8. Install insulation between or over rafters.

  • Tiled Skillion Roof Truss with Insulated Ceiling Boards

Description R-Value Zones 1-7 R-Value Zone 5H
Total R-Value of Tile, concrete or clay Roof & Ceiling Materials ±0.35 ±0.35
Minimum added R-Value of Insulation 3.35 2.35
Total R-Value m².K/W 3.70 2.70