High R-Valued Materials

Material	R-Values
Vacuum insulated panel	30 - 50
Silica aerogel	10
Polyurethane rigid panel (CFC/HCFC expanded) initial	7 - 8
Polyurethane rigid panel (CFC/HCFC expanded) aged 5–10 years	6.25
Polyurethane rigid panel (pentaneexpanded) initial	6.8
Polyurethane rigid panel (pentane expanded) aged 5–10 years	5.5
Foil-faced polyisocyanurate rigid panel (pentane expanded ) initial	6.8
Foil-faced polyisocyanurate rigid panel (pentane expanded) aged 5–10 years	5.5
Polyisocyanurate spray foam	4.3 - 8.3
Closed-cell polyurethane spray foam	5.5 - 6.5
Phenolic spray foam	4.8 - 7
Thinsulate clothing insulation	1.6 - 2.9
Urea-formaldehyde panels	5 - 6
Urea foam	5.25
Extruded expanded polystyrene (XPS) high-density	5 - 5.4
Polystyrene board	5.00
Phenolic rigid panel	4 - 5
Urea-formaldehyde foam	4 - 4.6
High-density fiberglass batts	3.6 - 5
Extruded expanded polystyrene (XPS) low-density	3.6 - 4.7
Icynene loose-fill (pour fill)	4
Molded expanded polystyrene (EPS) high-density	4.2
Home Foam	3.9
Rice hulls	3.0
Fiberglass batts	3.1 - 4.3
Cotton batts (Blue Jean insulation)	3.7
Molded expanded polystyrene (EPS) low-density	3.85
Icynene spray	3.6
Open-cell polyurethane spray foam	3.6
Cardboard	3 - 4
Rock and slag wool batts	3 - 3.85
Cellulose loose-fill	3 - 3.8
Cellulose wet-spray	3 - 3.8
Rock and slag wool loose-fill	2.5 - 3.7
Fiberglass loose-fill	2.5 - 3.7
Polyethylene foam	3
Cementitious foam	2 - 3.9
Perlite loose-fill	2.7
Wood panels, such as sheathing	2.5
Fiberglass rigid panel	2.5
Vermiculite loose-fill	2.13 - 2.4
Vermiculite	2.13
Straw bale	1.45
Papercrete	2.6 - 3.2
Softwood (most)	1.41
Wood chips and other loose-fill wood products	1
Snow	1
Hardwood (most)	0.71
Brick	0.2
Glass	0.14
Poured concrete	0.08

https://en.wikipedia.org/wiki/R-value_(insulation)