R value of mattresses in huts - query
Does anyone know what the R value of a hut mattress might typically be? I’m asking because I’m thinking of buying a quilt for tramping (-8 limit rating). I currently have a Sea to Summit ‘comfort plus‘ mat that is rated R 5 so I know the quilt will be warm enough paired with this mat when camping - even if it’s a bit cool. However, it would be helpful to know the typical R rating for a hut mattress to see if I could get away with a lower rated bag when in a hut. Thanks for any feedback on this.
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In term of R value, I would put them as high as anything. I routinely slept out this winter at Blyth Hut when it got down to -5 or so and I was toasty warm in a lightweight bag, huts provide alot of warmth just in eliminating wind and air movement alone, but in summer they can be hot. Keep in mind ALL sleeping pads have 100% vapour proof fabric, so it theory they are no hotter than anything else, moisture can't pass through a Thermarest either, it's just the type of fabric they are covered with. The problem with a quilt is that you won't necessarily have anything between you and the mat except clothing, so wearing long pants and sleeve will help you sleep better in my experience.
My impression of DOC mattresses (or anything that gets its R through a large bulk of material like they do) is that at the start they are a large drain on your body as the top layers heat up drawing warmth from you, but as the night goes on and the steady temp gradient establishes itself across the 100mm, 10kg of mattress I have the opposite issue: they become too bloody hot - a reservoir of heat - and I start sweating. So yes they do have a high R but initially are a high drain on thermal energy due to their high thermal mass (bulk/volume) compared to a much slimmer sleeping mat of similar overall R.
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