If there are gutters make note of the number of downspouts.
How to measure for roof heat tape.
If the eave overhang is 12 inches deep multiply the roof line measurement determined in step 1 by 4.
Measure the length of the overhang.
Use the included instructions download here to calculate exactly how much roof de icing cable you need to buy.
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These numbers are multiplied by the quantity of downspouts to arrive at the amount of heat tape you ll need to cover your downspouts.
Estimate electric circuit load most roof heating wire products are 110v with rated electric use of 8w per linear foot.
Measure the length of your roof line.
If the eave is between 12 and 24 inches deep multiply the roof line measurement by 5 3.
Install roof heater cables when it s dry outside and it s safe to do the work from a ladder.
Operating costs are far greater than the higher quality self regulating roof heat tape systems we install every day because big box ice dam heat tape systems operate at 100 capacity all the time regardless of the outdoor temperatures.
Then you will multiply this by the length of the roof.
This means that you should not install more than 190 feet of heat wire on a single 15a circuit.
Observe the distance to the nearest outlet.
So a single story downspout is calculated as 15 feet of heat tape a 2 story is calculated as 25 feet of heat tape and a 3 story is calculated as 35 feet of heat tape.
Measure the depth of the eave overhang from the edge of the roof not the gutter straight back to the outside wall.
Basic steps for measuring for heat tape purchase installation.
Measure horizontal roof sections depth of overhang length of each dormer and and length of each downspout.
Measure the linear feet of roof eave a that you want to protect measure the depth of the eave b note any valleys in the roof c that exist where the heat cable will be installed if there are gutters make note of the number of.
There are 19 clips per pack.
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Measure the depth of the eave b note any valleys in the roof c that exist where the heat cable will be installed.
Now you will need to first calculate the overhang multiplier using the measurement you just took.
Basic steps for measuring for heat tape purchase installation.
Divide the roof edge length by 19 and round up to get the number of clips that you will need.