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RV Window Leaking Inside: How to Fix This?

Whenever you think of going for a trip, exploring outside, or simply seeking a long-distance adventure; RV undoubtedly is a great option. But the thing is managing an RV isn’t that easy. You’ll face a lot of problems sooner or later and interior window leaks are one of them. 

It happens for a few reasons including poor installation, sealant issues, wear and damage, etc. For quick fixes, you can secure a garbage bag, clear window drip slots, use Flex Seal to patch small gaps, or re-caulk deteriorated seals. These solutions offer short-term and long-lasting protection against RV window leaks.

I’ve brought all the essential information you may need to successfully overcome this problem and make your RV a better living place. All you need to do is stick to the post till the end.

RV Window Leaking Inside

Why the RV Window Leaks: Common Causes

RV window leaks can be frustrating, with multiple culprits at play. Poor installation and sealant issues, like inadequate initial setup and sealant degradation, are prime suspects. Accumulated dirt in drip slots worsens matters. Additionally, damage and wear and tear from cracked windows to UV-damaged seals and condensation are key contributors. Understanding these causes is vital for effective solutions.

Poor Installation and Sealant Issues

Inadequate Initial Installation

One of the primary culprits behind RV window leaks is a shoddy initial installation. Windows may not have been fitted correctly in the first place, creating gaps for water to sneak in.

Sealant Degradation Over Time

As time goes by, the sealant around your windows may deteriorate. Exposure to the elements, UV rays, and weather conditions can make the sealant lose its grip, allowing water to find its way into your cozy RV.

Drip Slots Become Filled with Dirt

Dirt and debris tend to find their way into the drip slots of your RV windows. When these slots clog up, water can no longer escape properly, and it might start leaking indoors. It’s like having a blocked drain in your RV’s “bathroom.”

Damage and Wear and Tear

Cracked or Damaged Windows

RV windows, like any other component, can suffer damage. A rogue rock or an unfortunate encounter with a low-hanging branch can result in cracked or damaged windows. These cracks are like tiny invitations to rainwater.

Seal Deterioration Due to UV Exposure

The sun’s harsh UV rays can be a window seal’s worst enemy. Over time, it can cause the seals to weaken, crack, and lose their waterproofing abilities, making your RV vulnerable to leaks.

Condensation-Related Leaks

Condensation happens when warm, moist air inside your RV meets the cold surface of a window. This collision results in water droplets forming on the window’s interior, and it can ultimately lead to leaks.

Condensation may seem harmless, but over time, the accumulated moisture can damage your RV’s interior. It can seep into walls and ceilings, causing unsightly water stains and even mold growth. Not exactly the decor you were going for.

Fixing Interior Window Leaks

Now that I’ve identified the miscreants causing your RV window leaks, let’s discuss how to tackle them effectively.

Repair vs. Replacement

When to Repair a Leaking Window

Before jumping to a replacement, it’s essential to assess if the damage can be fixed. Smaller issues, like minor sealant gaps or small cracks, can often be repaired, saving you both time and money.

Considerations for Window Replacement

For more severe damage, such as large cracks or severely deteriorated seals, replacing the window might be the best solution. It ensures a long-term fix and the integrity of your RV.

DIY Repair Methods

Sometimes, a good cleaning and resealing job can do wonders. Removing old sealant, cleaning the area thoroughly, and applying new sealant can often resolve minor leaks. To make things convenient, here are the relevant fixes in detail – 

Fix 1: Make Use of a Garbage Bag Over the Window(s)

When you need a quick, temporary fix, a garbage bag can come to the rescue.

  • Measure the affected area, ensuring the bag can fully cover it.
  • Cut the garbage bag to the appropriate size.
  • Secure the bag over the leaking area with strong, waterproof tape. Make sure it’s taut and well-sealed.

This method is a short-term solution that can prevent water from entering until you can implement a more permanent fix.

Fix 2: Clean the Window’s Drip Slots

Over time, dirt and debris can accumulate in the drip slots of your RV windows, leading to water pooling. 

  • Gently remove dirt and debris from the drip slots using a small brush or a toothpick.
  • Ensure the slots are completely clear, allowing water to drain freely.

Cleaning the drip slots is a simple and effective way to prevent further leaks and maintain proper water drainage.

Fix 3: Make Use of Flex Seal

Flex Seal is a liquid rubber sealant that can be used to patch up small cracks or gaps around your RV window frames. 

