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Old 09-20-2012, 10:43 AM   #1
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Finishing a Basement Window


I'm finishing my basement, using 2" extruded foam insulation on the exterior walls held up by furring strips, and screwing drywall directly into the furring strips. The idea as I understand it is to cover all concrete surfaces with the foam, preventing any condensation on the concrete and keeping any moisture seeping in through the concrete from collecting or touching any wood, etc.

What I'm not clear on is how to frame a window without any wood or drywall touching the concrete, and what to do with condensation from the metal window frame.

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Old 09-22-2012, 10:18 AM   #2
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Finishing a Basement Window


Nobody? I see plenty of step by step instructions for putting up rigid foam, furring strips and drywall in a basement, but when it comes to windows the most I find is "frame around the edges of the windows with furring strips. "

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Old 09-22-2012, 10:23 AM   #3
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Finishing a Basement Window


Post a picture so we can see what you have to work with.
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Old 09-22-2012, 07:59 PM   #4
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Finishing a Basement Window


If the new wood box frame is against a metal frame, add some electricians tape to the contact edge against vapor wicking.

The inside of the box should have 1/4" reveal to the window frame edge (inside). Add some 2x2 or deep enough wood under the box frame, on the outside edge, for apron backing to attach. As Joe said, really hard to guess without pictures...

Here are some head/sill details to give you an idea (though your app. is different w. f.b. inside); http://www.mtcc1170.com/images/BCRainScreen.pdf

"Outie" window; http://www.buildingscienceconsulting...se_Studies.pdf

Be sure to air-seal the frame to other existing wood, if possible, leave a small air space at the drywall/foam board as pictured in one link.

Gary
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Old 09-23-2012, 04:06 PM   #5
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Finishing a Basement Window


Thanks, I'm not quite following at the moment, but I'm reading the forum on my phone right now, so I'll try again tomorrow when I can sit down and focus on it better.
This is about as good of a picture as I could get down there.

Last edited by MrAngles; 09-24-2012 at 08:43 AM.
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Old 09-24-2012, 09:18 AM   #6
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Finishing a Basement Window


Ok sorry for the giant image I originally posted above. The edited version should be easier to look at.
Quote:
Originally Posted by GBR in WA View Post
If the new wood box frame is against a metal frame, add some electricians tape to the contact edge against vapor wicking.

The inside of the box should have 1/4" reveal to the window frame edge (inside). Add some 2x2 or deep enough wood under the box frame, on the outside edge, for apron backing to attach. As Joe said, really hard to guess without pictures...
So far the plan is to use 2x3 furring strips over the 2" XPS foam. I guess the first question is how close should I frame around the window? I originally just assumed that I would put the foam and the furring strips right over the flat metal edge of the window frame that is set into the concrete like this.

Looking at the picture now and reading what you're saying, maybe what I should actually be doing is leaving some extra room, something more like this:

Grey is concrete, Pink is the 2" foam insulation, Brown is the 2x3s, White is the windowframe and sheetrock. In this diagram I could fill the half inch between the top furring strip and the metal window frame with spray foam, cover most of that with the sheetrock and seal the rest of the gap from the sheetrock to the windowframe with caulk? Would that look odd with the sort of stairstep edge the window has?

Last edited by MrAngles; 09-24-2012 at 09:22 AM.
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Old 09-28-2012, 09:25 PM   #7
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Finishing a Basement Window


Bump.
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Old 09-29-2012, 10:02 PM   #8
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Finishing a Basement Window


As long as the trim gives the window a reveal step, choose the best for the eye. Just make sure the trim is air-sealing the foam board so no air gets to the concrete to condense there.

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Old 10-01-2012, 11:14 AM   #9
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Finishing a Basement Window


Ok, that makes sense. Thank you!

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