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C. FOR ROOFS WITH SPECIAL ROOF AREA APPLICATIONS
STEP 1. For each area listed in Table B-5, measure the required dimensions (see Figure B-1 on page 20 and Figure B-3) and calculate the length of
cable needed. Add each "area" calculation to determine the total cable length needed.
Table B-5 Cable Length Estimation Formula for a Roof with Special Roof Areas
Area What to measure
Along Roof Overhang (A)
Length along roof (B)*
Dormer Distance around dormer (C)
Valley Number of valleys (D)
Downspouts Number of downspouts
Length of downspouts from roof to ground (E)
Special roof areas Distance from roof edge to bottom of special roof area (F)
(such as skylights)
Width of ice dams that form along special roof area (G)
*Note: Do not include the width of special areas (G) in this measurement.
STEP 2. Use the estimated cable length calculated above to select the proper de-icing cable from Table B-3 on page 21. In general, choose
the longer cable if the length you need is between the sizes offered. If the difference is small (less than 5 feet or so), the shorter
cable can be used. You cannot change the cable length by cutting, splicing or altering it in any way.
If ice dams are occurring on roof areas that area significant distance apart, you may want to use a separate cable for each location, rather than
choosing one large cable. Also, if roof areas are large, separate cables for the roof area and gutter should be used.
G
F
F
G
B
Figure B-3. Roof Measurements
22
D
How to calculate
Length of roof (B) X Overhang Multiplier (see Table B-2)
Number of dormers X Distance around dormer(s) (C)
Number of valleys (D) X 6 feet or 1.8 meters
Number of downspouts X Length of downspout (E) X 2
Distance from roof edge to bottom of special roof area (F) X
Width of ice dams that form along special roof area (G) X
Special Roof Area Multiplier (see Table B-6)
C
Table B-6 Special Roof Area Multiplier
Multiplier
for roof with
gutter
2.6
E
Multiplier
for roof without
gutter
1.6
ADKS Owner's Manual