Tuff Cable installed in Invizimelt Panels is compatible with all roofing materials — including metal roofing, non-metal shingles (asphalt, composite, wood shake, tile), membranes, valley metal, flashing, and metal drip edges. This makes Tuff Cable the more versatile of Heatizon’s two under-roof heating elements: where ZMesh is limited to non-conductive materials, Tuff Cable embedded in a heatsink works under any roof covering.
Invizimelt is Heatizon’s patented aluminum panel system designed for under-roof deicing. Tuff Cable snaps into the Invizimelt Panel channels, which then act as a heatsink — distributing heat evenly across the panel surface and up through the roofing material above. The aluminum construction provides rapid, efficient heat transfer compared to cementitious heatsink materials. Invizimelt Panels are modular, available in different sizes to fit varying roof pitches and valleys, and can be installed on new construction or retrofitted over the roof edge on existing roofs.
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.
Yes. Tuff Cable is the only low-voltage heating cable designed to withstand hot-pour asphalt installation. Its 10-gauge coated copper construction and chemical resistance allow it to survive the temperatures and chemical composition of freshly poured asphalt — making it the only practical low-voltage option for new asphalt driveway and roadway snow melting applications. In a two-pour asphalt installation, Tuff Cable is laid on the binder or base coat layer, and the final asphalt surface layer is poured directly over it.
Yes. Tuff Cable is listed by Intertek (ETL) — an OSHA-recognized Nationally Recognized Testing Laboratory — to UL and CSA standards for snow and ice melting on surfaces and roofs, and for interior floor heating applications. Together with ZMesh, Tuff Cable is one of only two products in the world authorized under UL Standard 1588 for snow and ice melting installed under roofing materials. All Heatizon systems are designed to ASHRAE standards for heating load calculation and energy efficiency.
Tuff Cable and ZMesh are both Heatizon low-voltage heating elements and both are ETL listed under UL Standard 1588 for under-roof snow melting — but they are designed for different installation methods. Tuff Cable is a round copper cable that must always be embedded in a heatsink material (concrete, asphalt, mortar, Invizimelt panel). ZMesh is a flat bronze mesh that lays directly beneath flooring or roofing without any embed. Tuff Cable is the right choice where a heatsink is present or required — driveways, metal roofs, floor overlays. ZMesh is the right choice where no embed is possible or desired — under non-metal shingles, hardwood floors, and carpet.
Tuff Cable carries an industry-leading 25-year manufacturer’s warranty — the longest available for any electric radiant heating cable in its category. The warranty reflects the cable’s construction: 10-gauge coated copper heating cable that gets embedded in a protective heatsink, with footage marks for verifiable installation, and a low-voltage design that reduces electrical stress on the insulation over time. Heatizon has documented installations from decades ago that remain fully operational.
Tuff Cable is a low-voltage system powered by a step-down transformer that reduces the supply voltage — typically 120V, 208V, 240V, or 277V AC — to 65 volts or less at the cable. This low operating voltage is one of Tuff Cable’s key safety advantages over line-voltage systems, and it also allows the cable to be cut and spliced in the field, and to be installed in surfaces where line-voltage systems are not permitted or practical.
ZMesh is a cut-to-length product, unlike most UL-listed radiant heating cables which are fixed-length. This gives installers flexibility to size each run precisely to the space — eliminating the waste and design constraints of fixed-length systems. ZMesh is available in rolls from 50 to 400 feet and can be cut on site to the exact length required by the project layout.
Yes. ZMesh is one of the only radiant heating elements on the market that can be repaired in the field if cut or damaged. Repair requires a customized copper splice plate and solder — a straightforward process compared to the full element replacement required by most competing fixed-length heating cables. This repairability is a meaningful long-term advantage, particularly for installations that may be subject to renovation or remodeling work years after the original installation.