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Automatic electric heat cable under fiberglass insulation

Automatic electric heat cable under fiberglass insulation


  #1  
Old 10-09-15, 01:47 PM
B
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Automatic electric heat cable under fiberglass insulation

My son has a tub drain that is wrapped in 6 in fiberglass insul.It froze twice last year. I was thinking of using --Automatic Electric Heat Cable Kit--- to wrap the plastic drain in. I do not think it is a problem .Any one think other wise.
 
  #2  
Old 10-09-15, 01:55 PM
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They make heater wrap tapes specifically for PVC pipes.
Comes in several useful lengths.

Frost King 30 ft. Automatic Electric Heat Cable Kit-HC30A - The Home Depot
 
  #3  
Old 10-09-15, 06:08 PM
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I've seen a lot of heat-tape installations and all were insulated over the heat-tape. None of them used any "special" insulation. Soft fiberglass wrap, rigid fiberglass pipe insulation, Foamglas (do a Google) and rubber.
 
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Old 10-09-15, 07:19 PM
J
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Better yet figure out why out why it keeps freezing.
Mobile home?
Sitting next to an open foundation vent?
Not enough slope.
Drains should be the last thing that freezes, 99% of the time there's no water in them.
 
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Old 10-09-15, 07:25 PM
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Drains should be the last thing that freezes, 99% of the time there's no water in them.
Traps have water in them 100% of the time...or should.

I've seen the P-traps on washbasins inside heated buildings insulated with foam rubber tubing...in the Puget Sound region where freezing temperatures are not that common.
 
  #6  
Old 10-09-15, 07:49 PM
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Bob, is this in an unheated area? A typical rule of thumb is to insulate between the pipe and the cold but NOT insulate between the pipe and its heat source. Not sure if this applies in this situation.

Bud
 
 

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