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 Post subject: Sliding window replacement
PostPosted: Wed Aug 24, 2016 10:03 pm 

Joined: Wed Aug 24, 2016 7:58 pm
Posts: 6
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Hi. I will be replacing an old, totally failing sliding window that is about 71 inches by 63 inches.

What I really want is a quiet window that is installed correctly and works well.

I am strongly considering a Pella 350 series with 3mm and 5mm window pane thickness for sound dampening purposes. It has a pretty decent STC rating of 32. The Air Infiltration of 0.06 strikes me as reasonable.

The knock I have read about the Pella 350 series is that it uses a pocket sill for drainage - but does that matter with a sliding window? Do all siding windows use pocket sill designs?

The cost for the offset option with a full tear out install (the existing stool has a bunch of rot from the failed window) is ~$1,500. Pella's product warranty seems OK but the labor warranty is only 2 years.

I have also gotten quotes for:
1) Simonton 5500 Reflections with laminated glass. A full tear out install is $1,840, normal install $1,590. Don't know the STC on this configuration yet, but the installer does warrant labor for the length of Simonton's product warranty which is a little longer than Pella's.
2) Okna Precision Weld - $1,700 with laminated glass (Installer said Okna does not do STC testing for their units). I think their labor warranty is 3 years. I'm a little bit unsure of this installer because they really seem to have few reviews online, which strikes me as strange given they say they have been in business for 34 years.

One question I have is how important is a full tear out install vs. a standard install, given the stool rot I have? Also, in this day and age, is it normal not to have many customer reviews on line?

I'd welcome any other of your thoughts or advice!


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 Post subject: Re: Sliding window replacement
PostPosted: Thu Aug 25, 2016 6:59 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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You are correct that most slider windows are pocket sill designs.

Seems like the numbers are all pretty good in this application and the fact that it is a slider largely eliminates the pocket sill concern with their other operators.

The only concerns I would have would be the QA/QC of the product and installation. If you are comfortable with both of those things, no reason your rationale isn't sound.


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 Post subject: Re: Sliding window replacement
PostPosted: Thu Aug 25, 2016 8:27 am 

Joined: Wed Feb 01, 2012 9:14 pm
Posts: 666
Location: New Jersey Window Pro- Northern NJ and Central NJ
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Personally i think the pella 350 double hungs have a very cheap look to them and appeared flimsy. I have never seen their sliders but cant imagine them being that much better than their double hungs. As for the Okna, they recently upgraded their sliders with a new monorail system called EZ glide or something or other. Its a really nice feature and definitely enhances the operability of their slider.
As far as STC ratings, most manufacturers use the same laminated glass thickness so those numbers will be relatively similar. The real difference would be in the air infiltration and structural ratings.


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 Post subject: Re: Sliding window replacement
PostPosted: Thu Aug 25, 2016 2:28 pm 

Joined: Wed Aug 24, 2016 7:58 pm
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Sorry for the initial cross post on this board, but there seems to be more activity hereā€¦

The Pella looks like a vinyl window to me, as does the Okna. The rep showed me the Okna's nice brass rollers, and of course the Pella has plastic ones, although the Pella does not have visible big joint seams.

I don't know jack about window installation, so I have as much comfort that Pella would install the window as well or as poorly as anybody else.

Any thoughts on either a) the need for a full tear-out installation and b) an installer/dealer with a pretty invisible presence on the internet (other than 4 fairly recent BBB complaints) from happy or unhappy customers?


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 Post subject: Re: Sliding window replacement
PostPosted: Thu Aug 25, 2016 8:09 pm 
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Joined: Mon Jan 30, 2006 1:32 pm
Posts: 849
Location: Delaware, New Jersey, Philadephia Area
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I think that Pella is having most of the welds to the interior polished or sanded to give sort of a seamless appearance which is a nice touch. I've never installed the 350 series and probably never will as we offer much more revered vinyl offerings. I think Pella is still utilizing PPG Intercept on the 350 in terms of spacer glazing? That weeping pocket sill on their DH is the "kiss of death" in my opinion. The slider should be fine, however I would expect it to be bulky extrusion wise. Certified Pella installers from one of their retail stores should be at higher standard I would think install knowledge and experience wise.

I like the OKNA sliders regardless of the series. I've not had a problem with one yet.


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 Post subject: Re: Sliding window replacement
PostPosted: Fri Aug 26, 2016 9:51 am 

Joined: Wed Feb 01, 2012 9:14 pm
Posts: 666
Location: New Jersey Window Pro- Northern NJ and Central NJ
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The fact that pella are using plastic rollers should tell how much pella ignores quality when it comes to their vinyl products. I woukd never offer something with plastic rollers.
Makes you wonder what else they cut corners with.


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 Post subject: Re: Sliding window replacement
PostPosted: Fri Aug 26, 2016 10:07 am 
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Joined: Tue Feb 16, 2010 6:14 pm
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Location: Milwaukee, Madison areas
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Where are you located (regionally) and what are the thermal ratings on that Pella? Honestly I have not seen that recently... Wondering if they achieve the .27 u factor needed for the northern region Energy Star without a using "cheater"(my word) glass packages like 366 or surface 4 low e?

Okna does, Simonton does in casements but not sliders or double hungs. Not sure about that Pella.


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 Post subject: Re: Sliding window replacement
PostPosted: Fri Aug 26, 2016 3:27 pm 

Joined: Wed Aug 24, 2016 7:58 pm
Posts: 6
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HomeSealed wrote:
Where are you located (regionally) and what are the thermal ratings on that Pella? Honestly I have not seen that recently... Wondering if they achieve the .27 u factor needed for the northern region Energy Star without a using "cheater"(my word) glass packages like 366 or surface 4 low e?

Okna does, Simonton does in casements but not sliders or double hungs. Not sure about that Pella.


I am in the North-Central region. U = 0.28, SHGC = 0.28, VLT = 53%.


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 Post subject: Re: Sliding window replacement
PostPosted: Fri Aug 26, 2016 6:09 pm 

Joined: Wed Aug 24, 2016 7:58 pm
Posts: 6
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masterext wrote:
The fact that pella are using plastic rollers should tell how much pella ignores quality when it comes to their vinyl products. I woukd never offer something with plastic rollers.
Makes you wonder what else they cut corners with.


Simonton also uses plastic rollers, I believe. Who else besides Okna has non-plastic rollers on their sliding windows?


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 Post subject: Re: Sliding window replacement
PostPosted: Tue Aug 30, 2016 4:59 pm 

Joined: Sun Feb 22, 2009 5:52 pm
Posts: 1669
Location: SE PA & NJ; CT
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Since you have a price for an Okna slider with laminated glass why not go with that.
The E z glide is an option on the Okna, I would suggest it based on your unit size.

I am a certified Pella installer using their product for 30 years. I would not recommend Pella for a multitude of reasons.


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