A series of long-term field tests have been evaluating the performance of various preservative treatments for shakes and shingles. This report updates the performance data for these products. CCA continues to be highly effective in protecting shakes. After 45 years in test, western redcedar shakes treated with CCA-B remain serviceable. After 20 years in test, pine and spruce shakes, treated with CCA, had no confirmed decay. ACQ-D and CA-B were effective in protecting western redcedar shingles, with little decay observed after 15 years of exposure. Propiconazole and oxine copper were associated with greater levels of decay and would not be recommended for protecting western redcedar shingles at the retentions evaluated. Longer exposure time is needed to evaluate the efficacy of the DDACarbonate and alkylamine oxide treatment.