™ ™ SnoTrace RGS Systems for Roof and Gutter Snow and Ice Melting DESIGN GUIDE
™ ™ SnoTrace RGS Systems for Roof and Gutter Snow and Ice Melting DESIGN GUIDE Contents Introduction ........................................................................................4 Application Information ................................................................4 Product Description Characteristics Approvals Basis for a Good Design................................................................. 5 RGS Multipliers ..........................................................................
SnoTrace™ RGS™ Systems for Roof and Gutter Snow and Ice Melting Abrasion Resistant Polyolefin Outer Jacket (with UV inhibitor) Introduction This design guide provides a basis for designing a roof and gutter snow and ice melting system.
DESIGN GUIDE Basis for a Good Design The area that will require heat tracing is based somewhat on the size and shape of the building. A building with no overhangs, for example, may only need gutter and downspout protection while an overhang covering a building entrance that is subject to drifting may need complete coverage.
SnoTrace™ RGS™ Systems for Roof and Gutter Snow and Ice Melting RGS Multipliers Select a multiplier from the examples shown based on the type of roofing material utilized. If gutters and downspouts will also require protection, be sure to add the cable requirements (see Table 3.3) to the roof overhang footages. How far up the roof the heating cable should travel may be determined by measuring the distance as shown at right.
DESIGN GUIDE Shingle Roofs All shingle roofs (fiberglass, cedar shake, flat tile or concrete shingle) can utilize heating cable installed in a serpentine pattern as detailed in the partial sketch below. The heating cable may be attached to the roof and fascia with cable fasteners (Catalog No. multipliers have been shaded for each overhang distance. Should conditions dictate a specific pitch, multipliers for additional spacings have been included.
SnoTrace™ RGS™ Systems for Roof and Gutter Snow and Ice Melting Installation Accessories 1. RGS-CFK circuit fabrication kit is designed to terminate one circuit for both power connection and end termination (junction box by others). 2 2. CL-1 “Electric Heat Tracing” labels peel and stick to junction boxes, breaker panels and control panel(s), or as required by code or specification. 1 3. RG-CMC cable mounting clips secure RGS heating cable to the roof utilizing screws and a waterproof cover material.
DESIGN GUIDE 7 2 1 5 3 4 8 6 Example To determine the recommended amount of cable for a standing seam metal roof under a heavy snowfall rate with 350 mm seams/ridges and a 450 mm overhang use Table 3.1 on page 6. Using the column for 350 mm seams/ridges and the row for an 450 mm overhang indicates the application would require 4.2 m of cable per linear meter of roof. Therefore if the length of the roof was 30 x 4.
SnoTrace™ RGS™ Systems for Roof and Gutter Snow and Ice Melting General Specification Part 4 System Performance 1. Amount of cable required to maintain a clear path for melted snow and ice to drain shall be based on size and shape of protected area and expected weather conditions. 2. Design and layout must comply with Section 6.2, Roof and Gutter De-Icing, of the IEEE Standard 515.
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