Kamps Hardwoods, a Michigan-based manufacturer of kiln-treated lumber used for homes and furniture, seized on the opportunity to expand in China — at first. At a Chinese trade show in 2015, Rob Kukowski, the company’s general manager, said a Chinese buyer stunned him with a huge offer to buy enough stock to fill 99 shipping containers. The $2 million order of lumber accounted for four months’ worth of business for Kamps.

Chinese buyers were so desperate for lumber back then that they would visit the company’s booth and refuse to leave until Mr. Kukowski accepted a million-dollar deal on the spot. By 2016, China accounted for 80 percent of the company’s sales.

Kamps soon realized that it was hard to make a profit from the large Chinese orders because many buyers were not interested in quality and only wanted the cheapest possible price. The company started to focus its effort on finding customers in the United States and other overseas markets who were willing to pay more for a better product.

It was fortuitous timing. When China raised tariffs on U.S. lumber in 2018 as part of a trade war, Kamps was better positioned to weather the downturn. Today, China accounts for only 10 percent of Kamps’s sales, but it still has a large indirect impact on the company. Mr. Kukowski said China is such a big buyer of U.S. lumber that a downward price war ensues throughout the industry when it stops spending.