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Retrofit Measures for Finished Roof

Here you will find the data for Finished Roof measures available in the National Residential Efficiency Measures Database. Each measure consists of a before-component, an after-component, and the estimated cost to implement the measure. The measures are listed alphabetically based upon the name of the before-component. Where multiple costs are indicated they must be combined to obtain total measure cost (e.g., fixed ($) and normalized ($/sf) costs).

Cost Drivers

There are many factors that influence the ultimate cost of Finished Roof measures. The application of the average measure costs displayed below to any particular home is discouraged. Examples of the kinds of issues that can influence the cost of Finished Roof measures include:

Prevailing local wages
Drive time
Local code requirements
Roof slope
Access
Presence/condition/type of existing insulation
Existing construction and materials
Moisture issues present
Condition of existing electrical system
Presence of hazardous materials

Insulate with Open Cell Spray Foam:

Before-Component

After-Component

Cost

Uninsulated, 2x10

Properties:

Cavity Depth: 9.25 in
Cavity Insulation Nominal R-value: h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: False

Lifetime:

999 Years

R-33 Open Cell Spray Foam, 2x10

Properties:

Cavity Depth: 9.25 in
Cavity Insulation Nominal R-value: 33.0 h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: True

Performance Standards:

Exceeds IECC 2009 (3A, 2C, 2A, 3B, 2B, 1C, 1B, 1A, 3C)
Exceeds IECC 2012 (1A, 1C, 1B)

Lifetime:

999 Years

Measure Cost

Units	Range	Average
$/ft^2 Roof	3.7 - 8.3	6.4

Insulate with Loose Fill:

Before-Component

After-Component

Cost

Uninsulated, 2x10

Properties:

Cavity Depth: 9.25 in
Cavity Insulation Nominal R-value: h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: False

Lifetime:

999 Years

R-38 Fiberglass, 2x10

Properties:

Cavity Depth: 9.25 in
Cavity Insulation Nominal R-value: 38.0 h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: True

Performance Standards:

Exceeds IECC 2009 (2A, 3B, 2C, 3A, 1B, 1A, 3C, 2B, 1C)
Meets IECC 2009 (4C, 5A, 5B, 4A, 4B, 5C)
Exceeds IECC 2012 (1B, 1A, 1C)
Meets IECC 2012 (2A, 3B, 2B, 2C, 3A, 3C)

Lifetime:

999 Years

Measure Cost

Units	Range	Average
$/ft^2 Roof	3.3 - 7	5.4

Insulate with Closed Cell Spray Foam:

Before-Component

After-Component

Cost

Uninsulated, 2x10

Properties:

Cavity Depth: 9.25 in
Cavity Insulation Nominal R-value: h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: False

Lifetime:

999 Years

R-60 Closed Cell Spray Foam, 2x10

Properties:

Cavity Depth: 9.25 in
Cavity Insulation Nominal R-value: 60.0 h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: True

Performance Standards:

Exceeds IECC 2009 (4C, 6A, 8, 6B, 5A, 3A, 6C, 2C, 4B, 5C, 3C, 1A, 7, 1B, 1C, 5B, 4A, 2B, 3B, 2A)
Exceeds IECC 2012 (4C, 6A, 8, 6B, 5A, 6C, 2C, 3A, 3C, 5C, 1A, 4B, 1B, 7, 1C, 5B, 2B, 4A, 3B, 2A)

Lifetime:

999 Years

Measure Cost

Units	Range	Average
$/ft^2 Roof	5.8 - 13	9.9

Insulate with Loose Fill:

Before-Component

After-Component

Cost

Uninsulated, 2x12

Properties:

Cavity Depth: 11.25 in
Cavity Insulation Nominal R-value: h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: False

Lifetime:

999 Years

R-49 Fiberglass, 2x12

Properties:

Cavity Depth: 11.25 in
Cavity Insulation Nominal R-value: 49.0 h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: True

Performance Standards:

Exceeds IECC 2012 (2A, 3B, 2B, 1C, 1B, 1A, 3C, 2C, 3A)
Exceeds IECC 2009 (2A, 4C, 3B, 1A, 3C, 4B, 5C, 2C, 3A, 5A, 2B, 5B, 4A, 1C, 1B)
Meets IECC 2012 (6A, 4C, 5A, 5B, 4A, 6B, 7, 8, 4B, 5C, 6C)
Meets IECC 2009 (6A, 6C, 6B, 7, 8)

Lifetime:

999 Years

Measure Cost

Units	Range	Average
$/ft^2 Roof	4.2 - 9	6.9

Insulate with Loose Fill:

