DIY RV Foggy Window Repair: A Step-by-Step Guide

RV foggy windows are a common problem that many RV owners face. Foggy windows can be frustrating as they obstruct the view and make the RV look unattractive. Luckily, there are ways to repair foggy windows without having to replace them entirely. DIY RV foggy window repair is an affordable and straightforward solution that can be done at home.

DIY RV foggy window repair can save RV owners a significant amount of money compared to replacing the windows entirely. By following the correct steps and using the right tools, RV owners can repair their foggy windows themselves without having to pay for professional services. 

We’ll go through the step-by-step process of ridding your RV of foggy windows in this guide.

What Causes Foggy Windows

foggy frameless rv window
Foggy RV windows are usually caused by a broken seal.

Foggy windows in an RV are a common problem that many RV owners face. The main reason RV windows fog up is due to broken window seals between the two layers of glass.

These seals are supposed to keep air and moisture from getting between the two panes of glass. When the seal is compromised, outside air and moisture can seep in, causing condensation and foggy windows.

The Impact of Foggy Windows on Your RV

Foggy windows not only look unappealing but can also have a negative impact on your RV. The moisture that gets trapped between the two panes of glass can cause damage to the window frame and walls of your RV. This can lead to expensive repairs and replacements down the line.

Additionally, foggy windows can affect the insulation of your RV. The trapped moisture can reduce the insulating properties of the window, causing your RV to become less energy-efficient. This can lead to higher heating and cooling costs and an uncomfortable living environment.

It is essential to address foggy windows as soon as possible to prevent further damage to your RV and maintain a comfortable living environment.

DIY RV Foggy Window Repair

Materials Needed

Before starting the repair process, it is important to have all the necessary tools and materials. Here is a list of the items you will need:

  • Ladder
  • Painter’s tape
  • Butyl tape
  • #2 Phillips head screwdriver
  • #2 Robertson head bit
  • Flat head screwdriver
  • Putty knife
  • Plastic Trim Removal Kit
  • Carpet shield adhesive plastic sheet
  • Oscillating saw with a knife blade
  • The correct window pane spacer for your RV windows
  • Acetone

Step-by-Step Guide to Repairing Foggy Windows

Repairing foggy windows in an RV can be a daunting task, but with the right tools and materials, it can be done at home. Here is a step-by-step guide to repairing foggy windows:

  1. Remove the window from the RV by unscrewing the screws that hold it in place.
  2. Place the window on a flat surface and remove the screws that hold the frame together.
  3. Carefully separate the two panes of glass from the frame.
  4. Clean the inside of the glass panes with acetone and a clean cloth to remove any dirt or debris.
  5. Apply butyl tape to the spacer and place it on the inside of one of the glass panes.
  6. Place the other glass pane on top of the spacer and press down firmly to ensure a tight seal.
  7. Reassemble the frame and place the window back in the RV.

Tips and Tricks for Successful DIY RV Foggy Window Repair

Here are some tips and tricks to keep in mind when repairing foggy windows in an RV:

  • Make sure to order the correct spacer for your RV windows to ensure a proper fit.
  • Use painter’s tape to protect the surrounding area from scratches or damage during the repair process.
  • Be gentle when separating the glass panes from the frame to avoid cracking or breaking the glass.
  • Clean the glass panes thoroughly before reassembling to ensure a clear view.
  • Apply pressure evenly when reassembling the glass panes and frame to ensure a tight seal.

When to Call a Professional

foggy rv window

While DIY RV foggy window repair can save you money, there are times when it’s best to call a rv window repair specialist. Here are some signs that you need professional help:

Signs That You Need Professional Help

  • If your RV windows are severely fogged up, it may be a sign of a more serious problem. A professional can help diagnose the issue and provide a solution.
  • If your RV windows have cracks or chips, it’s best to leave the repair work to a professional. Attempting to fix the damage yourself could make it worse.
  • If you don’t have the necessary tools or experience to repair your RV windows, it’s best to call in a professional. They have the expertise and equipment needed to do the job right.

Choosing the Right Professional for Your RV Foggy Window Repair

When choosing a professional for your RV foggy window repair, it’s important to do your research. Here are some things to consider:

  • Look for a professional with experience in RV window repair. They will have the knowledge and expertise needed to get the job done right.
  • Check reviews and ratings online to get an idea of the professional’s reputation. Look for reviews from other RV owners to see if they have had success with the professional in question.
  • Ask for a quote before agreeing to any work. Make sure the quote includes all costs associated with the repair, including labor and materials.
  • Make sure the professional is licensed and insured. This will protect you in case of any accidents or damage during the repair process.

Overall, if you’re not comfortable with repairing your RV windows yourself or if the damage is too severe, it’s best to call in a professional. They have the expertise and equipment needed to get the job done right.

Preventing Foggy Windows in the Future

After repairing your RV’s foggy windows, it’s important to take measures to prevent them from fogging up again in the future. Here are some tips:

Maintenance Tips

Regular maintenance is key to preventing foggy windows. Make sure to keep your RV’s windows clean and dry, especially during rainy seasons. Check the seals around the windows for any cracks or gaps and replace them as needed. It’s also important to keep the humidity levels inside your RV low, as high humidity can cause condensation on the windows.


If you’re looking for a more long-term solution, consider upgrading your RV’s windows. Dual-pane windows with gas-filled insulation are less likely to fog up and can provide better insulation for your RV. You can also opt for windows with tinted or reflective coatings to reduce the amount of heat that enters your RV, which can also help prevent condensation.


If your RV’s windows are beyond repair, it may be time to replace them. When choosing new windows, look for high-quality materials and make sure they are installed properly to prevent any future leaks or gaps. It’s also important to choose windows that are the right size and shape for your RV to ensure a proper fit.

Check out our other RV window repair guides while you’re here:

How to open an RV emergency window from the outside

RV window glazing bead replacement

RV skylight replacement guide

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