Seal the attic access.
Fully sealed attic.
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.
The attic space becomes indirectly conditioned as a result of the air leakage heat transfer and vapor diffusion through the ceiling.
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.
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.
The number one prep step.
The energy savings touted by unvented attics can be as high as 20.
A full day complexity beginner cost 51 100.
However if moisture is able to enter the unvented attic space it may lead to roofing panel issues.
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.
Apply self adhesive foam weatherstrip tape to the top edge of the stop.
All joints cracks and penetrations in the wall air barrier shall be fully sealed with caulk foam or equivalent.