I have a 25' stained laminated wood beam in my living room and every year after the weather warms up, the beam collects moisture and it literally rains down to the floor below. It is at the top of a vaulted ceiling, and the highest point in the room. There is no second story above the beam, just a shingled roof. Do I need to prime and re stain the beam? It doesn't seem possible to put in any type of ventilation vents.