condensation around chimney

I have a standing seam roof and the rafter next to where the chimney goes through the roof is getting moisture enough so that icicles are hanging off it. There is snow on the roof but very little around the chimeny area and it is well below freezing. Is it possible that the portion of the metal that goes up the brick and meets with the lead is getting condensation on the inside and running down into the house? If that is possible, this summer, would using some spray foam from underneath around that area help? It seems like the brick is getting warm enough to cause the metal to condensate. It's too cold for anything to melt. Thanks for any help.