Close-up of a foil under tile with text "FÖRSEGLINGS REMSA 1121 A" visible. The foil has an embossed pattern and is partially covered with dirt.
Hello.

At the risk of being ridiculed, I ask the question. What am I seeing under the tiles?

Is it just a waterproof membrane (moisture barrier) or could it belong to a 48v floor heating loop? It's just thin foil, but the structure in the foil makes me worried.

But it can't possibly be a heating loop in the foil?

The house is from 1970.

Best regards, Thomas Ljunggren
 
If it's a 48 V heating coil, it could probably be it.
 
P
Looks like heating foil, like the kind you glue behind car side mirrors.
 
What is visible is the heating coil itself, which is metal foil embedded between two thin heat-resistant plastic foils.
 
Now I've accidentally made a hole in that foil, I'd guess the cable is done for then?

Does anyone know how these work? Can it be fixed with some special tape or something like that?

Or do you have to lay a new cable after ripping out the floor?
 
Add new real loop, that one is written off now.
 
If it is written off, it is purely an economic accounting technical procedure that has nothing to do with whether it makes sense to repair it or not.

It is possible that it works even with holes.
 
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lopec
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H
T thomaslj said:
Now I've accidentally made a hole in that foil
If a foil loop is off then it's probably done for, if it's just the plastic itself then apply some silicone on the hole
 
That type of underfloor heating is usually divided into sections, so that section is probably damaged, but you can measure. Somewhere in the house, you have a transformer that reduces 230 volts to 48 v. Check it to see how many amps it is designed for. That can give some guidance.
 
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thomaslj
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Check out backer/calesco.com, they manufacture these types of heating foils.
 
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