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Old 12-15-2020, 06:35 AM   #1
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Foam spray around underbelly?

Recently bought a new/slightly used 2021 TT. Noticed that the dealer did a pretty lame job sealing around the low level lines that extend out the underbelly. Notice most of the hole is sealed with some type of spray foam. Want to do a better job sealing up gaps between lines and underbelly material. Any suggestions? What type of spray foam would make the most sense for this? Trying to leave as little opportunity for those little fury creatures robbed down in the trailer over the winter. Thanks!
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Old 12-15-2020, 06:41 AM   #2
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I used this from local hardware store.Click image for larger version

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Old 12-15-2020, 08:39 AM   #3
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You can also use Landscape Spray Foam, and it's black so it matches the Coroplast better than the tan or white stuff.
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Old 12-15-2020, 09:00 AM   #4
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Here's another brand... it's grey.
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Old 12-15-2020, 02:12 PM   #5
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Out of curiousity.

Would regular expanding spray foam work the same?
Or does it have to be a critter repellant?

Reason I ask, I used the Home Depot / Lowes stuff.
Some show as fire block foam.
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Old 12-15-2020, 02:49 PM   #6
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Sealing under belly

I used black urethane caulk over the spray foam.
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Old 12-15-2020, 03:03 PM   #7
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Amazon has the black stuff from "Great Stuff" foam. It appears to be the same thing the factory uses. It comes in a landscape/pond/stone version and a "multipurpose" can. The Multipurpose version even has a RV on the front of the can. Some ACE hardware stores carry it, and I have seen it at HD before on the shelf, but it can be ordered from Amazon if need be. Google to see if a store near you stocks it. There is more than one label I've seen on the multipurpose black foam.

Also if you use the regular great stuff, just spray it with black paint to protect it from UV light and it should be fine.
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Old 12-15-2020, 03:12 PM   #8
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Different foams for different purposes. Common foam is just that, pretty rigid, may burn, degrades in sunlight. Fire Block has chemical additives to keep it from burning/melting. Anti critter has something to probably kill anything that tries to eat it or at least makes it unappetizing. Pond foam does a good job of creating a water proof seal and I think is a bit more flexible than others and resistant to sunlight.
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Old 12-15-2020, 03:33 PM   #9
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And for the record, the factory does that foam sealant, not the dealer.
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Old 12-15-2020, 03:36 PM   #10
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Quote:
Originally Posted by Bama Rambler View Post
You can also use Landscape Spray Foam, and it's black so it matches the Coroplast better than the tan or white stuff.
Of course not many people look at the bottom of trailers so is "color matching" that important?

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Old 12-15-2020, 03:39 PM   #11
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I used the Great Stuff Pest Block to seal along the rim joist of my house to try to reduce the number of mice we get in the walls. It didn't seem to make a difference.

The 2 greatest mice attractants in an RV are warmth and food. Even tiny food crumbs will draw them in. Don't give them a reason to explore your RV.
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Old 12-15-2020, 04:32 PM   #12
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Quote:
Originally Posted by TitanMike View Post
Of course not many people look at the bottom of trailers so is "color matching" that important?

For me it became an issue. (OCD I suppose!)

I sealed a couple areas of my 5th wheel with the regular spray foam because I had some here at the house that I hadn't used.

Standing/walking around the R/V you never see it.
Setting at the fire pit 15'-20' out away from the R/V and at lower level eyesight, it bugged the hell out of me so I spray painted black over it.

If I had it to do over I would have used black foam to begin with!

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Old 12-15-2020, 06:56 PM   #13
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Spray foam

I used regular spray foam then used rubberized undercoating sprayed over top of the foam. Be sure to wait till the foam is dry.
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Old 12-15-2020, 08:40 PM   #14
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OK! Glad to hear I can use generic. Since I sprayed inside around plumbing, guess I have no need to worry about UV rays and coloring the foam black.

Thank-you
Everyone Stay Safe, Stay Healthy and Enjoy your Holidays
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Old 12-16-2020, 10:04 AM   #15
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I just use regular Great Stuff foam. Not noticeable underneath the trailer, and it has held up for several years. Had to respray after installing the hitch on my fifth wheel.
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Old 12-16-2020, 10:21 PM   #16
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Tip for using it in hard to reach spots. Buy some 1/8 inch tubing that fits over nozzle. Wire tie it to nozzle. Have about 2 feet. Tape a stick on end. Have enough that you can still turn can upside down. Be ready to try to complete all spots, hard to clean out tube. I seen it somewhere. Maybe You Tube. Works well. Cover ground with cardboard. Wear old clothes and esp. a hat. Watch you do not slide into drips. I did.
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Old 12-19-2020, 07:36 AM   #17
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Wear rubber gloves and safety glasses! That stuff sticks. When I worked for the Forest Service we would pack coarse steel wool in the holes and then use the foam. It solved the mice problem in our trailers. Great Stuff sold at Home Depot works fine. They make one for windows and doors that doesn't expand quite as much. It can be trimed with a sharp knife or electric knife, and spray painted if you wish.
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Old 12-21-2020, 08:00 PM   #18
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If you have one or more slides, do this:
At night, with the slide in, get some bright work lights and turn them on inside the camper pointing the the slide floor area. Then get under your camper and look at the underside of the camper to see if any light is coming through. Mark these areas. Repeat this exercise with the slide out. These are the areas you want to seal. You may be surprised at what you find. When our slide was out on our 2017 Salem 27rkss, I could not see any light coming through. But when the slide was in, it looked like a mouse interstate with vacancy signs.

Be careful not to foam any moving parts, or adhere the stationary part of the camper to the slide (don’t ask how I know).
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Old 12-21-2020, 08:19 PM   #19
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Make sure your foam is waterproof

The standard can of great stuff foam soaks up water like a sponge. I used waterproof Gorilla Tape to seal all the tears in the polyvinyl mainly to keep the mice out. But before I did that I threw in those Square green poison rodent chunks so if anything got in there it would have a snack that would kill it. Then I took my foam nozzle with my waterproof Landscaping foam and filled the cavity around the pipes, and wires. It's been two years now the repair was 100% effective and the foam holds all of the plumbing and wiring very secure from vibration.
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Old 12-27-2020, 11:01 PM   #20
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This is what the Forest River Diesel Division uses for spray foam.
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