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Boot has been covered with insulation and sealed with mastic
Boot is uninsulated
Boot to drywall connection not sealed
Boot to drywall connection sealed
Boot to floor connection not sealed
Boot to floor connection sealed
Brick veneer rain-screen assembly
Build an air-tight rigid box to cover the exhaust fan
Building cavities not used as supply or return ducts unless they meet Items 3.2, 3.3, 4.1, and 4.2 of this Checklist
Building materials have signs of water damage and high moisture content
Cantilever floor with insulation and air blocking
Cap nail securing a weather-resistant barrier
Capillary break at all crawlspace floors using > 6 mil polyethylene sheeting, lapped 6-12 in., and secured in the ground at the perimeter using stakes
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
Capillary break at all crawlspace floors using ≥ 6 mil polyethylene sheeting, lapped 6-12 in., and placed beneath a concrete slab
Capillary break beneath all slabs (e.g., slab on grade, basement slab) except crawlspace slabs using either: ≥ 6 mil polyethylene sheeting lapped 6-12 in., or ≥ 1 in. extruded polystyrene insulation with taped joints
Catchment system
Caulk air seals the boot to the ceiling
Caulk applied against the backer rod to seal a window rough opening
Caulk around each piece of rigid foam in garage wall rim joist cavities
Caulk electrical boxes mounted in the ceiling
Caulk holes in the electrical box, caulk the wire holes, and caulk the face of the box to the drywall
Caulk or foam seal between the exhaust fan housing and the ceiling gypsum; install a gasket or caulk around the exterior exhaust duct vent
Caulk or glue along top plates before installing drywall
Caulk the drywall to the spacer board behind the stringer board
Caulk top and sides of window
Cavity used for return is not insulated and is not air sealed, which will pull in air from outside
Cavity was not air sealed
Ceiling opening for chimney chase
Ceiling opening for chimney pipe chase
Ceiling, wall, floor, and slab insulation levels shall meet or exceed Builders Challenge levels
Cement board installed to a shower surround
Cement board installed to a tub surround
Central-fan-integrated supply ventilation with exhaust fans for intermittently balanced whole-house ventilation
CFM rating may not meet the performance specification once installed
CFM rating may not meet the performance specification once installed
Check the moisture content of wall materials to ensure materials are dry before enclosing walls with drywall and siding.
Choose high-performance ENERGY STAR-rated windows.
Closed-cell backer rod for air sealing window and door rough openings
Clothes dryers vented directly to outdoors, except for ventless dryers equipped with a condensate drain
Collage showing air leak in existing porch wall with no air barrier and how air barrier was installed
Collars that are specifically made for flexible duct have a raised bead to prevent the duct from slipping off
Common exhaust duct not shared by fans in separate dwellings
Common wall sheathing not properly fastened or sealed
Common window water infiltration pathways
Compact duct design layout
Example of a compact duct layout showing a centrally located furnace (FAU)
Complete water management strategy for a below-grade wall
Comprehensive water management features include a capillary break (≥ 6-mil polyethylene sheeting) at all crawlspace floors
Concrete slab over polyethylene sheeting as capillary break
Concrete slab pan flashing for doors
Condensation potential for exterior storm retrofits
Condensation potential for interior storm retrofits
ENERGY STAR-certified clothes washers save energy and money for consumers
Connection in place but not sealed
Connector plate and drywall clips
Consider using a metal duct elbow instead of flex duct at boot connections to prevent compressions
Construct a double wall consisting of two framed walls forming a wide wall cavity for more insulation in the home’s exterior walls.
Construct exterior walls with insulated concrete forms (ICFs) that provide insulation without thermal bridging, as well as air sealing, a drainage plane, and high structural strength.

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