17126Re: space blankets/condensation
- Mar 16, 2007I live in Canada and have camped in my hammock down to 0F / -20C. I
have a Hennessy Hammock with the SuperShelter.
My sleeping bag is a rectangular side-zipper type rated for 32F. I
wear a synthetic base layer and fleece top and pants.
However, the biggest difference I find for warmth is how I use a
space (reflective) blanket. I have made a top and pants out of the
material that I wear between the base layer and the fleece layer.
The space blanket both reflects back radiant heat loss and acts as a
vapour barrier. The vapour barrier part is important to minimize
body moisture loss (i.e. dehydration) in sub-zero temperatures.
With the space blanket layer I am toasty warm all night, without I
There is condensation buildup under the space blanket, but thanks to
the base layer it is wicked over your body and does not become
The only downside I find is the crinkly noise made but this is
muffled under the fleece layer and inside the sleeping bag.
The important thing about using a space blanket is that it must be
close to your body with a small air gap (i.e. base layer). Otherwise
it is ineffective at reflecting back the radiant heat loss.
--- In firstname.lastname@example.org, "chcoa" <jdeben@...> wrote:
> I'm jumping in a little late on this one but I have used my space
> blanket (bivy sack style) several times for extra warmth with
> good results. I have used it between my clothed body and my CCF
> and under the hammock when testing the HH Supershelter, and I've
> used as it was ment, as a bivy where I was inside the blanket then
> inside my sleeping bag.
> Between me and the CCF results in moisture build up and although it
> did help a little I woke up a damp backside.
> Under me in the HH Supershelter, I didn't notice a difference.
> Me inside the blanket inside my sleeping bag added at least 5 to 8
> degrees of warmth. I was able to use a 45 F bag in 38 F weather.
> My outer layer of clothes were a little damp in the morning though.
> The bivy sack has vents at the feet so that helps a little when
> lying inside the bag.
> Jamie in AZ
> --- In email@example.com, "Jack Rowe" <jackrowe@>
> > The space blankets do need an air space to work, any part you
> weren't actually touching would work but not areas making
> contact...I didn't know how crumbly they are, light enough to carry
> 2+ but no fun making a lot of trash in the woods. If using as a
> vapor barrier it'd be inside insulation, but it would be a crumbly
> vapor barrier and anyway needs the air space to function best.
> > Next time I try it the blanket will be fixed to the underside of
> my over-tarp. IR reflectors are certainly very effective with a
> campfire, even using dull-finished logs and rocks.
> > Jack, NE New Mexico US 7,000 ft
> > [Non-text portions of this message have been removed]
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