Locate the source of the leak. Inspect all areas where windows, vents, lights, fans, doors and access panels pass through the roof or walls of the travel trailer.
Inspect the seams where the roof and walls meet. Check the areas where walls meet walls. Look for signs of bulging or warping.
Replace all cracked, chipped or broken light lenses. If water appears to be leaking behind a lighting unit, replace the unit and seal with silicone before replacing it.
Use a putty knife to remove all cracked or dried out putty from around fixtures on the roof. Wipe away any debris and replace with gray putty or clear silicone sealant.
Use gray putty to seal all seams. Work the putty into the seams with a putty knife.
Use silicone sealant to seal all windows, door openings and access panels. Seal around the water hookups and check for signs of leaks.
Go inside the RV travel trailer and look for signs of sagging walls and ceilings. Replace delaminated ceilings and walls with luan wood. Use a cordless screwdriver to attach new wood to the frame of the travel trailer.
Examine the floor for soft spots. Remove damaged flooring and any rotting floorboards by cutting them out with a saw. Replace the rotted wood with exterior-grade plywood. Attach new wood to the floor joists with decking screws.