Unvented Attic Problems

The energy savings touted by unvented attics can be as high as 20.

Unvented attic problems.

However if moisture is able to enter the unvented attic space it may lead to roofing panel issues. Heat and moisture buildup in an attic cause predictable but different problems in hot and cold climates. Unvented conditioned attics were quite rare before the 1980s. Roof vents are for warmer climates.

Too many people believe the importance of roof ventilation is to increase energy. Here is a sampling. Heat is thus less likely to escape into an unvented attic from hvac equipment and if it does it will remain within the conditioned space. An unvented attic is conditioned space and won t be subject to the extremes of temperature common to vented attics.

Unventilated attics can help to mitigate energy loss through leaky ducts or ceiling fittings. The intent of this brief is to provide code related information about controlling moisture in unvented attics by installing a vapor diffusion port vent that would convey water vapor from an unvented attic to the outside when air permeable insulation materials are installed and can be verified as being in compliance with the related codes and standards for residential construction. Attic ventilation myths that are off the charts 1. More attic ventilation is good.

Just like properly sizing your furnace and air conditioning unit you want precisely. Among the early promoters of conditioned attics was joe lstiburek a principal of the building science corporation. Lots of gba readers have posted reports of this type of problem.