I'm nearly finished with the roll-off roof observatory I'm building with my local school district, and could use some help.
We really should be having snow right now, but the warm weather has meant all the moisture has been rain. I went out to the site yesterday and found that some of it had ridden the rails into the building and dripped down the walls. Quite a bit, actually. Some may even have done some kind of wicking along the interface between the top of the the wooden plate (made of two treated 2x6s) and the bottom of the 1/4-inch steel plate above it.
One of the rails has its casters riding on inverted angle iron, and the other has them riding on the flat steel plate. More water comes in on the angle iron side. I'm not sure if that's because the hole the water comes in through is larger, or if that's where the prevailing wind comes from.
I built a sort of dam with caulk on the flat steel, hoping that would keep the water out, and it seemed to until this steady, long-lasting rain event we just had.
I'm not sure just how to seal things up better on the roof ends where the rail leaves the building, and would be grateful for any advice others with experience might have. Images would be especially helpful.