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Roof Deicing
Selection of heating cable. The total heating cable length for
deicing is determined by including all elements of the roof system
that need protection. Use Tables 1 and 2 to determine the total
length of cable. Usually one cable will be sufcient for both roof
and gutter areas. For larger installations, use separate cables for
roof area and gutter/downspout area.
Installation procedures
• Remove leaves, pine needles, or any combustible debris
from roof, gutters and downspouts before installing roof
deicing cable.
• Use ZH-C Roof Clips (sold separately) for attaching the heating
cable to the roof (shingle and metal roofs).
• For downspouts longer than 20 feet (6.10 m), use DSH
Downspout Hanger (sold separately) to support the heating
cable where it enters/exits a downspout.
One hanger is required for each downspout. Always loop the cable
down to the bottom of downspout and back up toward gutter,
clamping it into downspout hanger to prevent cable from being
damaged by drain/gutter edge. This also ensures that the cable tail is
secured on the roof. Cable to be linked to roof loop (see diagrams).
Weatherproof Outlet
Box (by installer)
“E” overhang distance from
roof edge to face of wall
Heater Cable
Drip Loop
24"
TYPICAL SHINGLE ROOF (Single cable shown for roof and gutter)
“H” loop height
overhang
TYPICAL METAL ROOF (Separate cables shown for roof and gutter)
DSH
Hanger Clamp
MID CIRCUIT
DOWNSPOUT
INSTALLATION
End Seal
Must not be submerged
nor allowed to be at the
bottom end of a down-
spout.
END CIRCUIT
DOWNSPOUT
INSTALLATION
Roof Clip (ZH-C)
Heater Cable
Roof Clips
(@24" (60.96 cm)O.C.)
H
Drip Loop (Typ.)
Weatherproof
outlet box
(by installer)
Clip gutter cable to roof
cable to provide a path for
water to get to ground
Table 1 Determination of total cable requirements
Model # # of Cables
Roof Edge From Table 2 based on eave overhang
Gutter 1' (30.48 cm) of cable/foot of gutter (if gutter is
wider than 6"(15.24cm), use 2 traces)
Downspout 2' (60.96 cm) of cable/foot of downspout–cable
is looped down and back
Roof Valley 6' (1.83m) of cable/valley - loop 3' (0.91m) up
valley and back
Dormer
Perimeter
1' (30.48 cm) of cable/foot of dormer perimeter
Table 2 Cable length factors vs. eave overhang
Eave
Overhang E
Loop
Height H
Length Factor
Shingle Roof *
Length Factor
Metal Roof **
12"(30.48 cm) 18"(45.72 cm) 1.9 2.5
24"(60.96 cm) 30"(76.20 cm) 2.7 3.5
36"(0.91 m) 42"(1.07 m) 3.6 4.5
48"(1.22 m) 54"(1.37 m) 4.6 5.5
Cable length required = Length Factor × Roof Length (feet/m)
Notes:
* Typical shingle roof with sawtooth pattern. (See diagram)
** Typical metal roof with loop pattern spaced 24" (61 cm)
- for other spacing these factors will need to be adjusted
accordingly. (See diagram)
For other designs, contact EasyHeat.
TYPICAL MEMBRANE ROOF
Valley
Heater Cable
Power Connection
Roof Clips
Downward Slope
Drain
Downward Slope