Compressive strength ranges from 150 kPa (general wall insulation) to over 300 kPa (roofing applications). For inverted roofs or floors under high loads, high-density boards exceeding 400 kPa are available. This makes PU suitable for applications requiring structural performance. The compressive strength correlates with density (typically 30-50 kg/m³), and manufacturers provide specific load-bearing data for different applications including parking decks, industrial floors, and green roofs.

