Fully Sealed Attic

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. However if moisture is able to enter the unvented attic space it may lead to roofing panel issues. The attic space becomes indirectly conditioned as a result of the air leakage heat transfer and vapor diffusion through the ceiling.

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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.

Fully sealed attic.

All joints cracks and penetrations in the wall air barrier shall be fully sealed with caulk foam or equivalent. Find a diagram of common air leaks here here s a quick primer on fixing draft prone spots. Attic insulation shall be installed at all flat and sloped surfaces adjoining the conditioned space with less than 2 gaps voids and compressions and at levels that meet or exceed prescriptive levels specified by the 2012. 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.

Weatherstrip the attic access hatch or door. Cut 1 3 boards to fit the perimeter of the opening and nail them on with 6d finish nails. Unventilated attics can help to mitigate energy loss through leaky ducts or ceiling fittings. Apply self adhesive foam weatherstrip tape to the top edge of the stop.

The energy savings touted by unvented attics can be as high as 20. Seal the attic access. A full day complexity beginner cost 51 100. The number one prep step.

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