How to Check Your RV for Leaks

Water damage to your motorhome can cost thousands of dollars to repair. Prevention is simple, you think, right? Once you see water dripping through into the interior, you get up on the roof, apply some Liquid Roof to the trouble spot, and all is well again. Unfortunately, it’s not always that simple.

When a leak develops on your RV roof, the water may travel unnoticed in the area between the roof and the ceiling, dripping down into the walls and causing damage which may not be detected until you’ve got a very expensive problem on your hands. Inspecting the roof isn’t enough – you’ve got to go through the entire motorhome to see if there are any areas which show signs that water is getting in. Then you’ll be able to trace it back to the source and treat the roof with liquid roof to prevent further problems.

How to look for water damage in your RV:

Inspect the roof – Visually inspect all the seams, flashing, and areas around protrusions like antennae for cracked or damaged caulking and other gaps as well as soft spots or discoloration. Any problem areas can be cleaned and fixed with repair tape and liquid roof.

Check inlets – Examine the areas where the furnace, shower, water inlet, etc. come into the inside of the RV and make sure there are no signs of water damage.

Inspect the walls – Check for soft spots, discoloration, or wrinkles on the walls, particularly around doors, windows, slide-outs, and vents.

Inspect inside cabinets – Pay special attention to the area where the top inside corners of the cupboards meet the ceiling.

Check the cab-over – This area is often vulnerable in Class C motorhomes. Be sure to feel underneath the mattress for any soft spots.

Check for delamination – Stand at one end or the other on the outside of the RV and see if there are any ripples or irregularities in the shape of the fiberglass along the sides. This can be an indication that water has gotten between the outside of the motorhome and the walls.

Don’t forget storage – Inspect the insides of the exterior storage compartments for signs of water damage.

Once you’ve conducted a thorough inspection of your RV, you’ll need to address any issues by locating the source of the leak so that you can repair the roof damage with liquid roof.

In order to locate the leak, you can have an RV shop perform a smoke test, or you can conduct an air pressure test at home. This is achieved by blocking all vents and other places where air can escape and creating a pressurized environment inside the motorhome using fans or other equipment. You then apply bubble solution to the suspected problem areas on the roof to see if bubbles form.

Once you find the problem, liquid roof can be used to create a waterproof seal. Liquid roof – or EPDM – can be used for patching, or to apply a new surface to the entire roof. Just be sure to check the instructions to make sure you have a kind of liquid roof which is compatible with your roof material.

3 thoughts on “How to Check Your RV for Leaks

  1. This is the best article on RV roof repair I have found so far. And I have been searching for a while. Anyway, thank you, your instructions or tips were very clear and to the point but also had the info I needed. Very complete. Thanks again.

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