During this study, the protective effects of heat treatment and micronized copper quat (MCQ) impregnation on wooden surfaces in outdoor conditions were observed. Within the scope of the study, the 15-month weathering test effects on the Uzungol and Hidirnebi plateaus on oriental beech (Fagus orientalis L.) and Scots pine (Pinus sylvestris L.) wooden materials were studied. Changes of color, roughness, and visual-macroscopic values were compared on wooden surfaces that were subjected to weathering tests. Changes in the chemical properties of exposed surfaces were investigated with Fourier transform infrared (FTIR) spectroscopy. The presented data have clearly shown that the MCQ and heat treatment methods increased the stabilization of color and have slowed down the physical and chemical degradation on the wood surface under outdoor conditions. Moreover, the best protection methods against weathering were found to be heat treatment of Scots pine and MCQ impregnation of oriental beech. (C) 2016 American Society of Civil Engineers.