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

[Benjamin Pratt]

Years ago, before I knew any better, I caulked the interior winds shut
and caulked the old fashioned exterior storm winds in place as well.
I must've either done a great job caulking on a dry day because I
never had any condensation form between the windows in the few years I
lived there. (One could hypothesize I did a really bad job caulking,
but I am a good caulker, having worked on home painting and
restoration since i was a teenager.)
Ben

On Sun, Oct 28, 2012 at 10:36 AM, Bob klahn <Home-NRG at dnaco.net> wrote:
> 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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>
>
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-- 


b e n j a m i n p r a t t

professor art+design
the university of wisconsin stout