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Old 06-13-2015, 06:55 AM   #1
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Insulated underbelly venting

Hi gang.

My 33 rlds has been parked seasonally for 3 seasons now and I have sealed up every little gap with spray foam to ensure I don't have any issues with critters and so far so good thankfully. We have had a lot of rain this spring and I'm wondering if I should install a couple of small vents with screens that will keep the critters out but allow for some air movement. My concern is now that it may be too air tight and I don't want moisture, condensation to form. Thought?

Thx in advance. Kelly
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Old 06-13-2015, 07:56 AM   #2
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We had a TT on site for 10 years, and had no issues even though it was next to a lake. When we packed up, we put an AIR-Z-DRI (from CW) in the kitchen sink to absorb anything in the inside air. There are many kinds of air absorbants available, and that should do it unless you're in 90% humidity all the time.
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Old 06-13-2015, 08:23 AM   #3
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Do you have a removable panel to get to slide motor? That would be the place to install a screen that can be removed as needed, w/o cutting more holes.
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Old 06-13-2015, 10:20 AM   #4
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If it is a fifth wheel the storage compartment heats and vents the underbelly. Not sure on travel trailers.
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Old 06-13-2015, 05:37 PM   #5
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Put on some vent covers and then you can leave the vents open all the time.
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Old 06-14-2015, 10:41 AM   #6
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My area of concern in terms of moisture or high humidity would be in between the underbelly sheeting and the main floor. I'm not concerned inside the trailer as that's not an issue and I have every opening in the main floor sealed with spray foam. I just don't want the underbelly to sweat and that's the reason of installing a couple of vents with screen. Thx so far for all your replies
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Old 01-21-2023, 10:10 AM   #7
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I know this is a old post that I just found. I think putting a couple of small vents in the underbelly is a good idea. It would help to keep insulation dry from the condensation from a tightly sealed underbelly.
I also believe when the underbelly is being heated in cold weather the air movement from the furnace in the underbelly would be allowed to circulate better as it's not going into a tightly sealed underbelly.
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