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

[Bob klahn]

Lance,

One guideline that hasn't been implied but not stated in any reply I've 
read is that whatever approach you choose, the innermost pane must be 
the air-tightest to limit condensation.  The old "rule of thumb" was 
five times tighter than subsequent panes, if there is any leakage.  This 
allows any leakage (drying) to be to the outside.

Bob Klahn
On 10/25/2012 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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