super durable film of 7 mils thickness. Several tirnes more than FHA requirements, the resulting hard shell surface is claimed to possess a degree of durability never before approached'by any clear finish for exterior wood. To back up this claim, Union Lumber Company guarantees "RG-5" siding against blistering, peeling, cracking or flaking for a period of five years from date of installation. This marks the first time a lumber manufacturer has issued a written warranty for a clear finish in any species of wood.

Major innovations ofiered by Union's prefinished siding include: (l) long lasting "maintenance free" surface which will endure years of severe climate of all types;

(2) warm, handsome redwood appearance which will not fade or bleach; (3) fast, economical installation utilizing concealed metal fastening system; (4) elimination of all iob site painting, staining or other fin' ishing; (5) economies of factory versus field finishingi and (6) installation possible during wet weather.

Prior to its current introduction, Noyo RG-S Siding survived several years of exposure to weather on "test fences" throughout the country. Not a single incidence of film failure was reported. Further tests on accelerated weathering equipment backed up Union's claim of a virtually weatherproof surface. Extending the test experience beyond the laboratory, two homes in Fort Bragg, one in New York and one in Maryland were designed for RG-5 exteriors. Continuous inspection of these test homes is scheduled for the years ahead.

RG-5 was developed as a joint project with the industrial finishes laboratories of National Lead Company, manufacturers of Dutch Boy paints. Utilizing specially designed, patented equipment at the Union Lumber Company research center in Fort

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