Studies and Experts Prove Saving Windows is Better
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johnleeke
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PostPosted: Fri Oct 30, 2009 9:42 am    Post subject: Studies and Experts Prove Saving Windows is Better Reply with quote

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Do any of you know of data, research, studies or informed opinions that demonstrate the potential or realized improvement in reduced energy use for wood window restoration or augmentation, such as storm windows and weatherstripping.


Here are some of the most useful:

Measure Guideline: Wood Window Repair, Rehabilitation, and Replacement
Research Report - 1203, 2 December 2012, by Peter Baker
This guideline provides information and guidance about rehabilitating, retrofitting, and replacing wood window assemblies in residential construction. It is intended primarily to help contractors and homeowners understand the options for safely improving the performance of their wood windows. Has particularly good illustrations.
http://www.nrel.gov/docs/fy13osti/55219.pdf

Saving Windows, Saving Money: Evaluating the Energy Performance of Window Retrofit Vs. Replacement, National Trust for Historic Preservation, 2012
"The results of this study show that window retrofit and replacement options
have the potential to significantly improve the energy efficiency of a home with existing leaky, single-pane windows. How much varies substantially among retrofit options, energy costs, and climate variations. Several retrofit options fall into the range of expected performance that a replacement window might achieve (specifically exterior and interior storm windows, especially when combined with cellular shades), showing that retrofit options should be a first consideration before replacements." -- Conclusion from the report.
Webpage:
http://www.preservationnation.org/information-center/sustainable-communities/green-lab/saving-windows-saving-money/#.UdQsVPKaYUU
Direct link to the report: http://www.preservationnation.org/information-center/sustainable-communities/green-lab/saving-windows-saving-money/120919_NTHP_windows-analysis_v3lowres.pdf

Effects of Energy Efficiency Treatments on Historic Windows, by Larry Kinney and Amy Ellsworth at The Center for Resource Conservation, Colorado, Jan. 2011
Testing methods and results for storm windows and weatherstripping.
http://www.conservationcenter.org/assets/EffectsEnergyonHistoricWindows.pdf

A Comparative Study of the Cumulative Energy
Use of Historical Versus Contemporary Windows, Frank Shirley, Fred Gamble, Jarod Galvin, December 3, 2010. "This study compares the life-cycle costs of two residential window systems in a pre-1940 house in Boston, Massachusetts. One is an original double-hung window with a new triple-track storm unit. The other is a new, vinyl, double-hung replacement window. Our results are obtained from an algorithm that yields the total present value of all costs associated with a window system over its entire life, including acquisition, installation, maintenance, and energy. Our study provided two notable findings: (1) the thermal performances of the two window systems are similar; and (2) taking all costs into account, it is more cost effective to add a storm window to an historical window, and it remains so at all times for the full 100-year life we considered."
http://www.frankshirleyarchitects.com/FSA%20-%20Comparative%20Window%20Study.pdf

Saving Energy in Historic Buildings: Balancing Efficiency and Value,
John H. Clver and Brad Randall, 2010
An energy model on a rehab project which shows that the energy savings of replacement windows versus restored & stormed windows is virtually identical. When analyzed as a return-on-investment, the replacement windows actually never show a return.
http://www.apti.org/publications/Past-Bulletin-Articles/Cluver-Randall-41-1.pdf

Measured Winter Performance of Storm Windows, Lawrence Berkeley National Labs, 2002.
http://escholarship.org/uc/item/05p5881m
Tests during actual winter weather conditions show that adding low-E storm windows gave performance similar to replacement windows, and infiltration did not reduce the performance significantly.

Storm Windows Save Energy
Although new, high-performance windows are the ideal, simply putting up storm windows in the wintertime
can be a very effective alternative. By Colleen Turrell, from Home Energy Digest.
http://web.archive.org/web/20101125034420/http://homeenergy.org/archive/hem.dis.anl.gov/eehem/00/000711.html
This is a testing method for windows that includes air infiltration as well as thermal energy flow. Any assessment that does not consider thermal energy flow as well as infiltration is incomplete.

