Converting Vented Attic To Unvented

I m unsure of what to do and i m unsure of the most. 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. In colder climates the main purpose of a vented roof is to keep the roof cold and reduce the formation of ice dams.

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Asked by gary lichtenstein.

Converting vented attic to unvented.

I live in maryland and own a house that has the hvac system in the attic. 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. 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. By using an air impermeable insulation like spray foam on the roof deck will stop any air movement.

Vented roofs serve a number of different purposes and their roles vary from climate to climate. A secondary goal is to vent moisture that infiltrates the attic from the conditioned home. I ve been warned that closed cell foam can lead to sheathing rot from either roof leak or vapors from the house. Should i use open cell or closed cell foam to insulate.

There s potential problems when converting from an open vented system to a sealed system as this homeowner found out. An unvented attic system relies on an air seal and no vents to make the attic a conditioned space. Converting an attic from vented to unvented can reduce utility costs while improving comfort indoor air quality and durability. Currently the attic is vented and has zero insulation anywhere.

Poorly insulated ducting can cause heat loss in colder months and the loss of conditioned air in the summer in vented attics. I ve been researching several methods to insulate my attic. I m considering converting my vented attic into a non vented conditioned space. From my research it looks like the best option is to make the attic a conditioned nonvented space.

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

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