Fully Sealed Attic

Unventilated attics can help to mitigate energy loss through leaky ducts or ceiling fittings.

Fully sealed attic.

Find a diagram of common air leaks here here s a quick primer on fixing draft prone spots. A fully insulated attic helps your house regulate temperature and airflow. Sealed and insulated the attic hatch helps keep heat in. Sealed attic construction by excluding vents to the exterior can be a good way to exclude moisture laden outside air from attic and may offer a more easily constructed alternative for air leakage control at the top of residential buildings.

The number one prep step. Sealing attic hatch attic door to properly seal your attic hatch also known as an attic door or scuttle hole at a minimum you should apply weather stripping and ensure the attic side of the attic door is insulated. Ducts are located within an unvented crawl space. The energy savings touted by unvented attics can be as high as 20.

Gaps in the attic or between the lower floors and the attic will let heated or cooled air escape to the great unconditioned outdoors making any insulation you add essentially useless. All joints cracks and penetrations in the wall air barrier shall be fully sealed with caulk foam or equivalent. A fundamental requirement of an unvented attic assembly is the use of air impermeable insulation on the underside of the unvented roof to prevent air infiltration and exclude airborne moisture from the attic. Jump ducts which do not directly deliver conditioned air from the hvac unit may be located in attics if all joints including boot to drywall are fully air sealed with mastic or foam and the jump duct is fully buried under the attic insulation.

It also prevents unwanted critters like raccoons from moving in. However if moisture is able to enter the unvented attic space it may lead to roofing panel issues.