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Old 10-26-2018, 01:42 PM   #1
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Hypervent and sweating?

Do you need hypervent, for moisture under the mattress? Is warmth and moisture an issue even with the extra insulation? How about the rest of the trailer?
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Old 10-26-2018, 02:18 PM   #2
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Do you need hypervent, for moisture under the mattress? Is warmth and moisture an issue even with the extra insulation? How about the rest of the trailer?

I haven't had a problem. Don't have extra installation. Open a vent if you are occupying the trailer ( or stop breathing ).
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Old 10-26-2018, 02:50 PM   #3
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You do not need the hypervent, it is just somewhat can prevent an issue that could arise. Using your camper in moderate temps will not cause any issues, it is the extreme use that can. Need vs want are a constant battle.
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Old 10-26-2018, 03:19 PM   #4
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Do you need hypervent, for moisture under the mattress? Is warmth and moisture an issue even with the extra insulation? How about the rest of the trailer?
You live and will probably camp in more moisture than us, freeride, however we have been up and down the Washington and Oregon coasts several times. We do not use hypervent. When in camp, we always have the stove vent and the bathroom vent open. Just enough air flow to prevent condensation. When it is cold, we run the furnace. Just like Glenn, never a moisture issue.
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Old 10-26-2018, 07:00 PM   #5
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We have hypervent cut for the 17b and never bother to use it if anyone wants a good deal on the stuff.
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Old 10-26-2018, 07:10 PM   #6
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Well, I can only relate my own experience. I put the material under my mattress in my 19 along with a layer of reflectix and have had no condensation problems. Over the past couple of weeks, however, night time temps have dropped into the 20s. So, I checked again this morning and the underside of the mattress is fine... dry. Around the sides of the mattress, however, I found moisture on the walls :-( So, moisture is condensing on the cold walls (I have the extra insulation but it still isn't much). The mattress in the 19 is a pretty tight fit to the walls so little or no air circulates between the mattress and the walls. So, I'm going to add hypervent (Actually Aire Flow which is the same stuff) between the mattress sides and the walls. It will be a tight fit but should hopefully work OK. By the way, relative humidity in the trailer is only around 40% so it's not real humid. But, those walls are cold so below the dew point. So, if you plan to camp in cold outside temps, using the hypervent may be a good idea. I will be full timing so trailer will be in continuous use. If just used for weekends or vacations, maybe not an issue as you can dry out any moisture when you get home.
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Old 01-02-2019, 03:01 PM   #7
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Ok I've read about all of the hyper vent, etc. We have a thing rug material under the bed and insulation in the walls. We went camping in the cold for first time and the walls were sweating, big time around the mattress and the seat cushions. The outside was about upper 40's to 50's. We had a window cracked or the vent open. We ran the heater on about 68. Why are we having such a problem? Can't lower the heater , we have old dogs on the floor. Any ideas? Makes me wonder if the insulation really got put in the walls...….yikes.
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Old 01-02-2019, 03:07 PM   #8
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Ok I've read about all of the hyper vent, etc. We have a thing rug material under the bed and insulation in the walls. We went camping in the cold for first time and the walls were sweating, big time around the mattress and the seat cushions. The outside was about upper 40's to 50's. We had a window cracked or the vent open. We ran the heater on about 68. Why are we having such a problem? Can't lower the heater , we have old dogs on the floor. Any ideas? Makes me wonder if the insulation really got put in the walls...….yikes.
Did you get the foam spray underneath the trailer option, that will help with the floors being warmer. With the 21 there are really only 2 walls subject to sweating. Pull the mattress away and let air circulate along the side wall. With the Maxxfan on low and exhaust it should be fine.
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Old 01-02-2019, 03:21 PM   #9
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Originally Posted by Ginger View Post
Ok I've read about all of the hyper vent, etc. We have a thing rug material under the bed and insulation in the walls. We went camping in the cold for first time and the walls were sweating, big time around the mattress and the seat cushions. The outside was about upper 40's to 50's. We had a window cracked or the vent open. We ran the heater on about 68. Why are we having such a problem? Can't lower the heater , we have old dogs on the floor. Any ideas? Makes me wonder if the insulation really got put in the walls...….yikes.
We get condensation in those areas, but it usually has to be much colder outside. Was the relative humidity high inside the trailer from cooking, showering, etc.? To get sweating your wall surface temperature is below the dew point of the inside air.
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Old 01-02-2019, 03:47 PM   #10
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There are 2 things that I do every trip. Open bathroom window 1/2” or so and run max fan on low setting. The only time the fan is off is if the door is open. 5 years, over 200 nights and no problems with sweating. I’ll admit that most of my camping has been east coast with lower overall humidity than the great north wet. (Or west)
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