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Insulation R Values

American Ingenuity's component panel contains seven inch thick rigid Expanded Bead Polystyrene (E.P.S.) insulation which has an R value of 28. (The 22' dome's insulation is 3 1/2" thick E.P.S.)    The seven inch thick insulation is comparable to eleven inch thick fiberglass batting. Remember there is no wood in the American Ingenuity Dome shell to interrupt the insulation or to rot or to be eaten by termites. A temporary wooden rib system is utilized to support the panels during the larger dome assembly (36' thru 60') until all the seams between the panels and the entryways and dormers are concreted and then the system comes down.  The dome is self supporting.  To view a file that covers the rib system, click on Rib.  Smaller dome assembly can be accomplished using radial supports.  To view this explanation, click on Radial.

Those individuals that live in areas that have five days or more of zero degree temperatures may want to purchase the Ai Dome Kit with nine inch thick, R 36 insulation.

Insulation Information

The following insulation information came from this web site:   http://www.ineed2know.org/

1. What’s the benefit of insulating my home?

  • Insulation can help reduce the cost of your heating and cooling bills by preventing the flow of heat into your house in the summer time and reducing the flow of heat out of your home in the winter time. In short, you can save money.

2. What’s the most important thing to know about insulation?

  • Its "R-value." The R-value of an insulation product gages the resistance the insulation has to the flow of heat.The higher the R-value, the better the product will resist heat flow. R-values are standardized, so you can compare different brands and types of insulation, and still know their relative ability to resist heat flow.

3. How can I be sure the R-value of an insulation is accurate?

  • Insulation R-values are regulated by the Federal Trade Commission. Manufacturers must label their insulation packages, installers and stores must provide you with fact sheets, and new home sellers must include R-value information in their sales contracts.


R-Value Table

The following R-Value Table came from the web site:

http://www.allwallsystem.com/design/RValueTable.html

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.

********

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

********

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 Bat

 

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 Bat

3.14

 


Fiberglass Blown (attic)

2.20

 


Fiberglass Blown (wall)

3.20

 


Rock Wool Bat

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

2x4 (3 1/2")

 


4.38

2x6 (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

 

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