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A site-built rafter roof with a raised top plate allows for more insulation underneath
A standard site-built roof of rafters may pinch the insulation at the eaves
Above the 20 inches of blown cellulose ultra-efficient attic insulation, Near Zero Maine installed a walkway in the attic to provide easy access to electric wiring.
Adhesive caulk is used to seal seams and attach the multiple layers of rigid insulation
After all holes through the ceiling are air sealed and the baffles have been installed, the insulation can be installed
Air seal and insulate drawer and closet boxes in attic kneewalls
Air seal attic access panels and drop-down stairs to minimize air leakage.
Air seal floor joist cavities under kneewall with rigid foam, plywood, or OSB caulked in place
Air seal the attic access panel with weather stripping
Air seal the attic access pull-down stairs opening with weather stripping
Air seal the attic kneewall door opening with weather stripping
Air sealing tape seals all wood-to-wood joints in the attic.
Attic knee walls are insulated with rigid foam and sealed with spray foam to help form a continuous draft barrier around attic rooms.
Baffles provide an air space over the insulation to guide ventilation air from the soffit vents up along the underside of the roof deck
Design the roof with raised heel trusses to allow full insulation over the top plates of the exterior walls.
Ducts running parallel to trusses have limited width due to truss spacing
Form a sheet metal shield around the flue pipe
Form sheet metal shield around pipe keeping 3-inch clearance
ICF walls and an attic sealed and insulated to R-63 on the underside of the roof deck with 10 inches of open‐cell spray foam plus 2.7 inches of closed‐cell spray foam provide a complete thermal break around this home.
In cathedral ceilings, parallel chord trusses allow thicker insulation levels over the exterior wall top plates
In the attic, all of the top plate seams are sealed with canned spray foam before covering the ceiling deck with blown fiberglass.
Install a continuous air barrier below or above ceiling insulation and install wind baffles.
Install an air barrier on the exterior of attic knee wall insulation and to block open floor joist cavities under attic knee walls
Install an air barrier over dropped ceilings or soffits
Install insulation under platforms constructed in the attic for storage or equipment.
Install wood framing cross pieces in the attic rafter bays on each side of the duct chase
Install wood framing cross pieces in the attic rafter bays on each side of the duct chase
Measure the depth of insulation
Modified truss to allow for raised ceiling sections for ducts
One way to air seal and insulate kneewalls – add insulation and a rigid air barrier along roof line of unconditioned attic space outside kneewall
Open-cell polyurethane spray foam is sprayed on the underside of the roof for an R-28 thermal blanket of insulation that turns the attic into a conditioned space for the HVAC system while sealing out external allergens and pollutants.
Raised ceiling chase sealed with drywall mud
Raised ceiling duct chase installation technique
Raised heel, energy trusses extend further past the wall and are deeper at the wall allowing room for full insulation coverage over the top plate of the exterior walls
Raised-heel roof trusses allow more room at the eaves for attic insulation.
Right - R-100 of blown cellulose covers the floor and rafters of this attic.
Right –  Attic access hatch has been properly insulated by attaching a fiberglass batt, gasketed, and opening has blocking
Right – Air barrier is present between the dropped ceiling/soffit and the attic
Right – Air barrier is present between the dropped ceiling/soffit and the attic
Right – Attic access door has foam and rubber weather stripping installed that remains in contact when closed
Right – Backing air sealed prior to insulation
Right – Blocking has been installed around the perimeter of this attic access to prevent insulation falling into the house
Right – Framing allows for required insulation depth
Right – Framing and wind baffle installation will allow for required insulation depth
Right – HVAC platform installed to allow for proper insulation depth
Right – Insulation installed to correct depth and will be aligned with air barrier
Right – Properly insulated, backed, and air sealed knee wall
Right – Rigid backing installed prior to insulation
Right – Seams and penetrations of air barrier properly sealed
Right – Top and bottom plates installed prior to backing and insulation
Right – Wind baffle installation maintains necessary code clearance between baffle and roof deck
Right – Wind baffle installation will allow proper insulation depth over the top plate
Right-- IR photo shows how effectively spray foam insulated/air sealed attic kneewall and the floor cavities under kneewall