Dry wood termites attack is one of the problems that cause huge losses in timber construction. One way to solve this problem is by preserving wood, with synthetic chemicals or natural ingredients. The purpose of this preliminary research was to determine the effect of ironwood powder extract as a natural wood preservative. Preservation methods conducted were cold immersion at normal temperature (± 25°C) and hot immersion at 80°C. Variations in the concentration are 5%, 10%, 15%, and 20%. Variation of immersion time are 1, 2, and 3 days for the cold immersion and 0.5; 1; 2; 3 hours for the hot immersion. Results show that mortality data and the degree of attack of dry wood termites. The results showed that the mortality of the dry wood termites increased 4−6%. However, no difference was found on the degree of attacks between preserved and control wood.