Hey guys,

I was messing around yesterday and decided to replace the stereo system in the camper. I bought some new speakers and a nice Kentwood car stereo to swap out the old monster. When I was removing the speakers in the ceiling in the living room I could feel moisture in the insulation between the ceiling and the roof. So I decided to check the speakers in the bedroom and found the same thing. Not really soaked, but damp and very warm. It was sunny and hot outside yesterday but could that have caused the dampness? Could it be humidity due to the heat? Do TTs have some sort of vents for this area? I looked all around the outside of mine and didn't see any vents.

Just a little concerned and looking for some answers. Thanks!

Most trailer manufacturers will construct with a vented air space between the roof and the insulation similar to how a house is made but on a much smaller scale. It needs some air in there to prevent condensation and then the ensuing mold and wood rot. My vents are on the roof.

Your's must have some ventilation, it'd be irresponsible manufacturing to not build it that way.

Maybe you have a small leak?

Hello Richard,

I haven't climbed up on the roof to check yet, but you're probably right. I'm wondering if, since it was a hot muggy day without a lot of breeze, some moisture might have built up in that area. I checked the whole roof inside and didn't find any water damage. I'll have to climb up there tonight to see about the vents. Any idea what they look like? We have a lot of bees and I'm hoping if there are vents up there, they didn't get clogged by the insects. Thanks again!

Mine are small upside down bowl shaped covers about 4" in diameter mounted over the vent tube. They ride about 2 or 3 inches above the roof surface. There are three or four of them spaced along the length of the trailer.

Thanks again Richard,

I'll check it out when I get home from work and keep my fingers crossed. I would really hate to have to replace or re-seal the rubber roof.

Jeff

http://www.pplmotorhomes.com/parts/rv-vents/rv-plumbing-vents.htm

These are the types that are on top of my 5-er, they seem to do a very decent job. Easy to install post construction.

Yep, those are what mine look like. But I think it'd be a real challange to install roof vents if the manufacturer didn't put any in.

Hey Guys,

I finally got a chance to climb up on the roof. I found two vents like the ones in the link from Frank. One problem, one of the caps was missing completely! I'm really hoping that this wasn't letting rain or other moisture into my ceiling area. I plan on getting a new one today to install as we are scheduled to have rain almost all weekend. Keeping my fingers crossed as I haven't seen any moisture damage yet. Thanks for the help!

Jeff

Jeff:

You only saw two vents? I would have to think what you're seeing are the vent stacks for your holding tanks (one for the black tank, one for the grey), and not something for ventilating the area between your roof and ceiling.

A vent stack is necessary so that air can escape (or enter) the tank as it fills (or empties).

Your fresh water tank has a vent too. However, it's not vented through the roof. It's either vented at the water filler or the overflow tube (that exits through the floor) serves as the vent.

I scrub my roof once or twice a year so I know what's up there. The only vents protruding through my roof (excluding the skylights and A/C unit) are the two vent stacks (mentioned previously) and the vent for the refrigerator. There are no other vents on my roof.

I don't claim to be an expert in RV costruction but if a manufacturer is actually using an RV plumbing vent for ventilating the area between roof and ceiling, I can't see how several two inch holes could be very effective at doing the job unless there was something (like a fan) to create airflow. There would also be some water coming down the vent, especially while underway in the rain. Water would get blown into the vent by the near hurricane force winds whether the cover's present or not.

My guess is your moisture is condensation from cooking, showering, and moisture from you and your family occupying your rig. It's a good idea to leave a vent "cracked" while using your trailer to allow the moisture to get out. We usually leave the one in the bathroom open an inch or two, summer and winter.

We've had five trailers in 14 years but none of them had vents specifically for venting the "attic area" of the roof....