Melted snow around roof flashing.

[Mountain Man 511]

Since i am new to all of this i have a stupid question.
We had a metal roof put on over a asphalt roof they put down 1x4 pine to screw the metal to.
I noticed the snow was melted around the roof flashing i would figure that would be normal due to the heat.

The reason i am asking is after the install i could see a little daylight between the support box and the trim my installer said this was normal because of the metal roof. and the flashing setting on top of the metal roof.with another piece of metal roofing over the flashing and then sealed.
If it's just heat from the pipe i will not worry about it but if it is heat from inside the house then i have a problem.

 

[Oldman47]

I think I can picture the way your roof is arranged and if I am right the light you see is no big deal. I installed flashing around lots of openings in my new roof for things like plumbing and radon vents. On a couple of those I noticed that at certain times of day I could see a bit of light from inside the house shell, what would one day be my attic. Before the ceiling was closed in to form my attic I saw extreme rain storms with zero leakage so I quit worrying about it. The downhill side of any flashing is intentionally not sealed so that any moisture that gets inside will run out on the remaining surface that the flashing covers. Think about it this way. A flashing runs up under the higher part of the roofing to create an overlap that will shed water and it covers the roofing below that flashing to again create an overlap that sheds all water. In order for flashing to work right the downhill side must always be left open and that means it can leak light. Light really does not respect uphill/downhill limitations.