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Old 11-09-2014, 11:46 PM   #15
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We went all in. We have a layer of Reflectix carpet-taped to the plywood under the bed. Then we threw down an old flannel sheet. Next, we put a layer of Hypervent. Then, the mattress. (The flannel sheet protects the Reflectix from the Hypervent, which can be a bit pokey.) If that's not enough, we'll add a second layer of Reflectix to the first. As a side benefit, the bed is also more comfortable.
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Old 11-10-2014, 08:45 AM   #16
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Originally Posted by Ted S. View Post
There are several products on the market that promote air circulation:

Dry-Mat_Anti_Condensation_Layer
Dry-mat laid directly on the plywood, with a Mylar space blanket on top of it— under the mattress— to reflect your body heat back up through the mattress. Side benefit, you'll sleep warmer, too.
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Old 02-21-2016, 04:26 AM   #17
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So is this a matter of the outside air and inside air, leaking seals, or the human body heat transfer? Looking at the HYPERVENT product one would say it's just body heat transfer causing the issue.
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Old 02-21-2016, 11:13 AM   #18
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Looking at the HYPERVENT product one would say it's just body heat transfer causing the issue.
Not really. Condensation happens when warm moist air at a temperature above the dew point comes into contact with a surface whose temperature is below the dew point, and stays in contact long enough for the moisture to condense out of the air.

So control of condensation can take many forms:
* Keeping surfaces warmer than the dew point, which is difficult when the surface has cold air on one side and warm air on the other;
* Keeping air circulating so that moisture doesn't have time to condense out of the air onto the cold surface;
* Keeping the air drier by raising the air temperature;
* Keeping the air drier by lowering the moisture content.

But it is true that Hypervent material is designed to only address one cause of condensation, namely the lack of circulation. Whether that will be enough to do the job for you is something only you can tell, and only by trial and error.
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Old 02-21-2016, 12:06 PM   #19
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So is this a matter of the outside air and inside air, leaking seals, or the human body heat transfer? Looking at the HYPERVENT product one would say it's just body heat transfer causing the issue.
Another way to understand what is happening:
When you listen to a weather report they sometimes give a temperature called the "dew point", the temperature at which moisture will condensate out of the air. That temperature will usually fall between the outside unconditioned temperature and the inside conditioned (heated or cooled) temperature. When that "dew point" temperature occurs within a confined space, where the relative humidity is high enough, the "dew" makes the interior of that space wet. That is what is happening within the mattress. A sweating body can contribute additional moisture and heat.

Insulating beneath the mattress may move the location of the dew point to a point outside of the mattress.
Or providing air circulation beneath the mattress may allow the dew to evaporate as it forms, and also may move the dew point outside of the mattress.
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