Converting Vented Attic To Unvented

A secondary goal is to vent moisture that infiltrates the attic from the conditioned home.

Converting vented attic to unvented.

Poorly insulated ducting can cause heat loss in colder months and the loss of conditioned air in the summer in vented attics. The loss of energy efficiency means some designers choose to move the ductwork into the conditioned areas of the home and leave the attics unvented. Should i use open cell or closed cell foam to insulate. I live in maryland and own a house that has the hvac system in the attic.

In colder climates the main purpose of a vented roof is to keep the roof cold and reduce the formation of ice dams. From my research it looks like the best option is to make the attic a conditioned nonvented space. A 1 and story home with a room located in the attic and the thermal boundary located at either a the walls and ceiling of the attic room with small vented attic spaces or b the roof line for an unvented attic. An unvented attic system relies on an air seal and no vents to make the attic a conditioned space.

I m considering converting my vented attic into a non vented conditioned space. Asked by gary lichtenstein. I ve been warned that closed cell foam can lead to sheathing rot from either roof leak or vapors from the house. Currently the attic is vented and has zero insulation anywhere.

If you convert your vented unconditioned attic to an unvented conditioned attic by installing open cell spray foam on the underside of your roof sheathing you may be surprised to discover that your attic is now the most humid room in your house. I ve been researching several methods to insulate my attic. Converting an attic from vented to unvented can reduce utility costs while improving comfort indoor air quality and durability. There s potential problems when converting from an open vented system to a sealed system as this homeowner found out.

I m converting my attic into a non vented conditioned space.