Anyone any idea what this is behind plasterboard. Testing positive for AC current. Confused.

[watsonb01]

 

[littlespark]

Some form of lining for damp?

I can across same in an old house… walls were 3ft thick, no cavity. Same but a white/clear plastic.

Maybe not a good idea to puncture it.

Old house or below ground level room?

 

[watsonb01]

Some form of lining for damp?

I can across same in an old house… walls were 3ft thick, no cavity. Same but a white/clear plastic.

Maybe not a good idea to puncture it.

Old house or below ground level room?

Hi. Thanks, have came to same conclusion. Old house, top floor flat, very thick gable wall. Just dont get why it is testing AC current with 3 testers.

 

[littlespark]

What sort of testers?

I got a non contact to light up on a brick wall once… due to a screw and raw plug going through a buried twin and earth…. Shorting neutral to earth.

Was showing live on both sides of the wall.

 

[DPG]

Any foil backing?

. . . .

 

[watsonb01]

What sort of testers?

I got a non contact to light up on a brick wall once… due to a screw and raw plug going through a buried twin and earth…. Shorting neutral to earth.

Was showing live on both sides of the wall.

Hi, 2 non contact pens and also a metal and ac current handheld scanner of some sort i found in my garage. All 3 seem to work as i can trace cables running down walls to sockets and switches but on this one wall that appears to be lined with this stuff the whole wall causes a positive test for AC. Bit strange.

 

[DPG]

Hi, 2 non contact pens and also a metal and ac current handheld scanner of some sort i found in my garage. All 3 seem to work as i can trace cables running down walls to sockets and switches but on this one wall that appears to be lined with this stuff the whole wall causes a positive test for AC. Bit strange.

I reckon foil backing could be causing this.