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#126264 - 01/04/10 06:00 PM Re: aluminium heat reflection [Re: chris angus]
lori Offline
member

Registered: 01/22/08
Posts: 2801
Your foil blanket will be more effective if you put it on top of the pad, where it will reflect heat back up to you. Heat doesn't get to it through the foam.
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#126265 - 01/04/10 06:37 PM Re: aluminium heat reflection [Re: lori]
sarbar Offline
member

Registered: 07/15/05
Posts: 1453
Loc: WA
On where to place the mylar: if under the pad you don't get condensation. On top of the pad and you run the risk of wet down by morning.
What happens with many inflatable pads is the cold of the ground sucks your heat right out of your back - a reason why snow campers sleep on 2 pads, one being a Ridgerest or blue pad that is solid and then an inflated pad for comfort.

And to the above poster that commented on cold not coming up from the ground...er, go sit on frozen ground. Yes, the cold is coming up! The mylar works by stopping your heat loss (by reflecting) but also you don't feel the cold beneath you as it is a barrier between your butt and the frozen ground.

Neo Airs have a metalized layer on bottom which serves both purposes....
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#126268 - 01/04/10 08:13 PM Re: aluminium heat reflection [Re: sarbar]
Eugene Offline
member

Registered: 12/26/09
Posts: 60
Loc: San Diego, CA
I hate to belabor the point, but it's basic chemistry/physics. Hot goes to cold. Hot is due to energy. Cold is due to a lack of energy. You get cold from sitting on the ground because the heat differential causes heat to want to leave your body. If you don't stop it, you will get cold.

As far as the double pad thing, I've heard some people say you'd be warmer to put the foam pad on top of the air pad.
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#126281 - 01/04/10 10:44 PM Re: aluminium heat reflection [Re: Eugene]
Tango61 Offline
member

Registered: 12/27/05
Posts: 931
Loc: East Texas Piney Woods

But Sarbar is right. That cold DOES come up out of the ground and sucks the heat right out of my rear-end and right back down into the ground.
Can't you just see that little cold gremlin now? grin
Picture it in your mind. That's really how it happens!
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#126300 - 01/05/10 09:47 AM Re: aluminium heat reflection [Re: Eugene]
finallyME Offline
member

Registered: 09/24/07
Posts: 2710
Loc: Utah
Sarbar, eugene is right about the cold and hot. Cold really doesn't exist. It is just an idea to help us understand heat. It isn't a "thing", but a lack of a "thing". Dark is a similar concept. Dark doesn't exist, but is a way to describe a lack of light. When you think you feel cold creeping up on you, you are actually feeling the heat leaving the area. But, this doesn't have much to do with the discussion.
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#126485 - 01/08/10 12:14 AM Re: aluminium heat reflection [Re: oldranger]
DJ2 Offline
member

Registered: 01/06/02
Posts: 1347
Loc: Seattle, WA
I have a few pads like that. I got them at K-Mart.

The foil side is a little slick and eventually delaminates. In the mean time I like them because the foil side can easily be wiped dry if they get wet.

I don't notice any difference in insulating value, however.

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