Is Tuff Cable listed for installation under metal roofing?

Yes. Tuff Cable, installed in Heatizon’s Invizimelt Panel, is the only listed system for snow and ice melting under metal roofing, valley metal, flashing, and metal drip edges. This under-metal-roof listing is covered under UL Standard 1588 and ETL certified — the same standard that makes Heatizon’s products the only under-roof systems compliant with NEC Article 426. Tuff Cable must always be fully embedded in the Invizimelt Panel for metal roof applications — it cannot be laid directly against metal roofing surfaces without a heatsink material.