Hi all, our Phoenix summer temperatures are causing problems with the bathroom walls in our PW Excel. It is an 09, and the temperature inside the RV sometimes is 115 even with the fantastic fan vent open and the bathroom door left open. The RV sits in our driveway at home when not in use. Of course our summer temps here are HOT (100 - 115 daily)! So the inside of the RV cooks. The problem is that the caulking in the bathroom is separating, leaving gaps between the walls. The same thing is occurring on the bathroom counter top where it meets the wall. Also for those of you familiar with the PW Excel, there is a wall panel attached to the bathroom wall above the window that looks like a formica type panel. The edges are becoming completely separated from its backing due to the heat warping it. Here's my questions. First of all, is there a better caulking that I can use to recaulk the seams between the bathroom walls, and secondly is there a good adhesive that could be used to reattach the formica type panel where it is warping off the wall? Since it is the edges that are warping, I can't get behind the whole panel and would need to drip some adhesive into the gap and tape it shut until it cures. Thanks for any info......Don in Phoenix.

I cant speak to the caulking. But we found a tarp with the aluminum side facing out and over the top of the RV and bungeed down dropped the temp inside. This year we are also taking a misting system to help with cooling since our AC doesnt work well in temps over 90oF. But maybe you dont want to plug it in and run the AC?

If I plugged it in and ran the rooftop AC, it would run constantly in our hot summer weather and trying to put a cover over a class B RV would be tough because we also use it as a second vehicle and like to drive it occasionally. There isn't anything I can do about keeping the RV cool here, but I do need to address the interior issues I mentioned caused by the heat. Thanks for your input.

Hi, RE: Caulking. The absolutely best caulking I have found is what aluminum gutter installers use to seal outside home gutters.By chance I had to replace a wall unit A/C that I had installed 3 years ago and used it to seal the edges. It was still in great shape and had held its elasticity very well. On the inside it stuck so well that it pulled a thin layer off the paneling.Now the BAD part is I don't remember the name of it but as I recall it was around 8-10 bucks a tube.

Sounds like something you may have to address every couple of years. You might ask the RV repair places in your area what they recomend.

I'll be bringing it to an RV service center soon for another issue so I'll ask them about the interior issues. In my opinion, if PW sells RVs all over the country, they should be designed so that they can withstand the weather extremes where they sell them. In the Southwest deserts it gets very Hot in the summer and that does not mean that the bathroom caulking and formica panels should get ruined. I don't have an air conditioned RV garage so it has to stay in our driveway. Sorry, I'm a little frustrated. Thanks for your input......Don.

heat causing problems inside RV | Good Sam Community

Arizona_Kid
Explorer
Jul 11, 2013
scarpi wrote:
For your info its been a few days since I emailed PW about the heat affecting the interior materials in my RV. Still no response. They may not respond and I don't expect them to do anything about it. It is out of warranty being an 09. But it would be nice if they knew of a better caulk to use that withstands high temps. I will wait before I attempt to fix the caulking to see if they have any suggestions on a product. If not, I'll check with my RV service center. I'm sure they can recommend something.

Call them, Email will be very slow.
drsolo
Nomad
Jul 11, 2013
you might want to talk to heating/furnace installer. they may know of caulk that works better. Have you dont an amazon search for high temp caulk?
scarpi
Explorer
Jul 11, 2013
I'm not so sure it is just a heat problem because as one person responded, he lives near the coast and has similar problems with his PW. Although I am sure that the high heat only makes the problem much worse. I'm not in a rush to fix the issues, I will eventually get it repaired myself after gathering information on the best way to do it. You see, the interior side of the exterior wall in the bathroom is actually separated from the caulking on the wall it attaches to next to the toilet. The wall actually moved about 1/2 inch from its original position. I can recaulk it, but it would not be in the original place it was. Of course that might not really matter much. There is no way to put the wall back where it was when new. Just kind of a shame that you walk into this beautiful RV and see cracking caulking, separated walls, a formica panel coming off the bathroom wall, and a warped ceiling near the front top cabinet near the cab. It is only an 09 with 7000 miles on it. But keeping my perspective, it is not a big problem in life, it is only a "thing" that can be repaired. Good health to all and thanks for the tips.....Don.
Darrah
Explorer
Mar 26, 2014
I know this is an older post, but I'm having the same problems in my Majestic Tour after this past winter.
So I was wondering if anybody found a better chulking? or any other solutions to this problem?
mlts22
Explorer
Mar 26, 2014
I don't know if the HOA supports it, but I'd look into an extended height carport. That way, you can not just get the sun off the Excel directly, but have the ability to open a roof vent and run a fan (I'd probably use a box fan) to keep the air circulating inside.

If a carport is a no-go, I'd look at a Maxx-Aire cover for the ventilation cover, a Fantastic Fan upgrade (preferably to a model with a thermostat), and use that to keep air moving. Yes, both of these cost electricity, but this is definitely a lot cheaper than constantly running the A/C.
Darrah
Explorer
Mar 28, 2014
Ok, went to the home store last night and picked up some GE extreme temperature silicone caulking to redo my bathroom with.
I'll let everyone know how well this work's or not...
Sukiesmom
Explorer
Mar 28, 2014
Thank you. Look forward to your report :)
Darrah
Explorer
Mar 31, 2014
Ok, last Friday night I spent about three hours removing any and all of the old caulking that was loose or cracked.
Then Saturday morning I spent about two hours applying the new GE extreme temperature silicone caulking.
The new caulking was easy to work with and has a total cure time of 24 hours wich was nice.
Only took one tube to redo the bathroom and there was a little left over.....
So now time will tell if it well last.
Darrah
Explorer
Aug 05, 2014
Update time: its been a few months since I've used the GE extreme temperature silicone caulking in my Class B bathroom and it seems to be holding up very well.
So I would recommend it for those in hot areas.

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