Metal Roof PVC standpipe is loose

[Cy]

Terry,
The vent pipe was leaning over after the snow on the roof began melting and sliding off the roof. Standpipe vents from the large sewer line behind washer/dryer in basement near the outsde wall. Upon inspection on the roof, the pvc pipe can be swirled around like a joystick. Tried to reinsert it blindly into the standpipe without any luck. It's a sloped metal roof and without any fall protection harness, I didn't feel the risk was worth it to go beyond inspection. Apparently, the standpipe did not have pvc cement at a joint.
Question: Do I hire only a plumber or can a metal roofer correct the problem.
Cy

 

[hj]

Whichever is willing to risk life and limb to go up on the roof. I would defer to a roofer.

 

[Sponsor]

 

[Cacher_Chick]

If there is an attic, it would probably be the best place to repair and reinforce the installation.

 

[Cy]

cacher_chick,
No attic. two story log-sided home on the side of a mountain with a slope of 30-45 degrees. The standpipe apparently goes up through the outside wall and then across through the joists then up through sheathing under the metal roofing. Guess i'd better go with the first recommendation for a roofer with the necessary skill set.
Cy