Attic Moisture On Drywall Ceiling

It s also incorrect in a way.

Attic moisture on drywall ceiling.

All attics vented or unvented should have an air barrier a properly detailed airtight drywall ceiling for example regardless of climate. The heat being lost from the house below warmed up the attic so that moisture. If the ceiling had been insulated the vapor barrier would have. Moisture resistant drywall is called greenrock and is specially treated for use in bathrooms and other damp areas.

The most commonly used drywall thicknesses are 1 2 inch and 5 8 inches thick. Before the introduction of attic insulation attics in cold climates were poorly insulated and plastic ceiling vapor barriers were omitted. Depending on how tight a house is constructed and the outside temperature even a relative humidity of 30 percent may be too high. At higher levels relative humidity condensation can even occur inside of the house on windows cold walls or ceiling surfaces.

The next approach to reducing attic moisture is by controlling air infiltration. If you notice condensation on your windows and walls find peeling wallpaper or bubbled paint or see mold spots around the house your home s humidity is too high. However all attics vented or unvented and in all climates should have an air barrier such as an airtight drywall ceiling. Typically plaster ceiling cracks have two causes.

Second when water condenses and drips off of your ductwork it can cause your ceiling to leak which can rot drywall and cause your ceiling to collapse over time not to mention it looks horrible. The standard panel is 4x8 feet although 10 foot and 12 foot panels are available. Omitting a ceiling vapor barrier by arguing that you have to let the moisture escape or because the house has to breathe out the top is actually correct in a way. When they do the drywall finishing the drywall on the ceiling may sag from moisture.

This is usually because they have not insulated the attic before beginning the drywall finishing. Sometimes your daily activities add more humidity to the air than your home can handle leading to a buildup of moisture. Finally and most importantly condensation on ductwork can then drip off of your ducts and feed mold growth. Condensation on your ceiling can cause water damage and promote the growth of mold or mildew.

House settling and temperature or moisture fluctuations in an attic which result in the expansion or contraction of framing members. Check local codes for specific requirements of your area.