[Greenbuilding] Adding glass pane to single pane wood windows ?

[Tim Brown]

Condensation is  the big  issue.
Cost of tempered and  laminated    glass  is  a  lot   more.
Don't   think  glass  thickness  is  going  to  help  R  value significantly.
On Oct 25, 2012, at 6:04 PM, Lance Hoffmeyer wrote:

> Hey all,
> 
> My house was build around 1955 and has single-pane wood windows.
> 
> When I first moved in I started adding storm windows to the outside.
> They are very flimsy and a hassle on days like this when I want to
> open windows because I have to go through a four step process:
> open the wood window,  open storm screen, open storm window, close storm screen.
> 
> It occurred to me that I can have glass cut and get holes drilled in it
> that would allow me to attach a second pane of glass to the existing
> sash (frame) of the windows.
> 
> Attaching a second pane to the wood frame would give me almost 1 inch of space
> between the original glass (1/8 inch) and the second pane.
> 
> 
> I am now trying to decide what sort of glass to get.  the options I am considering are
> 
> 1/8 or 1/4 inch
> 
> plain (probably only safe to use 1/4 inch, 1/8 inch may break too easily)
> tempered (same cost 1/8 inch or 1/4 inch)
> laminated (1/4 inch only)
> 
> 
> I am looking for some ideas/help for advantages/disadvantages of these glass types and this
> idea of adding a second pane of glass to the existing windows, in general.
> 
> 
> I imagine R/U value doubles from 1/8 inch to 1/4 inch.
> Don't know if there is any difference in R/U value window benefits for plain vs. tampered vs. laminated.
> Since I will most likely use 1/4 inch glass anyway, I imagine plain glass is cheaper and what I would probably
> purchase unless there is significant R/U value increase in using one of the other types.
> 
> 
> TIA,
> 
> Lance
> 
> 
> 
> 
> 
> 
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