Cleaning out moisture between window panes

Anyone actually ever see the before and after results of some of the window repair companies that do this. There are a few local companies that offer this with warranty… drill small holes in the pane, clean the fog/condensation, install one-way valves in the holes and then bring the r-value somewhat near to the original argon gas. If anyone has had any work done involving this let me know. I’d like to give this as a possible correction rather than having brand new windows installed.


If you know thwe manufacturer of the window, its cheaper to order just a top or bottom sash. You will usually find a tag either on the sash itself or if you lower the top sash it’s on the frame above it. Sometimes they are on the screen frame. Some sashes depending on their brand can either be ordered from a local Home Depot, Lowe’s, or local dealer at a fraction of the cost. I’ve seen some go for $30-$60 depending on size and options in them.

I’m told the repair is temporary, so a waste of money. FE, If the original seals were blown by heat from the sun, the little plugs don’t stand much of a chance, IMO.
I would never recommend a repair, leave that for the realtor. :stuck_out_tongue:

I tell clients that the glass panes can be replaced, rather than pulling the whole frame out. Also point out if it’s a removable slider, these can be brought to the glass shop to have the panes replaced.

John Kogel

This repair system really does work!:mrgreen:

I’ve seen several windows repaired this way and it’s a lot cheaper than replacing a window or sash.

In actual fact the seals are never “blown” Silicate is installed between the panes under the spacer strip when the window is manufactured. The silicate becomes saturated, over time, and looses it ability to absorb the condensation between the panes.

This repair method allows the moisture to escape from the space between the panes and it also allows the silicate to dry out. Therefore no more foggy windows.

True… the argon goes away as well but you can see outside :smiley:

I do mention the process whenever I come across foggy thermopane windows.


Thanks for the info guys. I had a realtor ask me about this process when I came across some fogged over panes.


Jeffrey, two things I’ve noticed, 1 The older thin designs fog up a lot. 2 The most often fogged windows are those on the south and west sides of the house. My theory is that the gas expands in the heat and blows the seals. Then moist air gets sucked in when the panes cool. I repeat, that’s my theory. :stuck_out_tongue:

John Kogel

Anybody have a link for one or two of these outfits?
Is there a guarantee?

Found a link to video of them cleaning between the panes.

Bob… here’s one outfit that’s in our area.


Cost is 1/2 to 2/3 of new window, has a 20 year limited (whatever that means)warranty and I don’t think it works on tempered glass.

The problem is not blown seals, but saturated desiccant behind the aluminum strip.
Thermal pumping caused by the space between panes expanding when the sun hits it and contracting when it cools introduces moisture-carrying air into the area between the panes. That’s why windows in sunny areas tend to fail first. The pumping action is more extreme.
The desiccant eventually becomes saturated and moisture condenses on the panes.

This fix includes removing stains from the double panes and evaporating moisture from the desiccant. With the desiccant dry, it should be good to go for a while as long as the holes can be plugged sufficiently.

I have literally taken these types of windows apart. If they have been stained for any length of time, they WILL NOT come clean. The water stains on the glass WILL NOT come off. Maybe if they are repaired very early on, immediately after the first sign of water stains, they might come clean. BUT not after any length of time.

I think you’re right Charles. We should get a vendor posting here telling us just what they can and can’t do. Why don’t you find us a good one, please.

Here are a couple of National companies that will repair thermal windows that have condensation issues.

IMO, I would simply remove the sash in question, and bring it to my local window installer. I had one thermal pane replaced last year and it cost me $80.00. Compared that price to the price of removing the condensation.

The repair choice is obvious.


How’s it going Bud?

Just to give an update so everyone is aware as to how these panes do actually fail. The desiccants do become saturated (as Kenton mentioned) but it is not the only reason why thermal panes fail. It is definitely a contributing factor but the seals also fail due to the deterioration and breakdown of the adhesive sealant which then allows warm and cold air to infiltrate the air space between the sealed layers of glass. This seal can be compromised during the manufacturing process, movement of the sash while it is in warehouse or even during the shipping and installation process.

Thanks, Kenton. That sounds like a blown seal to me. :stuck_out_tongue: I expect this pumping action to be hard on the little plugs they put in, resulting in moist air between the panes again, saturating the dessicant. That looks like a temporary fix to me. :stuck_out_tongue:

John Kogel

Many of the Moisture Removals that are done on Windows do work! And if they don’t these guys back that up too! *Familiar firsthand with process


There are a few in different parts of the country, the technology and process originally came from Canada.

Some seals on the Insulated Glass Units are not able to handle the cleaning/drying agents, if someone doesn’t know the different types of seals that were used… the chemical agents used will eat up the seal.

In all, I’ve seen a few of these done and it works pretty well.


Hey Dave! Doing well, thanks.
I went to that link and looks like I’m wrong again, or at least half wrong, DOHHH! :freaked-:

That just gets me when they show a before and after picture and they are different houses.:roll:

Never seen it where a van looks further away the closer you get to the window. Plus there is a bush on the left of the left tree in the after picture but not in the before picture.

Reminds me of Jay Leno where they show the fat white man before he took these diet pills then they showed (supposable) the same man skinny. The only problem is that the skinny man was black.

I asked the Glass Gurus to post. If they do, I guess they better be able to answer the questions. If they don’t, I guess we’ll have a pretty good idea that they don’t dare expose themselves to tough questioning.

Drying out the dessicant doesn’t seem that difficult. Providing a warranty might be harder.

You can tell that they photo shopped this image. Look at the curtain at the top of the image. They blurred the “Before” image to make it look worse.