[MassHistPres] Replacement Windows and a new study

[Dennis De Witt]

Same is true for Brookline, whose guidelines are on the town website.

Its tough to get a good comparison of double glazing and storms.  Historic Scotland has just put out a new technical study of reglazing historic type wood sash with TDL thin section insulating glass and included among their comparisons single glazing with storms.

You can download it from 
http://www.historic-scotland.gov.uk/technicalpapers
and then download technical paper #9.  

It consists of a series of three reports and an executive summary.  Two of them are embedded energy of new glazing.

Figure 4 in Report 3 together with the "Conclusions" of that paper on p.8 shows eight types of double glazing -- with different types of gas fill, etc.  They show a range of reduction of U value for the insulating glass over single glazing ranging from 35% to 63%.  Single glazing with "secondary glazing" (storm window) achieved a 61% reduction.  The best double glazing performance was achieved with an unconventional vacuum fill glazing, which I think is not available in the US.

Dennis De Witt



On May 18, 2011, at 4:01 PM, jworden at socialaw.com wrote:

> We have attempted to deal with this issue by adopting rather detailed guidelines.  Visit our web-site:
> arlingtonhistoricdistrict.com, and go to "guidelines"  Upion opening that you will find the window business
> right near the beginning.
> 
> J. Worden
> Arlington HDC
> 
> 
> 
> ------- Original Message -------
> From : Gretchen Schuler[mailto:ggschuler at verizon.net]
> Sent : 5/18/2011 3:27:30 PM
> To : masshistpres at cs.umb.edu
> Cc : 
> Subject : RE: [MassHistPres] Replacement Windows
> 
> I imagine that every HDC is struggling with requests to replace windows with new modern "energy" windows.  I wonder of any advice you have for the way in which your Commission is addressing such requests for mid to late 20th-century buildings in historic districts.  We are seeing requests for replacement windows that are wood clad on the interior but not on the exterior and of course do not have true divided lites - in fact no muntin profile on the exterior lite. 
>  
> Any advice as to how you are proceeding with such applications will be appreciated, particularly with all the focus on sustainable green development that is energy efficient.  We know what to say for 19th C. windows but are in a bit of a quandry for 1950s to 1970s dwellings - infill within districts - that may not have the advantage of having old windows for which preservation is easier to promote.  
>  
> Thanks,
>  
> Gretchen Schuler
> Wayland HDC
>  
>  
> 
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