Wednesday, September 29, 2010

Rant: Home Depot Duct Tape

I quick one this evening, just for the sake of generating content and developing good habits.

I was at the Home Depot a month ago buying supplies for a small HVAC project.  In the midst of looking for proper adhesives and binding substrates for some flexduct and associated boots, I could almost NOT find the appropriate code-approved tape and mastic and webbing and ties.  Sheesh, it was a battle.  Nearly all the tape they had in the aisle was not code approved and probably would have lastly a hot minute on that cold duct (or vice-versa). 

After 5 minutes of careful examination, I find it at the bottom right corner of an array of shiny foil nothing tapes. 

Disappointment reigned.  While code-approved tape probably have more to do with fire=rating than actual adhesive performance, nevertheless, complying with code should not be so hard.  Having ductwork that won’t leak in 1 year wouldn’t be so bad.

On the bright side, as long as folks keep using hat crap, I’ll have more of a retrofit marketing plan

There are a wealth of reports and studies about this, but for the n00b: http://www.lbl.gov/Science-Articles/Archive/duct-tape-HVAC.html

Wednesday, September 15, 2010

Embodied Carbon Footprinting Literature Review

A quick table and chart


Study

Description

Location

Square Footage

Projected Life of Home

Total Embodied CO2 (kg)

Embodied kg CO2/sq. ft.

Operational CO2--50 yr (kg)

Operational kg CO2/sq. ft.-yr

U. Mich[1]

Standard Home

Michigan

2450

50

81,795

33.39

931,486

7.60

U. Mich

Energy Efficient Home

Michigan

2450

50

79,992

32.65

294,463

2.40

CORRIM[2]

Home-Steel Structure

Minneapolis

2062

75

37,047

17.97

1,300,000

8.41

CORRIM

Home-Wood Structure

Minneapolis

2062

75

46,826

22.71

1,300,000

8.41

CORRIM

Home-Concrete structure

Atlanta

2153

75

21,367

9.92

762,500

4.72

CORRIM

Home-Wood structure

Atlanta

2153

75

28,004

13.01

762,500

4.72

Australia[3]

Median

Australia

1773

50

84,900

47.87

507,000

5.72

Australia

Max (Embodied)

Australia

3444

50

164,700

47.82

899,000

5.22

Australia

Min (Embodied)

Australia

980

50

56,800

57.99

238,100

4.86

 

image002

[1] Blanchard, Steven, and Peter Reppe. Life Cycle Analysis of a Residential Home in Michigan. Report (University of Michigan. Center for Sustainable Systems), no. CSS98-05. Ann Arbor, Mich: Center for Sustainable Systems, University of Michigan, 1998. Internet resource.

[2] Life Cycle Environmental Performance of Renewable Materials in the Context of Residential Building Construction: Phase I Interim Research Report. Seattle, WA: Consortium for Research on Renewable Industrial Materials (CORRIM, 2002. Print.)

[3]Pullen, Stephen F. "Energy Used in the Construction and Operation of Houses." Architectural Science Review. 43.2 (2000): 87. Print. This study analyzes 25 homes of all ages and assemblies around Adelaide, Australia. Maxima, minima, and average results were calculated directly from the data provided in the paper.