Thermal Performance of Traditional Windows,
Paul Baker, Historic Scotland, 2008, 2010.
http://www.historic-scotland.gov.uk/thermal_performance_of_traditional_windows_2010.pdf
"Secondary glazing was the most effective overall option, as it reduced heat loss through the window by 63%. Timber shutters are the most effective option of the traditional methods, reducing heat loss by 51%; curtains reduced heat loss by 14%; a Victorian roller blind reduced heat loss by 28%; a modern roller blind reduced heat loss by 22%. The greatest reductions in heat loss came from combining these measures (i.e. blinds, shutters and curtains all closed)"

Field Evaluation of Low-E Storm Windows, a study done on Chicago bungalows in 2005.
http://www.ornl.gov/sci/buildings/2010/Session%20PDFs/22_New.pdf
Energy Update Newsletter with a review of the study:
http://www.focusonenergy.com/files/Document_Management_System/Extranet/energydesignupdatefeb08_newsletter.pdf


Window Condensation in Historic Buildings..., National Research Council Canada.
http://www.nrc-cnrc.gc.ca/eng/ibp/irc/ctus/ctus-n5.html

JLC Report, Can Replacement Windows Live
Up to Energy Claims? (Feb. 2010)
"If the existing windows were in good condition — even if they were no better than single-glazed windows with fitted storms — their high-tech replacements are unlikely to pay for themselves in energy savings during their lifetime. "
http://www.jlconline.com/cgi-local/viewnew.pdf/0/725e61f19016c81b4f90e1f51448f6a3/www.jlconline.com/cgi-bin/jlconline.storefront/4b7ad66f1d19066927170a32100a0628

William Hill, building scientist, demonstrates the 400 year payback on replacement windows:
http://www.scribd.com/doc/20481724/Replacement-Windows-and-Furnaces-in-the-Heartland-Hill-1990

Improving the Thermal Performance of Traditional Windows, from Scotland:
http://www.historic-scotland.gov.uk/thermal-windows.pdf

Research into the Thermal Performance of Traditional Windows, 2009, English Heritage Proves Saving Windows Better than Replacing: summary with good quotes, all the window repair methods, scientific methods and data complete, very easy to understand.
http://www.climatechangeandyourhome.org.uk/live/research_generic.aspx

Window of Opportunity: A Three-Part Master Course on Windows in Traditional Settings, Course #2 with John Leeke and Walter Sedovic (live presentation July 2009, recording now available, be sure to listen through to the Q&A session at the end, free but you have to register and give your contact info which may be used for marketing)
http://www.traditional-building.com/windowwebinars/

A windows tip sheet from the National Trust for Historic Preservation.
http://www.ohp.parks.ca.gov/pages/1054/files/july2008windowstipsheet.pdf

“Measured Winter Performance of Storm Windows”
http://www.ohp.parks.ca.gov/pages/1054/files/berkeley%20storm%20window%20research.pdf

“Building Regulations and Historic Buildings: balancing the needs for energy conservation with those of building conservation”
http://www.ohp.parks.ca.gov/pages/1054/files/english%20heritage%20interim_guidance.pdf

“Repair or Replace Windows in Historic Buildings: Arriving at a Sustainable Solution”
http://www.ohp.parks.ca.gov/pages/1054/files/heritage%20canada.pdf

“Life Cycle Of Window Materials - A Comparative Assessment”
http://www.ohp.parks.ca.gov/pages/1054/files/uk%20window%20frame%20lca.pdf

“Domestic Retrofitting Strategies in the UK: Effectiveness vs. Affordability”
http://www.ohp.parks.ca.gov/pages/1054/files/domestic%20retrofit%20uk.pdf

“What Replacement Windows Can’t Replace: The Real Cost of Replacing Historic Windows”
http://www.ohp.parks.ca.gov/pages/1054/files/replacement_windows%20sedovic%20gotthelf.pdf

“Testing the energy performance of wood windows in Cold Climates”
http://www.ohp.parks.ca.gov/pages/1054/files/testing%20windows%20in%20cold%20climates.pdf

“Lincoln Hall Windows Research Report: A Case Study of Options for Treatment for Windows at Lincoln Hall, University Of Illinois, Urbana Champaign” http://www.illinoishistory.gov/ps/Lincoln%20Hall%20Window%20Life%20Cycle%20Study%202008%20%20Univ.%20of%20Illinois%20at%20Urbana%20Champaign.pdf

Let us know if you learn of any others.

