Canadian lumber has been left out of Trump’s tariff blitz, despite the president’s repeated threats to add to import taxes to a big chunk of US wood supply. Prices for two-by-fours are tumbling. Lumber futures contracts shed 8.7% to end at $606 per thousand board feet, the lowest price since mid February. They are on track for their worst day since the pandemic-era lumber bubble burst three years ago. Prices had risen this year in anticipation of another layer of import taxes. …That climb is unwinding. But the decline can also be chalked up to expectations that tariffs will push up residential construction prices and strain affordability. The tariffs Trump announced Wednesday will add about $6,400 to the cost of building an average house, UBS analyst John Lovallo estimates. That assumes that about 7% of the materials are imported and subject to an average tariff of 22%. [to access the full story a WSJ subscription is required]