  • Clean the area around the leak thoroughly to remove dirt and loose material.
  • Shake the Flex Seal can well.
  • Apply a generous coat of Flex Seal over the affected area, extending beyond the leak.
  • Allow it to dry according to the product instructions.

Flex Seal forms a durable, waterproof barrier, effectively sealing out leaks. It’s particularly useful for smaller cracks and gaps.

Fix 4: Re-Caulk the Window(s)

When the existing sealant around your RV windows has deteriorated, re-caulking is an effective DIY repair. Follow these steps –

  • Begin by removing the old sealant using a caulk removal tool or a putty knife.
  • Clean the area thoroughly, ensuring it’s free of debris and old sealant.
  • Apply a new bead of high-quality RV sealant evenly around the window frame, filling any gaps or cracks.
  • Smooth the sealant with a caulk finishing tool or a wet finger to create a neat, watertight seal.

Re-caulking provides long-lasting protection against leaks and is a more permanent solution for sealing your RV windows.

NOTE: If you’ve got small cracks, don’t worry. There are repair kits available that can patch them up easily. It’s like giving your RV a tiny band-aid.

Professional Help

If you’re not the DIY type or the damage is beyond your comfort zone, consider seeking professional help. Finding a reliable RV window repair service can save you a lot of headaches.

NOTE: This is all about the causes and fixes. But obviously, there are a lot of other things that you need to consider before applying the fixes. Check them out in the following sections.

Identifying the Actual Problem

Before you attempt to fix the leak, let’s make sure you know what you’re dealing with.

Visible Signs of Interior Window Leaks

Water Stains and Streaks

Water stains and streaks on the interior surfaces of your RV are the telltale signs of a window leak. They’re like nature’s way of saying, “Hey, you’ve got a problem.”

Damp or Moldy Interior Surfaces

If you’ve noticed any dampness or mold growth inside your RV, it’s a clear indicator that water is making its way in. Mold is not only unsightly but can also pose health risks.

Pinpointing the Source of the Leak

Inspecting Window Frames and Seals

The first step in identifying the source of the leak is to inspect the window frames and seals. Look for gaps, cracks, or signs of wear and tear.

Testing for Gaps and Drafts

On a windy day, you can use a simple tissue test to check for gaps and drafts around the windows. Hold the tissue near the window’s edges, and if it flutters, you’ve got a draft.

DIY Leak Assessment

Gathering the Necessary Tools and Materials

First of all, make sure you have the right tools and materials on hand. A caulking gun, sealant, cleaning supplies, and safety gear are essential.

Safety Precautions

Whenever you’re working on your RV, ensure you’re using appropriate safety gear, and be cautious when climbing or using tools at heights.

Examining Interior Surfaces

Start by examining the interior surfaces for water stains, streaks, or signs of dampness. This will help you pinpoint the general area of the leak.

Inspecting Exterior Window Seals

Head outside and inspect the window seals for any visible damage or deterioration. Pay close attention to the sealant used around the edges.

Checking for Gaps and Drafts

To check for gaps and drafts, wait for a breezy day. Hold a tissue near the window edges and see if it flutters. If it does, you’ve got a gap to fix.

Preventing Future Leaks

Now that you’ve fixed your RV window leaks, let’s discuss how to prevent them in the first place.

Proper Maintenance

Regular Inspections

Regularly inspect your RV’s windows for any signs of wear and tear. Catching issues early can prevent them from turning into major leaks.

Cleaning and Resealing Schedule

Maintain a cleaning and resealing schedule for your RV windows. This will help ensure that the sealant remains in good condition.

Weatherproofing Your RV

Using Protective Covers

Protective covers for your RV’s windows can shield them from the elements, preventing damage and potential leaks.

Installing Window Awnings

Window awnings not only provide shade but also help divert rainwater away from your windows, reducing the chances of leaks.

Tips for Minimizing Condensation

To reduce condensation-related leaks, consider using dehumidifiers inside your RV. Also, ensure proper ventilation to keep the air moisture levels in check.

End Note

When you think of RV adventures, a leaking window can be a real party pooper. But with the right knowledge and a bit of elbow grease, you can fix the issue and ensure your travels remain dry and enjoyable. Remember, addressing interior window leaks is not just about keeping water out; it’s about keeping the good times in. And needless to say, all the aforementioned information will definitely get you out of this mess. So, keep hassle-free RVing, happy RVing!

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