The United States is facing a housing shortage that continues to put upward pressure on home prices and limit access to affordable housing. According to the Up for Growth 2025 Housing Underproduction study, the country remains millions of homes short of meeting current demand – a gap that cannot be closed without increasing the pace and scale of home construction. …In residential construction, two primary lumber species underpin nearly all home building: Spruce-Pine-Fir (SPF) and Southern Yellow Pine (SYP). These are not interchangeable commodities, they are complementary materials with distinct structural properties, regional availability, and performance characteristics. SPF, largely grown in Canada and the Pacific Northwest, is valued for its strength-to-weight ratio, dimensional stability, and ease of use in framing applications. SYP, produced primarily in the U.S. Southeast, offers high density and strength, making it well-suited for other structural and composite uses. Both are essential, and neither alone can meet the needs of the U.S. housing market.