Front wall bows in the heat

[JoePete]

I have an 18EC toy hauler... the older style with a flat front wall. The walls are the composite laminate (fiberglass, plywood, interior finish) with no studs. So the front wall is basically attached at the roof, floor, and the two sides at the edges.

In the extreme heat we are having in Texas this summer, when the front wall is facing west and exposed to the afternoon sun, the entire wall appears to bow outward, leaving a gap inside between the front wall and the interior wall of the bathroom and shelving by the murphy bed. The gap is 1/8" in the mornings before the sun hits it, but grows to over 1/2" by mid afternoon. Is this common? Is there a fix? I'm assuming this is from expansion of the wood when it gets hot, and with the top and bottom held in place, the wall bows out in the middle. The bow is definitely largest in the center and barely noticeable at the floor and ceiling.

I posted two photos... one taken in the morning and one in the afternon showing the increased size of the gap.

Thanks

Joe

[Reverse_snowbird]

I don't think it's common, but the extreme heat we've been having isn't common either.
Other then rigging up some sort of shade to keep the afternoon sun off the rig, I don't think there is a solution.

[Ballistic]

Seems fully reasonable considering the co-efficient of thermal expansion between the dissimilar material(s) is not the same. I'd rather have the wall bow outwards some percentage rather than have it be rigid. If it were rigid that wall will be pushing the walls outwards which will not be nice on the joints and seals. Just my 2 cents.

Good thing you're not noticing how much the trailer flexes when traveling down the road or you'd probably have a heart attack.