Foil up or foil down?

[Streetrod]

Guy’s quick insulation question. I am doing some top up insulation in my loft with some B&Q stuff that is wrapped on one side with foil and plastic on the other. Is the foil surpossed to point down towards the ceiling or up into the loft. The instructions don’t indicate?

Thanks in advance

[badboyburt]

Foil down, it reflects the heat.

[Spudler]

UP.

[Engineer1]

Have you considered reading any info on the packaging it may tell you on there, my vote is foil to the sides well we've had up and down .

[Silver993tt]

aren't you supposed to peel the foil off?

[stimps]

Surely it doesn't matter, one way you're reflecting the heat back in, the other way you're reflecting the heat back out.

[badboyburt]

Thats why I would have thought Foil down, plastic side up.

[stimps]

Heat doesn't mean hot, reflecting heat away can mean reflecting cold away.

I would put it facing inwards though.

[Ledaig]

A quick google seems to say UP as it also acts as a vapour barrier.


Is it rolled? If so then there will only be one sensible way to lay it straight from the pack

[badboyburt]

Ledaig said:

A quick google seems to say UP as it also acts as a vapour barrier.


Is it rolled? If so then there will only be one sensible way to lay it straight from the pack

Is your wallpaper back to front ? Is your carpet face down ?

Surely the OP wants to keep the heat in his property ? and not just warm his loft up ?

[Streetrod]

Ledaig said:

A quick google seems to say UP as it also acts as a vapour barrier.


Is it rolled? If so then there will only be one sensible way to lay it straight from the pack

Good point that man

[Hugo a Gogo]

stimps said:

Heat doesn't mean hot, reflecting heat away can mean reflecting cold away.

I would put it facing inwards though.

what is the source of this cold radiation?

[Spudler]

There seems to be a bit of guess work going on here, Streetrod...just make sure you lay it with the foil up ...mkay

[Simpo Two]

There's no such thing as cold, it's simply the absence of heat. It can't radiate...

[Ledaig]

badboyburt said:

Ledaig said:

A quick google seems to say UP as it also acts as a vapour barrier.


Is it rolled? If so then there will only be one sensible way to lay it straight from the pack

Is your wallpaper back to front ? Is your carpet face down ?

Surely the OP wants to keep the heat in his property ? and not just warm his loft up ?

No, however should I be confused in which way to lay a carpet or hang wallpaper, I'm sure a quick google would point me in the right direction. Just like in this instance where a couple of manufacturers web site state the foil is a vapour barrier and the plastic is not - hence foil side up.

If you disagree enough, go find some evidence to support your stance and post it up!!

[badboyburt]

Ledaig said:

badboyburt said:

Ledaig said:

A quick google seems to say UP as it also acts as a vapour barrier.


Is it rolled? If so then there will only be one sensible way to lay it straight from the pack

Is your wallpaper back to front ? Is your carpet face down ?

Surely the OP wants to keep the heat in his property ? and not just warm his loft up ?

No, however should I be confused in which way to lay a carpet or hang wallpaper, I'm sure a quick google would point me in the right direction. Just like in this instance where a couple of manufacturers web site state the foil is a vapour barrier and the plastic is not - hence foil side up.

If you disagree enough, go find some evidence to support your stance and post it up!!

No need the evidence is in the ops Question, one side is foil one side is plastic.

Love the way everyone has to disagree, I will just keep laying the right way up as I have been for over 15 years maybe Celotex know nothing about insulation and they have it wrong.

Stop being so defensive lmao

[Spudler]

The OP is "topping up" his insulation, you dont lay foil down on top of existing insulation.
Take it from someone whose been in the industry for 28 years

[T84]

Plastic doesn't completely nullify the reflective qualities of foil, surely?

[Globulator]

Hugo a Gogo said:

stimps said:

Heat doesn't mean hot, reflecting heat away can mean reflecting cold away.

I would put it facing inwards though.

what is the source of this cold radiation?

Yes, I was puzzled by that
Stimps: stay off the whiskey!

[Silver Smudger]

T84 said:

Plastic doesn't completely nullify the reflective qualities of foil, surely?

Is the foil shiny on both sides? Cooking foil is not and many people use it shiny side out - which is incorrect.

Shiniest side towards the thing you want to keep warm, in both cases