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Old 06-18-2013, 03:43 PM   #16
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Window flashing question


There are very few things in construction that can only be done one way. Window installs: there are probably 50 different opinions on what is correct.
If you are really concerned with the thermal break, you can save money by dropping down to 1x stock for the trim and laminate the backside with 1/4" foam.

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Old 06-18-2013, 04:25 PM   #17
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1/4" foam does nothing for a thermal break. by the time the trim in installed the foam will compress rendering it useless for any r-value.. 1" is the bare minimum to achieve any actual thermal performance
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Old 06-18-2013, 04:48 PM   #18
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My coffee cup seems to provide a thermal break between the 190F liquid and my hand and that's only maybe 1/16" thick.
I'm just saying I would feel more comfortable mounting the windows to something solid rather than 1" of foam for the benefit of the r-value of few extra inches of foam board. Plus you don't have to worry that the trim needs to align to each adjacent piece as the foam compresses when you install. From a homeowner perspective, ease of installation is a factor.
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Old 06-18-2013, 04:59 PM   #19
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as a contractor who promotes a home built to a higher level of energy efficiency its a major factor. and if you install the window how i mentioned youll never have issues. ive istalled thousands of windows. .. the only time weve had issues with a window was when it had a manufacturing defect. . the nails throught the nailing flange keep it level and plumb in combination with shims. the hurricane straps hold it tight to the wall

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