Before-Component

After-Component

Cost

Uninsulated, 2x4

Properties:

Cavity Depth: 3.5 in
Cavity Insulation Nominal R-value: h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: False

Lifetime:

999 Years

R-13 Fiberglass, 2x4

Properties:

Cavity Depth: 3.5 in
Cavity Insulation Nominal R-value: 13.0 h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: True

Lifetime:

999 Years

Measure Cost

Units	Range	Average
$/ft^2 Roof	1.1 - 2.5	1.9

Insulate with Loose Fill:

Before-Component

After-Component

Cost

Uninsulated, 2x6

Properties:

Cavity Depth: 5.5 in
Cavity Insulation Nominal R-value: h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: False

Lifetime:

999 Years

R-19 Fiberglass, 2x6

Properties:

Cavity Depth: 5.5 in
Cavity Insulation Nominal R-value: 19.0 h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: True

Lifetime:

999 Years

Measure Cost

Units	Range	Average
$/ft^2 Roof	1.7 - 3.5	2.7

Insulate with Open Cell Spray Foam:

Before-Component

After-Component

Cost

Uninsulated, 2x6

Properties:

Cavity Depth: 5.5 in
Cavity Insulation Nominal R-value: h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: False

Lifetime:

999 Years

R-20 Open Cell Spray Foam, 2x6

Properties:

Cavity Depth: 5.5 in
Cavity Insulation Nominal R-value: 20.0 h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: True

Lifetime:

999 Years

Measure Cost

Units	Range	Average
$/ft^2 Roof	2.3 - 5.2	4

Insulate with Closed Cell Spray Foam:

Before-Component

After-Component

Cost

Uninsulated, 2x6

Properties:

Cavity Depth: 5.5 in
Cavity Insulation Nominal R-value: h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: False

Lifetime:

999 Years

R-36 Closed Cell Spray Foam, 2x6

Properties:

Cavity Depth: 5.5 in
Cavity Insulation Nominal R-value: 36.0 h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: True

Performance Standards:

Exceeds IECC 2009 (2C, 3A, 3B, 2A, 1C, 2B, 1A, 3C, 1B)
Exceeds IECC 2012 (1C, 1B, 1A)

Lifetime:

999 Years

Measure Cost

Units	Range	Average
$/ft^2 Roof	3.6 - 8	6.1

Insulate with Open Cell Spray Foam:

Before-Component

After-Component

Cost

Uninsulated, 2x8

Properties:

Cavity Depth: 7.25 in
Cavity Insulation Nominal R-value: h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: False

Lifetime:

999 Years

R-26 Open Cell Spray Foam, 2x8

Properties:

Cavity Depth: 7.25 in
Cavity Insulation Nominal R-value: 26.0 h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: True

Lifetime:

999 Years

Measure Cost

Units	Range	Average
$/ft^2 Roof	2.9 - 6.7	5.1

Insulate with Loose Fill:

Before-Component

After-Component

Cost

Uninsulated, 2x8

Properties:

Cavity Depth: 7.25 in
Cavity Insulation Nominal R-value: h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: False

Lifetime:

999 Years

R-30 Fiberglass, 2x8

Properties:

Cavity Depth: 7.25 in
Cavity Insulation Nominal R-value: 30.0 h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: True

Performance Standards:

Meets IECC 2012 (1A, 1B, 1C)
Meets IECC 2009 (2A, 2C, 3A, 1A, 3C, 1B, 1C, 2B, 3B)

Lifetime:

999 Years

Measure Cost

Units	Range	Average
$/ft^2 Roof	2.6 - 5.5	4.3

Insulate with Closed Cell Spray Foam:

Before-Component

After-Component

Cost

Uninsulated, 2x8

Properties:

Cavity Depth: 7.25 in
Cavity Insulation Nominal R-value: h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: False

Lifetime:

999 Years

R-47 Closed Cell Spray Foam, 2x8

Properties:

Cavity Depth: 7.25 in
Cavity Insulation Nominal R-value: 47.0 h-ft^2-R/Btu
Continuous Insulation Nominal R-Value: h-ft^2-R/Btu
Continuous Insulation Thickness: in
Framing Factor: 0.07 frac
Insulation Fills Cavity: True

Performance Standards:

Exceeds IECC 2012 (1B, 3C, 1A, 2B, 1C, 2A, 3B, 3A, 2C)
Exceeds IECC 2009 (1B, 5C, 1A, 3C, 4B, 2B, 5B, 4A, 1C, 5A, 3A, 2C, 4C, 2A, 3B)

Lifetime:

999 Years

Measure Cost

Units	Range	Average
$/ft^2 Roof	4.6 - 10	7.9