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Old 03-31-2013, 10:03 PM   #1
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Reframing windows on brick knee wall


In my sunroom that sits on concrete slab, I have a 2ft high with 8"wide brick knee wall, that currently extremely hot or cold due to no insulation and very thin windows that sit on top of brick wall. I wanted to reframe and replace windows with new windows and insulate wall space around them ideally but was unsure about how to attach sill plate to brick or if I should demolish brick wall altogether and reframe from the concrete to roof. Any help is appreciated.
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Old 03-31-2013, 10:37 PM   #2
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Reframing windows on brick knee wall


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Originally Posted by Mikeymannii2 View Post
...or if I should demolish brick wall altogether and reframe
But the extra $100 ($200?) a year for heat and a/c as it is...
will cost a LOT less than the rebuilding.

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Old 04-01-2013, 09:44 AM   #3
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Reframing windows on brick knee wall


Thanks but I'd like the room to more comfortable ad would constantly have to have a heater or a/c unit running if I left it the way it is. It's quite uncomfortable right now and space that doesn't get used because of the conditions.
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Old 04-01-2013, 10:38 AM   #4
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Reframing windows on brick knee wall


You don't really need to make or attach a sill section.

It should be integral to any new window that you order for that opening.
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Old 04-01-2013, 10:50 AM   #5
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Reframing windows on brick knee wall


I would fur out the interior of the wall with 1-1/2" rigid polyiso insulation and gyp. bd. the interior.

This will only buy you a little more R-value, but with replacement of the windows to a more efficient type will help keep the room a bit better insulated.

If space isn't a constraint, you could also build a new 2x wall on the interior of the brick and utilize some batt insulation for even more efficiency. Both of these options allow for easy finishing of the casement around the new windows including the sill.

The only word of caution is to verify the dew point of the revised wall construction dependent on your geo-graphical location to ensure that condensation won't be an issue if you air-condition this room.
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