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RV Repair by Custom way in California > FAQ > RV Roof Bubble
rv roof bubble

RV Roof Bubble

🧐 What Is an RV Roof Bubble?

An RV roof bubble is a raised, swollen area on your RV’s roof—usually found on rubber membranes like EPDM or TPO. It can range in size from a few inches to several feet and may feel soft or air-filled when pressed.

It’s not just a cosmetic issue. A bubble in your RV roof is often a warning sign of improper adhesion, trapped air, or even water damage beneath the roofing membrane.

🛻 Why You Might See an RV Roof Bubble While Driving

If you’ve noticed a roof bubble forming while driving, it’s likely due to:

  • Wind pressure getting under a poorly adhered membrane

  • Heat expansion as your roof heats up at highway speeds

  • Existing delamination that gets worse with movement

This is especially common on older RVs or roofs that were poorly installed or repaired.

Important: A roof bubble that lifts or flaps while driving can eventually tear, leading to major leaks and expensive damage.

🔍 Common Causes of RV Roof Bubbles

  1. Bad Adhesive or Application – The membrane wasn’t fully glued during installation or repair.

  2. Heat and Expansion – Hot weather causes the rubber to expand, creating blisters.

  3. Moisture Under the Roof – Trapped water or humidity under the membrane causes swelling.

  4. Age and Wear – Older roofs naturally lose adhesion and begin to bubble or delaminate.

🔧 How to Fix Bubble in RV Roof: Step-by-Step

If you’re wondering how to fix a bubble on your RV roof, the method depends on whether it’s a dry bubble (air only) or a wet bubble (with moisture inside).

✅ Small Air Bubbles (No Moisture)

These are mostly cosmetic but still need attention if they grow over time.

Steps:

  1. Clean the roof area with RV roof cleaner.

  2. Press the bubble down gently.

  3. Apply a heat gun briefly (low setting) to help the rubber shrink slightly.

  4. Use RV roof sealant (lap sealant or silicone) around the bubble’s edges to prevent air intrusion.

⚠️ Large or Moisture-Filled Bubbles

These must be opened and resealed properly.

Steps:

  1. Cut open the bubble carefully with a utility knife.

  2. Check for mold, wet insulation, or rot—dry out the area completely.

  3. Clean and scrape off old adhesive.

  4. Re-glue the membrane using EPDM or TPO-approved adhesive.

  5. Apply a patch or use a specialized RV roof bubble repair kit.

  6. Seal the repair with lap sealant or RV silicone roof coating.

🧰 Recommended RV Roof Bubble Repair Kit

If you’re not comfortable cutting and gluing, a roof bubble repair kit can save time. Look for:

  • EPDM or TPO compatibility

  • Self-adhesive patches

  • Seam rollers

  • Lap sealant

Popular kits: Dicor Rubber Roof Repair Kit, Eternabond RoofSeal, or Camco Roof Patch Tape.

🛡️ RV Rubber Roof Bubble Repair: Prevention Tips

  • Check your roof at least every 90 days.

  • Re-seal seams, vents, and skylights yearly.

  • Use high-quality self-leveling RV silicone or lap sealant.

  • Park in shade or under a cover to reduce heat damage.

  • After major rain, inspect for signs of swelling or bubbles.

A bubble in your RV roof might seem harmless at first, but it can grow into a serious issue if ignored. Whether you’re dealing with a roof bubble while driving or a minor air pocket from poor installation, addressing the problem early helps protect your investment.

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