Performance Evaluation of Stained, Rough-Sawn Southern Pine Siding

Data after 2-1/2-years exposure suggest that an improved system of manufacturing, applying, and staining southern pine siding may lead to a much improved service life in aspects of both performance and appearance. The siding is being tested on the east and west exposures of a large building in central Louisiana. The roof overhang is considerable, but its protective effect is largely negated by the 22-foot height of the wall. The specifications were for 1- by 6-inch, bandsawn, B and better, kiln-dried southern pine with rough face and edge-V on bark side and 3/8-inch center-match tongue and groove. Face width was 5-1/8 inches, thicknessed on back only to 7/8- inch. Back side had two grooves 1/4 inch deep by 1/4 inch wide on third points. After kiln-drying, the siding was conditioned to constant weight in a large room maintained at 72?F. and 50 percent relative humidity. The resulting average moisture content was 9 percent. Half the boards for each exposure were dipped for 3 minutes in a water-repellent solution containing pentachlorophenol. The stain was heavily pigmented and contained a fungicide. All boards were dipped in the stain and allowed to dry on edge. A second coat was brushed on after installation. The siding was applied vertically over 3/8-inch southern pine sheathing. It was used in full lengths. Nails were annularly grooved, 2-1/8 inches long, and of stainless steel with blunt points. There were no significant differences between the stability of boards treated with water-repellent preservative and those not so treated, nor were differences observed between the two exposures.

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