Why is my bathroom ceiling sweating?

Franco Ondricka asked a question: Why is my bathroom ceiling sweating?
Asked By: Franco Ondricka
Date created: Sun, Apr 11, 2021 1:34 PM

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Those who are looking for an answer to the question «Why is my bathroom ceiling sweating?» often ask the following questions:

❔ Bathroom walls sweating?

The cause is excessive moisture coupled with lack of ventilation. The phenomenon is caused by moisture condensing on the walls and extracting surfactants or other soluble compounds from the paint film. Though often referred to as surfactant leaching, these extracts are not always surfactants.

❔ Bathroom walls "sweating" sticky stuff?

We bought a home last year and the master bath has been beautifully remodeled, however, when you take a shower the walls are sweating. The fan is rated for the sq footage of the bathroom and it is properly working. We think that when they did a faux plastering on the walls they did not take down the old wallpaper and the sticky residue is wallpaper glue.

❔ My bathroom walls are sweating?

What causes bathroom walls to sweat? Bathroom condensation is so annoying, and it’s a common problem in most homes. After a shower or bath, water droplets form on the window, walls and mirror when the warm, damp air is cooled by these cold surfaces. Warm air also holds more moisture, which results in heavier condensation..

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The most common cause of ceiling condensation is an attic with too little insulation and ventilation. In an attic like this, wintertime ceiling condensation can form when cold air from the attic hits your warm ceiling.

Condensation on your ceiling occurs when the attic space above is poorly ventilated and insulated. This traps heat in the attic, which then warms the ceilings. When the cool air from your living space rises due to humidity in your home (often from cooking, bathing, or drying clothes), it comes in contact with the warm surface of the ceiling and condensation forms.

If insulation is blocking the venting at the eaves, or if you don't have enough venting installed. If it is a bathroom built over another bathroom, such as in a two story house, that could create a lot of moisture from below if you don't have enough venting. Lots of older homes have no fans to remove bathroom moisture and that is a problem.

Activities in the home can produce high humidity levels, contributing to the possibility of ceiling condensation. Drying clothes, washing dishes or bathing can produce humid air that should be...

Often there are open gaps between the boot, the ceiling drywall, and the attic. Hot, moist attic air is coming in contact with the back side of the grill and thus the sweat you see is the condensation. Take the register off the worst sweater and see what you find. Sealing them up is often done with caulk.

The cause is excessive moisture coupled with lack of ventilation. The phenomenon is caused by moisture condensing on the walls and extracting surfactants or other soluble compounds from the paint film. Though often referred to as surfactant leaching, these extracts are not always surfactants.

Because it sounds like your attic is cool and you’re in your shower and the bathroom gets super-hot and then there’s no movement of air in that bath and that’s what’s causing that temperature differentiation. TOM: So what happens is the warm, moist air strikes the underside of the chillier bathroom ceiling and condenses. ADAM: OK.

The "sweating" is just condensation on the bathroom walls. It is normal and expected just after a shower. To reduce it, you will need a more powerful fan. I wouldn't touch those "ratings" with a 10ft pole.

Newly constructed home in upstate New York (Cold Climate) with cathedral ceilings throughout. R38 paper faced batts with Sheetrock and T&G pine cover the entire ceiling. After the long winter months have past the warmer weather causes water to come streaming down the inside of the valleys and down the walls for at least 5-6 hours. A roofing contractor said it was caused by ice damning so I ...

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