about 2 years ago I replaced the old entertainment center and TVs in our couch, In doing so I noticed the insulation over forward portion of the coach was wet. Thinking leak, I removed the wet stuff, Then I sealed all the seams with Eternabond tape as per instructions for use. ran all new HDMI cables, then replaced the insulation. all was well until I was required to replace the HDMI cable, I noticed the same wet insulation. the Question is how do I determine if it is condensation reoccurring ?I have checked for leaks during the heavy rain this passed week. shows nothing on any seam I can see where the wet insulation is.the cabin roof where this is occurring is simply 1 layer of fiberglass with 1 seam across the roof, which is sealed with tape.

If you have clearance lights in that area you may want to check them. The silicone that is usually used is not very good. I redid all of mine with Dicor and eternabond.

msturtz wrote:If you have clearance lights in that area you may want to check them. The silicone that is usually used is not very good. I redid all of mine with Dicor and eternabond.the wet is about 4 feet back and up hill from the lights. after being open all night it is dry.never has been wet enough to leave a stain on the ceiling

Maybe as stated lights and is your antenna and if you have that mini battery charge in that area. Maybe wind driven when you are driven. I got it on my 99 same thing. Could really never find it but removed the light and seal them along with the antenna and charger line. It did go away, but as stated never did find a leak. Every looked good when taken apart.

Check the bolts holding your air conditioner -- That`s often the cause of leaks toward the front, & elsewhere - Bill Willard

William Willard wrote:Check the bolts holding your air conditioner -- That`s often the cause of leaks toward the front, & elsewhere - Bill WillardDid the complete re-seal of all the roof mounted stuff 2 years ago.the forward air/con unit is about 8 feet back from this location and the insulation is dry between the two.Is there a substance that can be applied to the underside of the fiberglass that will stop the condensation ?

condensation or leak? | Good Sam Community

msturtz
Explorer
Dec 22, 2018
If you have clearance lights in that area you may want to check them. The silicone that is usually used is not very good. I redid all of mine with Dicor and eternabond.
Tom_Barb
Explorer
Dec 22, 2018
msturtz wrote:
If you have clearance lights in that area you may want to check them. The silicone that is usually used is not very good. I redid all of mine with Dicor and eternabond.

the wet is about 4 feet back and up hill from the lights.

after being open all night it is dry.

never has been wet enough to leave a stain on the ceiling
MountainAir05
Explorer II
Dec 22, 2018
Maybe as stated lights and is your antenna and if you have that mini battery charge in that area. Maybe wind driven when you are driven. I got it on my 99 same thing. Could really never find it but removed the light and seal them along with the antenna and charger line. It did go away, but as stated never did find a leak. Every looked good when taken apart.
William_Willard
Explorer
Dec 22, 2018
Check the bolts holding your air conditioner -- That`s often the cause of leaks toward the front, & elsewhere - Bill Willard
Tom_Barb
Explorer
Dec 22, 2018
William Willard wrote:
Check the bolts holding your air conditioner -- That`s often the cause of leaks toward the front, & elsewhere - Bill Willard

Did the complete re-seal of all the roof mounted stuff 2 years ago.
the forward air/con unit is about 8 feet back from this location and the insulation is dry between the two.

Is there a substance that can be applied to the underside of the fiberglass that will stop the condensation ?
doxiemom11
Explorer II
Dec 23, 2018
I don't know if we would have condensation or not, but we keep the doors ajar for the cabinets on either side of the tv. They hold the other electrical components. It is very warm up there from use, or sun, and then if it's cold at night, condensation could happen. Try leaving the doors open just a bit and see if the problem happens again.
rgatijnet1
Explorer III
Dec 23, 2018
I had a condensation problem during the Winter in the upper front cap on my Monaco coach. The only way I corrected it was to remove the shifting fiberglass insulation and replacing it with spray on two part foam insulation.
Tom_Barb
Explorer
Dec 23, 2018
rgatijnet1 wrote:
I had a condensation problem during the Winter in the upper front cap on my Monaco coach. The only way I corrected it was to remove the shifting fiberglass insulation and replacing it with spray on two part foam insulation.

I have thought of doing that, and still may, But I have a few wires and cables up there that may some day need replacing.

For now, I've packed the area full of fiberglass insulation, we will see how well that works.
Executive45
Explorer III
Dec 23, 2018
Tom/Barb wrote:
rgatijnet1 wrote:
I had a condensation problem during the Winter in the upper front cap on my Monaco coach. The only way I corrected it was to remove the shifting fiberglass insulation and replacing it with spray on two part foam insulation.

I have thought of doing that, and still may, But I have a few wires and cables up there that may some day need replacing.

For now, I've packed the area full of fiberglass insulation, we will see how well that works.

Most likely that will only get you soaked insulation. If it's condensation only air flow will keep it dry. If it's from a leak, you'll have ugly wet insulation which leads to mold.....Dennis
wildmanbaker
Explorer
Dec 24, 2018
You need a vapor barrier to prevent moisture from reaching the cool outer shell where it is condensing. As Dennis said, just stuffing it with fiber glass insulation will only get you more wet insulation. Without deconstructing the interior of you MH, about the only way to fix it is to have it spray foamed, as rgatijnet1 said. You can buy small kits to DYI, or try to contact a insulating company for an estimate.