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Old 12-28-2013, 08:59 AM   #1
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Repairing Vinyl Window Seals


I'm having a bit of air leakage around the sliding sections of my double hung vinyl windows. On both the frame and window is a felt (?) material that is supposed to seal the sliding areas of the window. Over time I suppose the felt material degrades and no longer provides a complete seal.

Can this material be replaced? How would you reseal the window and still allow it to slide up and down in the window frame?

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Old 12-28-2013, 11:42 AM   #2
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Repairing Vinyl Window Seals


Weatherstripping can be changed in some windows. Others it is not serviceable.

What type and manufacturer of window?

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Old 12-28-2013, 12:11 PM   #3
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Repairing Vinyl Window Seals


+1. Pics would help if you dont know the window brand.
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Old 12-30-2013, 06:54 AM   #4
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Repairing Vinyl Window Seals


The windows were manufactured by a local company which has been out of business for many years. I'll take a few pictures post them.

Thanks.
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Old 01-25-2014, 07:40 AM   #5
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Repairing Vinyl Window Seals


Sorry for the delay. Another project took priority.

Here are three pictures of the window felt. The most air infiltration is at the channel where the window slides.

Can the felt be replaced? If so, how do you determine what size to order?
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Repairing Vinyl Window Seals-004.jpg   Repairing Vinyl Window Seals-008.jpg   Repairing Vinyl Window Seals-009.jpg  
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Old 01-25-2014, 11:26 AM   #6
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Repairing Vinyl Window Seals


That weather stripping is fine.

The reason for the air in the balance channel is because of the design of the sill.

Ask for some chimney blocks for the balance channels.
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Old 01-25-2014, 12:07 PM   #7
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Repairing Vinyl Window Seals


The window manufacturer is no longer in business. Is there a generic product that will work?

I did a few searches on balance channel chimney block but get links to fireplace chimney products. Is there another term for the air blocks or do you have a link to something that will work.
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Old 01-25-2014, 12:41 PM   #8
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Repairing Vinyl Window Seals


You can cut some generic foam to fit in there just fine.
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Old 01-25-2014, 03:59 PM   #9
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Repairing Vinyl Window Seals


Where exactly should I place the blocking foam?

I'm thinking in the sliding window's side channel. There is a channel 3/4" wide and runs the height of the window. I believe the home improvement stores carry variable width insulating foam. Shouldn't be to difficult to cut a strip for each side and see what it does.
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Old 01-25-2014, 05:46 PM   #10
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Repairing Vinyl Window Seals


Correct. In the channels and at the base. No need to put more than about 3/4" total height and cut the foam to fit the dimensions of that channel.
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Old 01-26-2014, 01:25 PM   #11
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Repairing Vinyl Window Seals


Found MD closed cell high density foam at Lowes. Best choice was 3/16" thick x 3/8" wide. Had to place two strips side by side to fill the 3/4" channel. I cut the strips 3" long.

A full 3/4" wide by 1/4" thick would have been the best option but so far what I found is sealing out the air. Cost $1.68 plus tax. So for under $2.00 I have fixed the problem. Not sure why the window company did not do the same. Maybe that's why they are out of business.

I may also add more under the window where it meets the sill if necessary.

First picture shows the window frame channel with the plastic that covers the string. With the window closed, the foam seals against the plastic about 2 inches of the total 3 inch length.

Second pictures shows the two foam strips in the window channel.

Thanks for the help WoW!
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Old 01-27-2014, 11:32 AM   #12
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Repairing Vinyl Window Seals


I would cut and install the foam in the bottom of the channel as well.
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Old 01-27-2014, 03:48 PM   #13
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Repairing Vinyl Window Seals


I could add foam there also, but I don't believe it would stop air.

If you look at the last picture I posted you will see a channel in the outer frame where the string is. That channel runs all the way down to the sill. It's not covered with plastic like the top section.

Foam in the window channel will do nothing to stop air in the outer frame channel. Again, strange/cheap design?

Or, maybe I'm not seeing what you're referring to.
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Old 01-28-2014, 07:12 AM   #14
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Repairing Vinyl Window Seals


I think you are missing what I am saying.

Foam in that channel at the bottom will stop/slow the chimney draft.
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Old 01-28-2014, 06:53 PM   #15
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Repairing Vinyl Window Seals


Now I get it. Thanks WoW.

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