Lumber futures tumbled toward $590 per thousand board feet, a near one-month low, as weakening US housing activity and pre-tariff front-loading left wholesalers awash with stock while stacked US duties on Canadian imports and trade uncertainty pushed prices lower. US homebuilding has slowed, with housing starts falling 8.5% in August to a 1.307 million annualized pace and building permits drifting lower. Many US buyers front-loaded inventories ahead of expected import tariffs earlier this autumn, leaving distributors to work down excess stock before fresh order flow returns. On the supply side, a 10% Section-232 tariff added in mid-October atop roughly 35% in existing duties lifted border costs above 45% for many Canadian shipments, forcing sellers to find new markets or accept lower domestic prices. Producers like Interfor have trimmed output since mid-October, but the cuts are too recent to significantly reduce inventories or regional log supply.