_________________
John

by hammer and hand great works do stand
by pen and thought best words are wrought


Last edited by johnleeke on Wed Jul 03, 2013 9:01 am; edited 28 times in total
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woodturner



Joined: 23 May 2006
Posts: 73
Location: Western Pennsylvania

PostPosted: Tue Feb 16, 2010 12:38 pm    Post subject: Support from an unexpected source Reply with quote

Found this in the JLC newsletter today:
"If the existing windows were in good condition — even if they were no better than single-glazed windows with fitted storms — their high-tech replacements are unlikely to pay for themselves in energy savings during their lifetime. "

http://www.jlconline.com/cgi-local/viewnew.pdf/0/725e61f19016c81b4f90e1f51448f6a3/www.jlconline.com/cgi-bin/jlconline.storefront/4b7ad66f1d19066927170a32100a0628
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Uchmar



Joined: 20 May 2010
Posts: 8

PostPosted: Fri May 28, 2010 5:53 pm    Post subject: Reply with quote

In this article:
“Domestic Retrofitting Strategies in the UK: Effectiveness vs. Affordability”
http://www.ohp.parks.ca.gov/pages/1054/files/domestic%20retrofit%20uk.pdf
Autor advocates for cavity insulation (wall cavity if I got it correctly). But this is wrong, isn't it?

Insulating ventilated cavities should result in condensation, no matter if this is a wall cavity or a cavity in the double window (two separated glass panels).
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jade



Joined: 11 Feb 2005
Posts: 785
Location: Hawley MA

PostPosted: Fri May 28, 2010 8:11 pm    Post subject: Reply with quote

uchmar welcome to the site...i've read, with interest, your other two posts...

yes, indeed, filling the weight cavity with insulation or otherwise blocking venilation can lead to condensation and mold growth...

even those with the best intentions can share misguided information...

...jade
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johnleeke
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PostPosted: Tue Feb 08, 2011 4:50 pm    Post subject: Reply with quote

Another late breaking study:

Effects of Energy Efficiency Treatments
on Historic Windows, by Larry Kinney and Amy Ellsworth at The Center for Resource Conservation, Colorado
Testing methods and results for storm windows and weatherstripping. Jan. 2011
http://www.conservationcenter.org/assets/EffectsEnergyonHistoricWindows.pdf

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johnleeke
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PostPosted: Wed Feb 09, 2011 6:02 pm    Post subject: Reply with quote

Randall replies:

John,
Thanks you for the email showing the technical spec proving old windows restored meet current energy standards.
Is their any formal documentation of the work standards and methods used that met those energy standards? I would love to review materials used, method etc. If we use the same methods, it would guarantee our results, every time
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Yours
Randall Marder
RM Design & Construction Inc.
37 years experience in historic preservation
http://www.rmdesignconst.com
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johnleeke
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PostPosted: Wed Feb 09, 2011 6:08 pm    Post subject: Reply with quote

Randall:

There are some details in the study's report. The authors' contact info is in there, so you could get in touch with them to see if there are further details.

The contractor who did the work is a window specialist there in Colorado, so I suppose you could contact them to see if they will share more of the details of the work.

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johnleeke
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PostPosted: Sun Jun 02, 2013 12:11 pm    Post subject: Guideline: Window Repair, Rehabilitation and Replacement Reply with quote

Measure Guideline: Wood Window Repair, Rehabilitation, and Replacement
Research Report - 1203, 2 December 2012, by Peter Baker
This guideline provides information and guidance about rehabilitating, retrofitting, and replacing wood window assemblies in residential construction. It is intended primarily to help contractors and homeowners understand the options for safely improving the performance of their wood windows. Has particularly good illustrations.
http://www.nrel.gov/docs/fy13osti/55219.pdf

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by hammer and hand great works do stand
by pen and thought best words are wrought
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