Vermont Marble, Granite, Slate & Soapstone Company

R-Value Table

Insulation Values For Selected Materials
Use the R-value table below to help you determine the R-value of your wall or ceiling assemblies. To obtain a wall or ceiling assembly R-value you must add the r-values of the individual components together.

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This method ‘Wall Assembly R-Value” gives incorrect results for MASS walls such as the All Wall System.

Example of error, as defined by ORNL research papers.

When compared to a 6” R-20 framed Wood Wall a Foam Block (ICF) wall performed with a 9% better Energy Savings.

A wall built like All Wall performed with an 18% better Energy Savings.  (9% over the Foam Block walls) because of the concrete being in direct contact with the interior.

See ORNL’s report conclusions by clicking here.  Oakridge National Laboratory

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Example:

Wall Assembly R-Value Example:

Component R-value
Wall – Outside Air Film 0.17
Siding – Wood Bevel 0.80
Plywood Sheathing – 1/2″ 0.63
3 1/2″ Fiberglass Batt 11.00
1/2″ Drywall 0.45
Inside Air Film 0.68
Total Wall Assembly R-Value 13.73

R-Value Table

Material R/
Inch
R/
Thickness
Insulation Materials
Fiberglass Batt 3.14
Fiberglass Blown (attic) 2.20
Fiberglass Blown (wall) 3.20
Rock Wool Batt 3.14
Rock Wool Blown (attic) 3.10
Rock Wool Blown (wall) 3.03
Cellulose Blown (attic) 3.13
Cellulose Blown (wall) 3.70
Vermiculite 2.13
Air-entrained Concrete 3.90
Urea terpolymer foam 4.48
Rigid Fiberglass (> 4lb/ft3) 4.00
Expanded Polystyrene (beadboard) 4.00
Extruded Polystyrene 5.00
Polyurethane (foamed-in-place) 6.25
Polyisocyanurate (foil-faced) 7.20
Construction Materials
Concrete Block 4″ 0.80
Concrete Block 8″ 1.11
Concrete Block 12″ 1.28
Brick 4″ common 0.80
Brick 4″ face 0.44
Poured Concrete 0.08
Soft Wood Lumber 1.25
2″ nominal (1 1/2″) 1.88
2×4 (3 1/2″) 4.38
2×6 (5 1/2″) 6.88
Cedar Logs and Lumber 1.33
Sheathing Materials
Plywood 1.25
1/4″ 0.31
3/8″ 0.47
1/2″ 0.63
5/8″ 0.77
3/4″ 0.94
Fiberboard 2.64
1/2″ 1.32
25/32″ 2.06
Fiberglass (3/4″) 3.00
(1″) 4.00
(1 1/2″) 6.00
Extruded Polystyrene (3/4″) 3.75
(1″) 5.00
(1 1/2″) 7.50
Foil-faced Polyisocyanurate
(3/4″)
5.40
(1″) 7.20
(1 1/2″) 10.80
Siding Materials
Hardboard (1/2″) 0.34
Plywood (5/8″) 0.77
(3/4″) 0.93
Wood Bevel Lapped 0.80
Aluminum, Steel, Vinyl
(hollow backed)
0.61
(w/ 1/2″ Insulating board) 1.80
Brick 4″ 0.44
Interior Finish Materials
Gypsum Board (drywall 1/2″) 0.45
(5/8″) 0.56
Paneling (3/8″) 0.47
Flooring Materials
Plywood 1.25
(3/4″) 0.93
Particle Board (underlayment) 1.31
(5/8″) 0.82
Hardwood Flooring 0.91
(3/4″) 0.68
Tile, Linoleum 0.05
Carpet (fibrous pad) 2.08
(rubber pad) 1.23
Roofing Materials
Asphalt Shingles 0.44
Wood Shingles 0.97
Windows
Single Glass 0.91
w/storm 2.00
Double insulating glass
(3/16″) air space
1.61
(1/4″ air space) 1.69
(1/2″ air space) 2.04
(3/4″ air space) 2.38
(1/2″ w/ Low-E 0.20) 3.13
(w/ suspended film) 2.77
(w/ 2 suspended films) 3.85
(w/ suspended film and low-E) 4.05
Triple insulating glass
(1/4″ air spaces)
2.56
(1/2″ air spaces) 3.23
Addition for tight fitting drapes or shades, or closed blinds 0.29
Doors
Wood Hollow Core Flush
(1 3/4″)
2.17
Solid Core Flush (1 3/4″) 3.03
Solid Core Flush (2 1/4″) 3.70
Panel Door w/ 7/16″ Panels
(1 3/4″)
1.85
Storm Door (wood 50% glass) 1.25
(metal) 1.00
Metal Insulating
(2″ w/ urethane)
15.00
Air Films
Interior Ceiling 0.61
Interior Wall 0.68
Exterior 0.17
Air Spaces
1/2″ to 4″ approximately 1.00

Vermont Marble And Granite Store



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Vermont Marble, Granite, Slate and Soapstone Co.
P.O. Box 723 1565 Main Street, Castleton, Vermont 05735
Ph: 802.468.8800 Fx: 802.419.8233
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