The September Whole House Commodity Index was essentially flat at $54,321 from August. But that headline number hides significant volatility underneath. OSB jumped 10.7%, Southern Pine 2x4s climbed 15.7%, while Southern Pine 2x12s fell 10.9% and spruce studs dropped 4.8%. For builders and contractors, the takeaway is clear: a flat Index does not mean flat costs. This month’s report looks at the material swings, softer housing market, rising rates, and other cost pressures sha