How to Deal with an RV Window Leak

Dealing with an RV window leak can be tricky, but it's a common issue that many RV owners face. In this guide, we’ll walk you through the potential causes of window leaks and how to troubleshoot them. From checking the seals to cleaning debris from weep holes, we've got the steps you need to fix the problem and protect your RV.

1. Common Signs of an RV Window Leak
2. Causes of RV Window Leaks
3. RV Window Leak Repair & Troubleshooting
4. Preventing Future Leaks 

Before diving into solutions, it’s important to recognize the symptoms of an RV window leak. Here are three common indicators:

1. Water pooling on the inside of the windowsill.
2. Water running down the inside of the ventilation sash.
3. Water leaking between the window’s fixed pane glass and the window frame.

If you see any of these signs, it’s time to inspect your RV’s windows for the source of the leak. 

While it’s tempting to assume the window itself is the culprit, sometimes the leak is due to other factors, such as:

• External fixtures like lights or awnings causing leaks that mimic window issues.
• A mismatch between the window and the RV’s wall cutout.

That’s why it's essential to inspect thoroughly before deciding to replace the window entirely. 

1. Check for debris: Most RV windows have weep holes to allow water to drain out during rainstorms or vehicle washes. Over time, dirt and debris can block these holes, leading to leaks. Use a stiff wire or pipe cleaner to clear out the weep holes at the bottom of the window. 

2. Inspect the window seal: Ensure the window’s seals are intact. For sliding windows, check that the latches and interlocking parts are secure and not cracked. If the knob or sash is damaged, it may prevent a tight seal, causing water intrusion. 

3. Examine the rubber glazing: The rubber glazing around the window is primarily cosmetic, but gaps between the windowpane and frame can lead to leaks. If you notice any gaps, apply a bead of 100% silicone to seal them. Once dry, replace the rubber glazing. 

4. Check the clamp ring: The clamp ring that secures the window to the RV wall must be the correct thickness. If it’s too thin or too thick, it won’t create a proper seal, allowing water to get in. Double-check the clamp ring to ensure it’s the right fit for your RV. 

5. Inspect the window fitment: If the window doesn’t match the cutout in your RV’s wall, it can cause leaks. The proper distance between the window frame and the wall cutout should be 1/8 inch on all sides, with a 3/16-inch radius in the corners. If the window isn’t installed properly, you may need to adjust the fit or replace the window. 

To prevent future RV window leaks, make sure to:

• Regularly inspect weep holes for blockages.
• Check window seals and latches for signs of wear and tear.
• Avoid high-pressure water directly on windows during cleaning.

By following these steps and staying proactive, you can reduce the likelihood of an RV window leak and keep your vehicle in top condition. 

Disclaimer: These photographs, recommendations, and approximations are intended for demonstration purposes only and do not reflect the specifications of any particular tow vehicle, recreational vehicle, or trailer. Always consult the manufacturer’s Owner's Manual.