Is the 8 ft. Corrugated Galvanized Steel Utility-Gauge Roof Panel able to support melting snow run off from under a traditional wood or poly deck?

Yes, they should be strong enough to support melting snow runoff

Yes, they should be strong enough to support melting snow runoff from under a traditional wood or poly deck. Make sure to pitch the panels slightly to allow runoff away from the home. If the panels are directly exposed to the elements as “shade or shelter” and would be supporting the snow load, then you should check with your local building code for requirements.