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A builder, energy efficiency consultant, and crew supervisor inspect a spray foam installation.
A continuous layer of polyethylene covers the crawlspace floor and is attached to the wall with wood nailing strips
A gut rehab that includes drywall removal provides the opportunity to thoroughly insulate the walls.
A nylon draw band and tensioning tool are used to secure the inner coil of the pre-insulated flexible duct
A nylon draw band and tensioning tool are used to secure the inner liner of the pre-insulated flexible duct
A paint-on waterproofing covers the exterior and tops of the concrete block foundation walls and piers to block moisture moving up through the concrete, while foil-faced R-13 insulation lines the inside surface of the exterior walls.
A second layer of rigid insulation is installed over the 2 in. by 4 in. retaining strip
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
A thick vapor barrier and radon vent pipe keep soil gases out of the home.
Advanced framing details include corners that are constructed with fewer studs or studs aligned so that insulation can be installed in the corner.
Advanced framing details include framing aligned to allow for insulation at interior-exterior wall intersections.
Advanced framing details include insulated headers over windows and doors.
Advanced framing details throughout house including insulated and open headers
Advanced framing showing open headers
Advanced framing techniques including 2x6 walls spaced at 24 inches on center and ladder blocking at wall intersections allow more space for insulation in the wall cavities while open-web floor joists provide space between floors for ducting.
After attaching netting to the 2x6 studs, workers fill the wall cavities with R-23 of blown fiberglass made from recycled bottles.
After securing the inner coil, cover the draw band and the seam with a generous amount of mastic
After setting precast concrete basement walls on an 8-inch bed of trap rock, this builder sprayed 2 inches of closed-cell spray foam directly onto the ground then laid piping for radiant floor heating before pouring the concrete floor slab.
After spraying the 2x6 wall cavities with 2 inches (R-13) of closed-cell spray foam, the walls are covered with netting and an additional 3.5 inches of fiberglass (R-13) is blown in.
Air seal and insulate drawer and closet boxes in attic kneewalls
Air seal and insulate flex ducts
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
All ceiling, wall, floor, and slab insulation shall achieve RESNET-defined Grade I installation
All other supply ducts and all return ducts in unconditioned space have insulation ≥ R-6
Assembled section of fiber board duct
Attach the interior 2x4 wall to the exterior wall top plate with a flat metal connector plate
Attic knee walls are insulated with rigid foam and sealed with spray foam to help form a continuous draft barrier around attic rooms.
Autoclaved aerated concrete consists of sand, cement, and water, plus aluminum powder that reacts with the cement to form tiny bubbles that double the volume of the concrete, which then hardens to a lightweight, insulating product.
Baffles above the raised heel trusses and wind dams behind the trusses will keep wind from blowing the cellulose insulation away from the eaves.
Baffles are installed to protect airflow from the soffits to the ridge vents before the ceiling drywall and attic insulation are installed.
Baffles will keep insulation out of the soffit vents and wind out of the insulation in this vented attic.
Basement slab w/ capillary break
Batt insulation should be cut to fit around wiring so that insulation can completely fill the wall cavity
Batt was properly split around wires to achieve RESNET Grade I
Because this ICF and spray foamed house is so well insulated, the HVAC system is smaller, the round metal ducts are smaller diameter, and the duct layout is more compact.
Between the ICF foundation walls, the builder sprayed closed-cell spray foam directly onto the gravel base to provide a vapor barrier and continuous layer of insulation under the slab.
Blown cellulose insulation completely fills the netted wall and ceiling cavities
Blown fiberglass insulation fills netted wall cavities
Boot has been covered with insulation and sealed with mastic
Boot is uninsulated
Capillary break at all crawlspace floors using ≥ 6 mil polyethylene sheeting, lapped 6-12 in., and lapped up each wall or pier and fastened with furring strips or equivalent
Ceiling, wall, floor, and slab insulation levels shall meet or exceed Builders Challenge levels
Cellulose insulation is sprayed into wall cavities.
Collars that are specifically made for flexible duct have a raised bead to prevent the duct from slipping off
Concrete is poured into the rigid foam shell of the insulated concrete form (IC¬¬¬¬¬¬¬F) walls; a plastic water barrier has already been installed to protect the below-grade wall surfaces.
Connector plate and drywall clips
Construct a double wall consisting of two framed walls forming a wide wall cavity for more insulation in the home’s exterior walls.
Conventional T-post framing detail
Conventional three-stud corners leave a cavity that must be insulated by the framers—not good
Cut fiber board with a red V-groove tool and a gray shiplap tool to create mitered corners and a shiplapped edge for duct sections
Dense-packed blown fiberglass insulation completely fills the wall cavities with no gaps or voids.
Design the roof with raised heel trusses to allow full insulation over the top plates of the exterior walls.
Drywall was removed and the existing 2x4 walls were filled with 3.5 inches of dense-packed cellulose. Outside, the ½-inch plywood was topped with house wrap, 1.5 inches closed-cell rigid foam, 1x3 furring strips, and fiber cement siding.
Duct insulation is installed over boot
Duct is located in unconditioned space and is not insulated
Duct is located in unconditioned space and is properly insulated
Duct work is uninsulated and not sealed at seams
Ducts are insulated but strapping is compressing the insulation therefore reducing the R-value
Ducts are properly insulated and supported without compressing the insulation
Easy access
Example of an HVAC installer’s balancing report form

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