Air-Sealing and Insulation

Higher R-values in exterior walls and ceilings mean less energy loss and lower heating and cooling loads. This has been accomplished in the Eastport Renewable Energy home through the use of blown-in insulation in all exterior walls and blown-on cellulose insulation in attic areas, which in addition to producing higher R-values, eliminates voids and gaps around pipes and openings. An additional layer of exterior R-10 rigid insulation runs around the foundation from grade level to 4 feet underground, to insulate down to the frost line. The deeper earth, with its constant, year-round temperature is allowed to regulate the temperature of the basement areas, keeping it naturally cool in the summer and warm in the winter.

Any possible points of outside air infiltration, such as joints in plywood, around sill plates, window frames outlet boxes and lights, have been blocked and sealed, so that the entry of air into the home is nearly eliminated. Air infiltration is regulated and controlled by exhaust fans on timers, to prevent an unhealthy lack of ventilation (sick house syndrome). Additional blocking and sealing prevents air-infiltration in often overlooked areas between conditioned and unconditioned space and eliminates drafts through vertical spaces and shafts.

For moisture control, a smart vapor-retarder sheet is integrated into all exterior walls, keeping moisture infiltration at an optimal level during all seasons. This curbs heating losses due to moisture migration and prevents the build-up of mildew and mold.

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