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RV Foggy Window Repair: What You Should Know

RV Foggy Window Repair: What You Should Know

In today’s post, we’re taking a look at RV foggy window repair of double pane RV windows.

While fogging won’t affect the function of the window, foggy windows can look bad and may prevent the RV owner from having a clear view out. It may also impact the resale value of the RV.

So, let’s take an in-depth look at how to repair fogged RV windows.

What Causes Foggy RV Windows?

Foggy RV windows are generally caused by window seals that are no longer tight. A good seal between double-paned windows prevents condensation from forming. RV windows fog when that seal is compromised and outside (often moist) air is allowed in.

Foggy dual pane windows are quite common on RVs because the seals that prevent moisture and air from entering between the two panes of glass weaken over time and travel.

It’s important to repair foggy RV windows as soon as they appear if possible. If left long enough, the moisture build-up inside can cause permanent etching of the glass. Once the glass is etched, an easy DIY repair is no longer possible and the window will likely need to be replaced (or at least have the damaged glass removed).

Should you need to replace your RV window completely, you can follow the step-by-step instructions in our post on the topic (or watch this video) to do this as a DIY project:

How to Repair Fogged RV Windows

There are a number of different approaches you can take to repair foggy RV windows. You can either tackle this piece of RV maintenance yourself as a DIY project, or you can send the window out for repair to an RV window repair specialist.

Either way, you’ll need to remove the window (just watch the removal half of the video embedded above ????).

DIY RV Foggy Window Repair

If you decide to repair your fogged RV windows as a DIY project, there are a number of ways you can do this. In a nutshell, what you’ll need to do is the following:

  1. Remove the window from the side of the RV
  2. Remove the two window panes from the frame
  3. Separate the two panes of glass
  4. Clean the glass panes (removing the fog… if they were left too long, and etching has occurred, you may need to use a mild abrasive to re-polish the inside surface(s) to make the glass clear again)
  5. Reassemble and reseal the panes making sure they’re well sealed and dried
  6. Allow time to cure
  7. Reinstall the glass in the frame
  8. Reinstall the window onto the RV
  9. Clean your (now de-fogged) window and enjoy the view!

NOTE: If you choose to buy a kit to complete this project, you’ll need to start by measuring the size of the window in order to know what kit to purchase. You’ll also need to check the space between the two panes of glass. This is usually a distance of 3/16”, but you need to buy a repair kit that has the same spacing. If you don’t, your window may not fit back in where it belongs.

You can purchase a kit from Foggy Window Repair Kits, or you can pick on up on Amazon:

Foggy RV Window Complete 3/16' Seal Repair Kit with Tools and Ten Feet of Seal…
  • This seal is 3/16 inch thick and Ten Feet long
  • This is a Do It Yourself product! On a skill level of 1 to 10, this is a 3 or 4. You'll get a QR Code to scan for the complete video on how to do this...

In addition to either of the above kits, you’ll need ⅛” thick x ⅜” wide closed cell foam double-sided adhesive tape to use for sealing the window frame back to the side of the RV when re-installing the window:

You’ll also want to use one of the following products to seal around the top of the window frame after re-installing:

Dicor Clear Cap Sealant:

Dicor 351CSCL-1 HAPS-Free Cap Sealant - Clear for RV Window and Door Maintenance
  • USE: Paintable sealant helps seal perimeters of RV windows, entry doors, compartment doors, and joints
  • COLOR: Clear material to let your RV surfaces shine through

ProFlex Clear:

Geocel GC28100 Pro Flex RV Flexible Sealant - Clear
  • Flash Point: 93.0 Degrees_Celsius
  • Excellent Adhesion To Many Surfaces, Even When Damp

Here’s a video that might be helpful to you as you consider repairing your RV foggy window repair:

Have You Repaired Fogged Windows On Your RV?

If you’ve completed this project in the past, let us know how it went and what was your chosen method of addressing your foggy windows.

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Friday 4th of August 2023

Glad you brought up this subject! I noticed on my brand new Jayco Eagle 5th wheel huge condensation weep holes? It comes with frameless windows, but every window has a cut out of 3/4” for condensation to drain out? Now explains why I have condensation buildups on some of my lower windows. I guess I will have to purchase a matching foam and fill them all in. Just another issue with Jayco’s poor builds!


Friday 5th of August 2022

Had to replace my driver's side window was NOT a DIY task. As this window was EXTRA LARGE and screws were hidden behind overhead storage compartment asking motorhome mfg.(newmar) for assistance got nowhere, they said to take it to a service center which we ended up doing.


Friday 5th of August 2022

Did you mean to put expediently in your email announcement for the page. You might want to us expeditiously in it's place next time. Look 'em up.


Friday 5th of August 2022

An editing oversight, which we didn't catch until it was too late since the email had already gone out.

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PLEASE NOTE: We're handy RVers, not professional technicians. We're happy with the techniques and products we use, but be sure to confirm that all methods and materials you use are compatible with your equipment and abilities. Regardless of what we recommend, consult a professional if you're unsure about working on your RV. Any task you perform or product you purchase based on any information we provide is strictly at your own risk.

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