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2 Windows same hole
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Hey there. I was wondering if anyone has any knowledge or experience with 2 double pane windows in the same hole? I have a house built in 1920 with a double foundation basement/cellar. Outside is concrete block and inside is brick. The total wall thickness is a foot or more. Currently there is old single pane windows with storms in there. Come spring, I'm planning on sealing the outside, adding XPS foam board, and stuccoing. While I have the chance I'm going to change out the windows. I know the R value of even double pane argon filled windows is only 3-4. I was thinking of having 1 window on the side of the hole closest to the outside, about an 8 inch gap, and then another on the inside. This would give 2 double pane windows 6-8 R-value plus 8 inches dead air space. Pretty good insulation for a window opening. Just wondering if anyone has done this or has any thoughts or can see any pitfalls. Thanks!


Of course I've done many Google searches, but they all come up with posts about double pane glass and dual booting windows and Linux. Doh!


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`86 Volkswagen Jetta NA: 9 Gallon Marine Tank>Transmission Cooler Tank Heater>TIH>FPHE>Coolant Wrapped Veg Filter>2, 3 Port Hydraforce Valves>Temp. Probe>Line Heater Specialist Injector Line Heaters>Vegtherm on Return>"Crud Catcher">Loop

Everyone Should Read "Ishmael" by Daniel Quinn
 
Location: Woodstock, IL | Registered: May 28, 2006Reply With QuoteReport This Post
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Any gap greater than 5/8 inch is not a dead air space. Convection currents strip the heat off the warm pane and deposit the heat on the cold pane.
There should be no moisture between the two double glazed units, or moisture allowed to get trapped in the air space.
I suggest using aluminum glazing spacers and glazing tape to make a quad pane unit with a 1/2 - 5/8 gap between the two double pane units. Mount the quad pane unit in a frame with the window on the warm side, seal the unit into the frame with silicone sealant. Use spray foam sealant between the frame and the block wall.

Commercial size double pane units are commonly available at a fraction of the cost of finished windows. Making quad pane units like I described is often used on low energy houses in the frigid North.



 
Location: coldest N.America | Registered: May 03, 2005Reply With QuoteReport This Post
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Thanks for the reply. I always thought that any unventilated space would "count" as dead air space and act as insulation...thats why the open air studs behind old lathe and plaster walls would be mediocre insulation?

Anyway, we have 4 windows in the basement. 2 each on 2 parallel walls. I want to make sure at least 1 one each side can open incase it needs to be vented or aired out. We do have outside access via a cellar door (or cellar bulkhead..) but you never know. The 2 inoperable windows I was just planning on using unfinished windows.

For the operable windows I was hoping to find simple manually operated push/pull awning windows. The one nearest the outside wall would push out and the one inside would pull in. What if I were to install them right next to each other so the frames touch (of course sealed with foam and caulk)? When closed should be 1/2 - 3/4" space.

Now I'm thinking, I could also do sliders. It may be good to do the awnings as a possible escape route if ever needed though...


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`86 Volkswagen Jetta NA: 9 Gallon Marine Tank>Transmission Cooler Tank Heater>TIH>FPHE>Coolant Wrapped Veg Filter>2, 3 Port Hydraforce Valves>Temp. Probe>Line Heater Specialist Injector Line Heaters>Vegtherm on Return>"Crud Catcher">Loop

Everyone Should Read "Ishmael" by Daniel Quinn
 
Location: Woodstock, IL | Registered: May 28, 2006Reply With QuoteReport This Post
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