Decay Factors of Wooden Windowframes in Schoolhouses

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The decay factors in wooden windowframes of four schoolhouses, set in about 30 years ago, were examined. Average percentages of decayed volume in the underframes, verticalframes and overframes were 1.51, 0.60 and 0.19%. Some factors influenced on decay of windows were analyzed by a statistical analysis "Quantification 1". Five items of decay factors : aspect of window face, projecting length of eave, wethered slope of underframe, distance between the window face and the crown of garden tree, good or bad at opening and shutting were taken up for the analysis. The criterion variables were percentages of decayed volume. According to the "Quantification 1", one of the most influential decay factors in windowframes was the distance between the window and the garden tree. Contribution ratio of the five decay factors was 48.3%.<BR>To examine the relation among some deteriorative phenomena of wood, the multiple regression anlysis among rating of paint peeling, cracking size, and decayed volume was carried out. High correlation between cracks and decay was recognized. Contribution ratio of cracks to decay was 51.4 %.<BR>For preventing wooden windowframe members from decay, it is recomended to have a distance at least 1m away between window face and crown of garden tree, and to prevent surface cracks on wood.
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