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Old 07-10-2016, 07:09 AM   #1
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Belly pan weep holes--a good idea?

I searched for a discussion about belly pans and weep holes, and couldn't find a dedicated thread on the topic.

I recently dropped my freshwater tank pan and found all kinds of funk in there. The styrofoam is saturated, probably from overfilling the tank and a loose vent tube connection I found at the fill door. Once I put a fitting on the fill door vent hole connection so it's sealed tight, there shouldn't be much water getting in there anymore. That said, I'm considering putting some 1/8" weep holes in the bottom of the freshwater pan, and thought I might do the same for the rest of the belly pan. Good or bad idea?
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Old 07-10-2016, 07:23 AM   #2
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I actually installed small marine clam shell vents with screens between the clam shell and the skin. I installed one , down the center, between each frame cross member section. I wanted some ventilation in there to prevent long term corrosion...or at least slow it.

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Old 07-10-2016, 07:27 AM   #3
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Vents have been used and suggested before. It is best to not let water in that are but it is going to get in there anyway. Ventilation and easy access to the belly pan area is a good idea. Getting rid of bumper plate compartment leaks is a good idea as well. The pink insulation that they used at the factory needs to go because it saturates with water and contributes to the rotting of the frame and floor. I had to replace the last 4 ft of floor in my 81 31 ft and did not put fiberglass insulation back in. I also got rid of the plate that goes under the floor at the back that causes so much problem with funneling water under the floor. My new belly skins bolt on so I can get in there if I want to. I would find your leak and fix it. You should blow water out the vent if you overfill not leak into the tank pan.

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Old 07-10-2016, 07:37 AM   #4
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Belly pan weep holes--a good idea?

Perry- someday when I get around to dropping the belly pan I'll replace with bolts as you mentioned to make it more accessible. The leak at the water door was from where the vent tube was not attached. Easy fix.

dznf0g - great idea with those clamshell vents. So one centered side to side and front to back between each frame rail? How large is the hole in the belly pan for them?
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Old 07-10-2016, 08:02 AM   #5
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"Getting rid of bumper plate compartment leaks is a good idea as well."

How is this done?
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Old 07-10-2016, 08:11 AM   #6
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Originally Posted by KYAirstream View Post
Perry- someday when I get around to dropping the belly pan I'll replace with bolts as you mentioned to make it more accessible. The leak at the water door was from where the vent tube was not attached. Easy fix.

dznf0g - great idea with those clamshell vents. So one centered side to side and front to back between each frame rail? How large is the hole in the belly pan for them?
Yes, on the placement question. You're straining my brain on the other...it's been 4 or 5 years since I did it. But, I went out and got some of those little round plastic siding vents for houses. I made the holes the same size as the vents...perhaps 3/4 or 1"...I want to say 3/4". I used one of those stepped bits for the drill and used very light pressure, so as to get a nice clean hole. Inserted the siding vent and trapped it between the flanges of the clam shell and the skin. I'll peruse the net and see if I can find the pieces for you.


Edit: Here are some examples...shop around for various styles and prices

http://www.westmarine.com/buy/seafit...12_363_001_507

http://ventmastersstore.com/products...aFwaAvqn8P8HAQ

https://www.amazon.com/Neiko-10194A-...step+drill+bit
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Old 07-10-2016, 08:25 AM   #7
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Thanks. That gives me a general idea. I found a bunch of clamshell vents on Amazon, so no need for a net search, but thanks. Great idea on the clamshells BTW.
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Old 07-10-2016, 08:27 AM   #8
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Looks like we posted at the same time. I hadn't seen those round screened vents, so thanks. Those look perfect for the job.
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Old 07-10-2016, 08:29 AM   #9
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Quote:
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"Getting rid of bumper plate compartment leaks is a good idea as well."

How is this done?

Definitely a good idea, but not easily summed up in a few sentences. A Google search for "Airstream bumper leak" or something along those lines should bring up some good threads.
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Old 07-10-2016, 08:29 AM   #10
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Quote:
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Perry- someday when I get around to dropping the belly pan I'll replace with bolts as you mentioned to make it more accessible. The leak at the water door was from where the vent tube was not attached. Easy fix.

dznf0g - great idea with those clamshell vents. So one centered side to side and front to back between each frame rail? How large is the hole in the belly pan for them?
When you do drop the belly pan my guess you will be shocked. Every belly pan that I have seen drop on the forum I have seen mold, rot, dead rodents and wet insulation. When restoring my 55 I used no insulation and apply stainless steel vents to the belly pan. I think it better to have air ventilation then to have the wet insulation. All trailer leak new and old.

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Old 07-10-2016, 11:25 AM   #11
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IMO there is enough ventilation in the belly. They are not tight and flying down the road in the heat will dry it out. I would be afraid to have those vents as easy access for rodents.

When i did my belly pan I used rigid insulation attached to floor. After riveting pan on I made sure there were no mouse sized holes but tiny gaps between each overlapping sheet so air and water can pass through.
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Old 07-10-2016, 11:33 AM   #12
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IMO there is enough ventilation in the belly. They are not tight and flying down the road in the heat will dry it out. I would be afraid to have those vents as easy access for rodents.

When i did my belly pan I used rigid insulation attached to floor. After riveting pan on I made sure there were no mouse sized holes but tiny gaps between each overlapping sheet so air and water can pass through.
As I said, they are screened. No rodents in 10 years. I rodent proofed the entire trailer.
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Old 07-10-2016, 11:57 AM   #13
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You could buy and instal the same variant that is used on airplanes; same concept just correctly sized.
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Old 07-10-2016, 12:01 PM   #14
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You could buy and instal the same variant that is used on airplanes; same concept just correctly sized.
Not familiar. Can you link?
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