Bottom trailer insulation sagging

[RVNewbie]

Hey all. I recently bought my 2015 Jayco 28BHS. It has the thermal package. I noticed some of the black stuff sagging down around in the rear of the trailer. It is like a cross between cardboard and foam. What is this? I am assuming it is the floor insulation. I did not see any screws—how is it secured?

Thanks as always! This forum is great.

Andrew
2015 Jayco 28BHS, ‘99 2500 Suburban

[Rustic Eagle]

A "little" belly sag in spots is normal assuming your referring to the underbelly cover material..., but check to make sure that none of the tanks (fresh, grey, etc.) didn't drop from it's support straps, and/or acquire a leak.

If required, you can use a couple self tapping screws to shore the black underbelly material (Coroplast) up but insure your screwing into the TT's metal frame members thus avoiding electrical, plumbing, tanks, etc..

Bob

[RVNewbie]

Thanks for the info. The under carriage is on an extended warranty but I would like to avoid the service charge —while also avoid nullifying my warranty. I am sorely tempted to cut one of the taped portions to get a peak, and then retape it. My trailer sits on the side of my house acting as a additional space when we are not staying at parks or camping. This: the trailer isn’t contained in an RV cover. How long of self tapping screws are safe to use?

Thanks again.
2015 Jayco 28BHS aka “The Cabin”
454 Vortec Suburban 4x4 3.73 gears

—-aka “The Guzzler”

[Rustic Eagle]

There should be some existing factory screws holding the Coroplast in place to use as a reference screw size. In some spots on my prior TT's underbelly I added a larger washer to the existing screw head because the screw was working thru the Coroplast.

IMO a zinc plated #8 or #10 x 1" long, hex washer head self tap/drilling screw should do the job.

Bob

[RVNewbie]

It helps to know that it is called “coroplast.” I am going to contact the warranty company this coming week. I haven’t taken it in a month and I am getting itchy!

[groundhog72]

It's really not a big deal. Mine bellys all over the place. ( 38 ft) Above the coroplast is another bottom cover with insulation above it. The coroplast is more like a splash guard if you ask me. Sure it helps with the wind and maybe some drafts.. If you have a slide there should be access covers to the motors cut into the coroplast. Take it off and pop your head in there and see what you have. That's how mine is set up anyway. Good luck

[travelingjw]

Use 3/4 or 1" self tapping screws. If fastening to the frame, pre-drill with a smaller hole first. If the sag is deep, better to cut a slot to check to assure that there is no leak nor has anything come loose. If you cut a slot you can just use black duct tape to seal it. If you want to cut a square, no problem. You can glue some paint sticks about 2" longer on each side to the top of the square you cut out. Then when you put the piece back in you can use 3/4" in screws with a washer to refasten. But seal the edges with duct tape.