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 Post subject: GBG - what's the performance impact?
PostPosted: Thu Mar 31, 2016 5:10 pm 

Joined: Sat Mar 19, 2016 11:05 am
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Just curious - how much impact to performance does GRG (grids between glass) make in a window compared to no grids? I suspect it's negligible but would like to confirm. I'm asking as window ratings are typically based on units without grids as that is the optimal performance setup. But, since my home currently has grids, I'll probably run them top & bottom in the replacements to keep the architectural style intact (leaning toward Okna).


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 Post subject: Re: GBG - what's the performance impact?
PostPosted: Thu Mar 31, 2016 5:38 pm 
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Joined: Mon Jan 30, 2006 1:32 pm
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Location: Delaware, New Jersey, Philadephia Area
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I've never seen it change the overall u-factor in reference to the NFRC sticker on a window verses a non-grid window. OKNA seems to do a really nice job with their grids in terms of quality control as that's an area in which all manufacturers encounter some small percentage of misalignment during the manufacturing process of the glass.


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 Post subject: Re: GBG - what's the performance impact?
PostPosted: Thu Mar 31, 2016 6:55 pm 
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Joined: Fri Mar 11, 2005 3:58 pm
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Location: Sales and Installation in Chicagoland and Central Illinois
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On pretty much all the brands I've carried it's been a .01 difference. An example would be a .26 with GBG grids, a .25 without GBG grids.


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 Post subject: Re: GBG - what's the performance impact?
PostPosted: Thu Mar 31, 2016 7:28 pm 

Joined: Sat Mar 19, 2016 11:05 am
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Thanks much. That's what I was hoping to hear.


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 Post subject: Re: GBG - what's the performance impact?
PostPosted: Thu Mar 31, 2016 9:47 pm 

Joined: Wed Feb 01, 2012 9:14 pm
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Location: New Jersey Window Pro- Northern NJ and Central NJ
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I dont believe okna is affected by adding grids to their double pane units. At least with the 500 and 800 series .


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 Post subject: Re: GBG - what's the performance impact?
PostPosted: Thu Mar 31, 2016 11:04 pm 
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Joined: Tue Feb 16, 2010 6:14 pm
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Location: Milwaukee, Madison areas
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I've never seen the u factor of an okna window affected by grids. Only vt and shgc for obvious reasons, and only a negligible amount


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 Post subject: Re: GBG - what's the performance impact?
PostPosted: Fri Apr 01, 2016 5:54 am 
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Joined: Wed Apr 04, 2007 11:21 pm
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Location: DC Metropolitan Area-Maryland/Virginia/DC
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I have seen a 0.01 delta one time. Can't remember which window, but that would be the largest offset and it is basically negligible.


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 Post subject: Re: GBG - what's the performance impact?
PostPosted: Fri Apr 01, 2016 2:14 pm 

Joined: Wed Feb 01, 2012 9:14 pm
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Location: New Jersey Window Pro- Northern NJ and Central NJ
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Eric
I seem to recall the 500 series in triple pane going from a .19 to a .20 with grids.


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 Post subject: Re: GBG - what's the performance impact?
PostPosted: Fri Apr 01, 2016 10:06 pm 
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Location: Milwaukee, Madison areas
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masterext wrote:
Eric
I seem to recall the 500 series in triple pane going from a .19 to a .20 with grids.

Good catch Paul. The double pane is is the same with and without, but the triple pane does change by a point according to the nfrc. Probably not an incredibly common combo, but it's there none the less.


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