Typical per-unit-thickness R-values for material

From WikipediA

R-values per inch given in SI and Imperial units (Typical values are approximations, based on the average of available results. Ranges are marked with “–”. Clicking on SI column sorts by median value of range, clicking on Imperial column sorts by lowest value. Third column are real SI values that are not per inch. Based on the units, the two last columns should have a conversion factor of 5.71. In practice, the numbers will have been measured using different methods.)

Material

ft2·°F·h/(BTU·in)

Air-entrained concrete[17]

R-3.90

Brick

R-0.2

Cardboard

R-3–R-4

Cellulose loose-fill[21]

R-3–R-3.8

Cellulose wet-spray[21]

R-3–R-3.8

Cementitious foam

R-2–R-3.9

Closed-cell polyurethane spray foam

R-5.5–R-6.5

Cotton batts (Blue Jean insulation)[20]

R-3.7

Extruded expanded polystyrene (XPS) high-density

R-5–R-5.4

Extruded expanded polystyrene (XPS) low-density

R-3.6–R-4.7

Fiberglass batts[19]

R-3.1–R-4.3

Fiberglass loose-fill[22]

R-2.5–R-3.7

Fiberglass rigid panel

R-2.5

Foil faced Polyurethane rigid panel (pentane expanded)

Foil-faced polyisocyanurate rigid panel (pentane expanded ) initial

R-6.8

Foil-faced polyisocyanurate rigid panel (pentane expanded) aged 5–10 years

R-5.5

Glass[15]

R-0.14

Hardwood (most)[25]

R-0.71

High-density fiberglass batts

R-3.6–R-5

Home Foam[18]

R-3.9

Icynene loose-fill (pour fill)[16]

R-4

Icynene spray[16]

R-3.6

Molded expanded polystyrene (EPS) high-density

R-4.2

Molded expanded polystyrene (EPS) low-density

R-3.85

Open-cell polyurethane spray foam

R-3.6

Perlite loose-fill

R-2.7

Phenolic rigid panel

R-4–R-5

Phenolic spray foam

R-4.8–R-7

Polyethylene foam

R-3

Polyisocyanurate spray foam

R-4.3–R-8.3

Polystyrene board[15]

R-5.00

Polyurethane rigid panel (CFC/HCFC expanded) aged 5–10 years

R-6.25

Polyurethane rigid panel (CFC/HCFC expanded) initial

R-7–R-8

Polyurethane rigid panel (pentane expanded) aged 5–10 years

R-5.5

Polyurethane rigid panel (pentane expanded) initial

R-6.8

Poured concrete[15]

R-0.08

Rock and slag wool batts

R-3–R-3.85

Rock and slag wool loose-fill[22]

R-2.5–R-3.7

Silica aerogel

R-10

Snow

R-1

Softwood (most)[25]

R-1.41

Straw bale[24]

R-1.45

Thinsulate clothing insulation

R-5.75

Urea foam[15]

R-5.25

Urea-formaldehyde foam

R-4–R-4.6

Urea-formaldehyde panels

R-5–R-6

Vacuum insulated panel

R-30–R-50

Vermiculite loose-fill

R-2.13–R-2.4

Vermiculite[17]

R-2.13

Wood chips and other loose-fill wood products

R-1

Wood panels, such as sheathing

R-2.5

Advertisements
This entry was posted in Construction and tagged , . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s