Accelerated exposure test of wood plastic composites （WPCs） by a xenon lamp （JISK7350－2） was conducted. We evaluated the correlation between outdoor and accelerated exposure tests for the surface deterioration of WPCs by the extent of chalking. We then found that the xenon lamp test and the subsequent ultrasonic cleaning by distilled water was effective for the reproduction of the chalking phenomenon of outdoor exposed WPCs. As a result, the ratio of outdoor exposure time to accelerated exposure time corresponding to outdoor exposure time（acceleration factor）was approximately 7－9. Also, it was determined that deterioration of both wood and plastic elements occurred on the surface of WPCs by conducting various instrumental analysis methods, and a degree of the deterioration was found to be similar between outdoor and accelerated exposure tests. From these results, it is reasonable to support that accelerated exposure test by a xenon lamp well simulated the surface deterioration process of outdoor exposed WPCs.

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In concurrence with the popularization of the basement insulation method, damagecaused to wooden structural materials, such as foundations and pillars, by termites thatcrawl up inside the basement insulation from the soil has become a problem. As a measureto repel termites at the joints of insulation as well as around the pipes that penetrate thefoundation, we propose anti-termite insulation manufactured by adding a termite repellentto the raw material for the extruded polystyrene foam insulation board, and an adhesivecontaining termite repellent. To confirm that these anti-termite materials perform their anti-termite performanceover a long period, we installed anti-termite materials in a test building whose conditionswere close to actual conditions and confirmed the long-term performance of the anti-termitematerials. This article reports the results of a 10-year observation of the test building with whichinsulation outside the foundation is assumed with outdoor installation of Styrofoam AT, ananti-termite insulation certified by the Japan Wood Protection Association. We confirmedthat the anti-termite performance were effective even 10 years after installation, throughmeasurement of the quantity of residual termite repellent and performing indoor termiterepellency test on the anti-termite insulation Styrofoam AT, which was collected from thetest building 5 and 10 years after installation.

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