See where the studs are

[OceanMountains]

Any idea why you can see where the studs are?
We didn’t notice them earlier in the year.
Not sure if a good wash & wax will take care of it.

[ependydad]

Is it condensation or discoloring?

[Sunseeker16]

Depending on temperature and humiditiy conditions I can see all of the studs on mine. Once the sun comes out and air temps warm the marks go away.

[Iwritecode]

Originally Posted by Sunseeker16

Depending on temperature and humiditiy conditions I can see all of the studs on mine. Once the sun comes out and air temps warm the marks go away.

^^^This.

There's probably some scientific answer about the area where the studs are being warmer or colder and the fact that the trailer walls are really thin.

Nothing to worry about anyway.

[BehindBars]

If this condition is temporary from condensation, consider this phenomenon a benefit in case you ever need to know where the wall framing is.

[simiHal]

Originally Posted by Iwritecode

^^^This.

There's probably some scientific answer about the area where the studs are being warmer or colder and the fact that the trailer walls are really thin.

Nothing to worry about anyway.

Not a tremendously scientific explanation but the studs are aluminum with styrofoam insulation in between. Metal and fiberglass are NOT good insulators so they will absorb the reflect heat or cold. You’re likely seeing the aluminum stud absorbing warmth from inside and creating condensation frost from the cold on the outside.

[Richy R]

Originally Posted by simiHal

You’re likely seeing the aluminum stud absorbing warmth from inside and creating condensation frost from the cold on the outside.

Condensation occurs on surfaces that are at or below the condensation temperature. Anyone familiar with the terms DRY BULB/WET BULB and RH (RELATIVE HUMIDITY) and DEW POINT?

Where the condensation occurred, the surface temperature was at or below DEW POINT. Where the condensation did not form, the surface temperature (DRY BULB) was above DEW POINT.

Richard in Milwaukee (retired HVAC service tech and steamfitter.)

[cboss]

Take a pic...so you know where the studs are!

[BehindBars]

Originally Posted by simiHal

Not a tremendously scientific explanation but the studs are aluminum with styrofoam insulation in between. Metal and fiberglass are NOT good insulators so they will absorb the reflect heat or cold. You’re likely seeing the aluminum stud absorbing warmth from inside and creating condensation frost from the cold on the outside.

Not quite. The aluminum is not creating frost. In the photo, the aluminum is creating voids in the condensation.

The aluminum is a better conductor of heat than the fiberglass and polystyrene behind it. The aluminum is conducting heat from the inside, resulting in slightly higher temperatures on the exterior where the framing is. This is creating voids in the surface condensation where the framing resides. The fiberglass/polystyrene backed surface is below the dew point. The fiberglass/aluminum backed surface is above the dew point.

[ependydad]

Originally Posted by cboss

Take a pic...so you know where the studs are!

I usually do pictures and I'll even take measurements off of windows and whatnot.