relative to the use of spruce-pine-fir lumber.

SB 503 amends New Hampshire's building code to allow New Hampshire-grown spruce-pine-fir-south (SPFS) lumber - currently graded as a separate, slightly weaker classification - to be used interchangeably with Canadian-sourced spruce-pine-fir (SPF) lumber in construction. This directly affects local sawmills, loggers, and builders who previously faced higher costs and logistical hurdles when using New Hampshire wood, as it was often exported, regraded as SPF in Canada, and reimported. The key provision requires building codes to accept SPFS lumber (harvested and milled in New Hampshire) wherever SPF is specified, using published SPFS design values for structural calculations. This removes an artificial barrier based on political borders, recognizing that New Hampshire's climate and wood quality are comparable to Canadian SPF. The bill does not change grading standards but ensures local wood meets code requirements without requiring re-importation.