How much space should i leave between loops on roof tape?
1st You must know that you can attach the heat tape by spiral wrapping, or by straight run (in- line with the pipe); held temporarily with a few pieces of tape. Of course you will need to apply an insulating wrap (in either case).
The straight run gives the least heat per foot but covers more pipe. The tighter (closer) the spiral wrap of the heat tape loops, the more heat per foot but the shorter the coverage. If the pipe is 1/2" or 3/4" DIAM. then a straight run is sufficient. If 1" to 1 1/4" then a very wide spiral. If 1 1/2 to 2" then a closer loop spiral. In no case should the loops touch each other nor be closer than 3/4" to each other. And avoid having the heat tape cross itself at valves, elbows, etc. PLease note that this is all based on winter temps of 0 degree F. or above and using normal 1" THICK WRAP INSULATION. If you have temps down to -30 or so, then give minimum 2" thick insulation.
Good Luck Macgivor.
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