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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.
Air seal the floor above a garage when there is living space above the garage and make sure floor insulation is in full contact with the underside of the subfloor.
Air seal the floor above an unconditioned basement or crawlspace and make sure floor insulation is in full contact with the underside of the subfloor.
Air seal the top, bottom, and sides of a cantilevered floor cavity and ensure that insulation is in full contact with all sides without voids.
All seams are caulked to completely air seal the subfloor of the cantilever
Batt insulation is not an effective air barrier
Cantilever floor with insulation and air blocking
Correctly insulated floor
Cover bottom of cantilever area with rigid foam insulation
Cover rigid foam with siding or with 3/8-inch exterior plywood
Do not install carpet in areas that are likely to get wet, such as bathrooms, kitchens, entry ways, or laundry rooms.
Effective air barrier for the rim joist
Fill the joist bays with fiberglass batt orspray foam
Fill the joist bays with fiberglass batt or spray foam
Filler blocking
ICF foundation walls wrap the floor slab in R-22 of insulation while the entire space under the slab is covered with 4.3 inches of closed-cell spray foam.
In cold climates, plumbing pipes should not be located in the building cavities over the garage
Infiltration through band joist
Infrared image of a rim joist
Install rigid insulation and finish material below the framing and cavity insulation of a building overhang
Insulation not aligned with subfloor or joists
Insulation support
Misaligned floor insulation
Mold on wall, baseboard, and carpet
Penetrations through subfloor air sealed
Right – Air barrier is present and installed between the floor system and unconditioned space
Right – All holes, gaps, and seams of the rigid air barrier are air sealed
Right – Cantilever has been properly insulated, air sealed, and cavity has been blocked
Right – Floor above garage is a continuous air barrier
Right – Insulation is in contact with floor above
Right – Penetrations through the floor are air sealed
Right – Sub-floor insulation is properly installed and supported
Right – There is no carpet installed in the bathroom
Right – There is no carpet installed in the bathroom
Right-- IR photo shows how effectively spray foam insulated/air sealed attic kneewall and the floor cavities under kneewall
Rigid foam and caulk are used to seal each joist bay cavity
Sealed blocking
Select flooring appropriate for wet areas
Spray foam at band
Spray foam insulation air seals and insulates the floor above the garage.
Spray foam over the garage
Subfloor as air barrier
The ducts are located within the conditioned space of the home in open-web joists between the floors and the ducts are properly supported to prevent sagging.
The floor cavities under this attic kneewall are completely open to the unconditioned attic space and a prime target for wind washing.
The HVAC ducts are located between floors in conditioned space, protecting them from cold attic conditions.
The HVAC system’s rigid metal ducting is installed between the floor joists rather than in an unconditioned attic or crawl space to minimize heat loss in winter and heat gain in summer.
The open-web roof and floor joists, laminated beams, and I-beams reduce raw lumber use and increase load-bearing capacity, while resisting shrinking, twisting, splitting, and warping.
Thermal mass stained concrete slab absorb solar heat during the day and release it into the rooms at night.
These floor joist bays have been properly air sealed with caulked rigid foam insulation
Thick beads of caulk will form a continuous seal between the subfloor and the wall’s bottom plate to keep out air and bugs.
This home is heated with in-floor hydronic radiant heating tubes that were installed on top of the R-20 rigid foam under-slab insulation.
Wrong – Cantilever is not blocked or insulated
Wrong – Floor system does not have air barrier to seperate it from garage
Wrong – Insulation is misaligned with floor above
Wrong – No air barrier is present between cantilever and conditioned space
Wrong – No air barrier is present between the floor system and unconditioned space
Wrong – Penetration through the floor is not air sealed
Wrong – Sub-floor insulation has gaps, compression, and misalignment
Wrong – Sub-floor insulation is not properly installed or supported
Wrong – There is carpet installed too close to the plumbing fixtures in the bathroom
Wrong – There is carpet installed too close to the plumbing fixtures in the bathroom