Front wall wet after highway rain

2019 fifth wheel, fiberglass front cap with three ID lights and two clearance lights. 30A shore, parked inside the shop

Customer says: When we drive in the rain, the front bedroom wall gets wet up by the ceiling. Parked in the rain, it stays dry.

Water stain at the top center of the front bedroom wall, above the headboard.

Tests you can run

• Moisture meter map of the front bedroom wall
• Ask exactly when it gets wet
• Look at the cap-to-roof and cap-to-sidewall seams
• Hose the front of the roof and the cap from above like parked rain, 20 minutes, meter on the wall
• Pressure test: windows, door and vents shut, blower in one roof vent, manometer at a few tenths of an inch WC, soapy water on the cap
• Hose nozzle on hard spray, aimed at the cap from the front, one spot at a time
• Pull the ID light above the wet spot and look behind it
• Reseal every seam on the front cap

Repair options