When it is very windy and rainy (heavy rain alone does not seem to cause this), I notice a small leak on our ceiling (a drop every ~2-5 minutes). I'm not sure if there's actually a water intrusion or if it's just due to condensation. We have a SIP panel roof, and the leak appears to be right at the joint/spline. I've attached two pictures. One is the inside ceiling where there appears to be a leak -- it happens at the intersection of the wood beam and the spline. The other is the roof outside. It appears pretty well glued down, I couldn't easily pull up any of the panels. There is a nearby vent pipe, although it is around 6ft from the location of the leak. Note that because it is a SIP panel roof, the ceiling "is" the roof. What should I check to investigate the cause of the leak?