
- Polyisocyanurate Insulation: Highest R-value per inch of roofing insulations at about R5.56 per inch. This product uses the LTTR or Long Term Thermal Rating because it loses some R-value over time. Using the LTTR gives the roof a true rating of what the roof will achieve during its life.
- Perlite Insulation: Usually used as a cover board over polyisocyanurate. R-value is 2.78 per inch.
- Wood Fiber Insulation: Primarily used as a coverboard in roof systems to create a rigid surface or improve attachment. R-value 2.64 per inch.
- Georgia Pacific DensDeck: Generally used as a coverboard in roof systems to create a rigid surface or improved attachment. R-value is .28 per 1/4 inch thickness.
- EPS: Commonly used to create thickness and slope in Lightweight Insulating Concrete roof deck. R-value of 3.85 per inch.
- Coatings: SRI 104
- TPO: SRI 101
- PVC: SRI 109
- Modified Bitumen (MB): SRI 30
- MB (High Reflective): SRI 93
- Built-Up Roof: SRI 9
- Metal: SRI 23-86
- Tile: SRI 29-69
- Shingles: SRI Up to 26