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<div><font size="4">What kind of glazing do you use. </font></div>
<div> </div>
<div><font size="4">I am interested in using inexpensive storm
windows as you describe to improve the performance of
common standard and existing windows. If frame can be
light and narrow, the visual impact would be minimized. I
see the design task as making the stops to receive the
storm sash. </font></div>
<div> </div>
<div><font size="4">Eli </font><br>
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Hi,<br>
Depending on the existing window frame, one simple way to add an
interior storm with essentially no visual impact is to just cut a
piece of clear Acrylic to the size of the full window inside opening
so that it sits against the fixed part of the window frame. Example
here:
<a class="moz-txt-link-freetext" href="http://www.builditsolar.com/Projects/Conservation/acrylicstormwindow.htm">http://www.builditsolar.com/Projects/Conservation/acrylicstormwindow.htm</a><br>
<br>
I've since dropped the Velcro in favor of 4 small screws that to
through the Acrylic into the Vinyl of the window frame. You
literally cannot see storm window at all. We also use the same
technique on our odd shaped kitchen windows that are nearly 5 ft
wide with triangular tops. The Acrylic I used in the pictures is
1/8 inch thick, but a bit thicker would probably be better in terms
of holding it in place with a minimum number of screws.<br>
<br>
Lots of inside storm window designs here:
<a class="moz-txt-link-freetext" href="http://www.builditsolar.com/Projects/Conservation/conservation.htm#WindowTreatments">http://www.builditsolar.com/Projects/Conservation/conservation.htm#WindowTreatments</a><br>
<br>
Gary<br>
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<div>-----Original Message----- </div>
<div>From: Corwyn </div>
<div>Sent: Sunday, October 28, 2012 6:24 PM </div>
<div>To: Green Building </div>
<div>Subject: Re: [Greenbuilding] Airtight windows </div>
<div> </div>
<div>On 10/28/2012 1:20 PM, Sacie Lambertson wrote:</div>
<div>Our windows are starting to condensate at the base on the</div>
<div>> inside. Many of you have suggested this is the
penalty of winter.</div>
<div>> Isn't there anything I can do about it?</div>
<div> </div>
<div>See my previous suggestion for interior storm windows.</div>
<div> </div>
<div>Here's the basics of when you will get condensation.
When the dewpoint </div>
<div>temperature of the inside air is a the same as (or
greater than) the </div>
<div>temperature of the inside surface of the windows (or
anything else in </div>
<div>your house), that surface will condense water. So in
order to avoid </div>
<div>condensation you need to either lower the dewpoint of the
air inside, by </div>
<div>reducing the humidity, or increase the temperature of the
inside surface </div>
<div>of the windows.</div>
<div> </div>
<div>Whether the humidity is too high is a matter of
perspective and some </div>
<div>controversy. Get a humidity gauge and measure what yours
is. Generally </div>
<div>somewhere in the 40% - 60% range is recommended, but
balance is between </div>
<div>being too dry (and the dry throat and colds that that
produces) and </div>
<div>being too wet and the mold and mildew (and the allergies
that </div>
<div>aggravates), so decide for yourself. That said, lowering
the humidity </div>
<div>will reduce the condensation (and vice versa). One of
the things we </div>
<div>generally see is that as people increase the air
tightness of their </div>
<div>house they need to go from worrying about too low
humidity to worrying </div>
<div>about too high humidity. At that point, you are probably
in the place </div>
<div>where you will need to have supplemental ventilation (for
fresh air </div>
<div>reasons), and an HRV will take care of the humidity
issue.</div>
<div> </div>
<div>The other way is to raise the temperature of the glass.
Traditionally </div>
<div>this was done by putting the central heating output right
under the </div>
<div>windows so that hot air washed over the surface warming
it up. Now, the </div>
<div>solution is generally to increase the insulation value of
the windows. </div>
<div>The interior storm windows are a cheap way to do this,
adding about R-2 </div>
<div>to a window for about $1.50 per square foot (if you make
them yourself), </div>
<div>I make them for around $4.00 per square foot. Raising
the temperature </div>
<div>of the glass will also increase comfort levels (even at
the same air </div>
<div>temperature.</div>
<div> </div>
<div>Thank You Kindly,</div>
<div> </div>
<div>Corwyn</div>
<div> </div>
<div> </div>
<div>-- </div>
<div>Topher Belknap</div>
<div>Green Fret Consulting</div>
<div>Kermit didn't know the half of it...</div>
<div><a class="moz-txt-link-freetext" href="http://www.greenfret.com/">http://www.greenfret.com/</a></div>
<div><a class="moz-txt-link-abbreviated" href="mailto:topher@greenfret.com">topher@greenfret.com</a></div>
<div>(207) 882-7652</div>
<div> </div>
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